Bibliografie tematiche / Granite soils

Letteratura scientifica selezionata sul tema "Granite soils"

Autore: Grafiati
Pubblicato: 25 luglio 2024
Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Granite soils"

1

Owonubi, Ayodele. "Assessment of Chemical Properties of Soils Derived from Basement Complex Rocks of the Jos Plateau". UMYU Scientifica 1, n. 2 (30 dicembre 2022): 53–60. http://dx.doi.org/10.56919/usci.1222.007.

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Abstract (sommario):
Information on the chemical characteristics of soils is required in the sustainable the management of soil fertility and productivity. The objective of this study was to determine chemical characteristics of basement complex derived soils of the Jos Plateau. Soil study followed the approach in the Soil Survey manual and began by identification of three geologic units: granite gneiss, biotite granite and migmatite. Furthermore, eighteen soil profile pits were dug in each geologic units and eighty-four samples were taken from genetic horizons. Standard laboratory procedures were used to analyze soil samples for pH, organic matter, nitrogen and phosphorus. Results showed that organic matter contents in the soils were generally low and seemed to influence the distribution of nitrogen in the soils. Consequently, contents of total nitrogen were low. Mean contents of pH in the A horizon were 5.15, 4.64 and 5.58 respectively for soils derived from granite gneiss, biotite granite and migmatite. Low pH levels are linked to the basic cations draining out of the profile and the acidic character of the basement complex rocks from which the soils were formed. Soil reaction in most cases indicated that soils had a net negative charge. Available P contents in the magmatic soils was significantly higher than those of other geologic units. Effects of granite gneiss, biotite granite and migmatite parent materials on variation in soil chemical properties were more noticeable for soil reaction and available P contents.
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2

Eltwati, Ahmed, Alaa Elkaseh, Fares Tarhuni e Saleh Ahmeed Buagela. "POTENTIAL OF GRANITE DUST TO IMPROVE THE ENGINEERING PROPERTIES OF SOFT SOILS FOR ROAD CONSTRUCTION". Science Proceedings Series 2, n. 1 (25 aprile 2020): 55–61. http://dx.doi.org/10.31580/sps.v2i1.1254.

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Soft soils such as clay soils, mostly if they comprise swelling minerals may produce great damage to structures, particularly when these soils are exposed to wetting and drying situations. The geotechnical properties of soft soils could be enhanced by utilizing chemical additives. In this paper, granite waste dust was used to adjust the properties of clay soils. This paper investigates the effect of granite rock dust on the geotechnical properties of soft soil. The particle size distribution, Atterberg limits, compaction, California bearing ratio (CBR) and direct shear strength characteristics of the soil when blended with various percentages of granite dust were evaluated. The findings show a great increase in the maximum dry density, optimum water content, direct shear strength and CBR with increasing the amount of granite dust. The best results obtained for CBR values were when the soils mixed with 8% granite dust. Although these findings indicate great improvement in the geotechnical parameters of clayey soils, the higher strength established is not enough for the enhanced soil to be utilized as a base material in the construction of heavily-trafficked flexible pavements. However, this modified material can be used as a base material for moderate traffic roads and as a sub-base material for high traffic roads.
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3

Orewere, Emmamoge, e Ayodele Owonubi. "Assessment of Micronutrient Status in Soils Derived from Three Parent Materials on the Jos Plateau, Nigeria". UMYU Scientifica 1, n. 1 (30 settembre 2022): 84–90. http://dx.doi.org/10.56919/usci.1122.012.

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Abstract (sommario):
Parent materials play significant roles in determining the resultant characteristics of various soils. However, not much information is available on their micronutrient status of soil of the Jos Plateau. Hence, the objective of this study was to assess plant available Cu, Zn, Mn and B in soils derived from migmatite, granite gneiss and biotite granite parent materials on the Jos Plateau. Seven profile pits were dug in each geologic unit and soil samples obtained using guidelines in the soil survey manual. Available Cu, Zn, and Mn in soil samples were determined using the 0.1 M HCl extraction method and data collected was subjected to one-way analysis of variance. The results indicated that there were significantly higher contents of available Cu in the A horizon for soil derived from migmatite than in those over biotite granite or granite gneiss. Mean available Cu contents in the A horizon were 1.61 (± 0.35), 1.7125 (± 0.96), and 3.33 mg/kg (± 0.16) for granite gneiss, biotite granite and migmatite respectively; whereas for the B horizon mean contents were 2.06 (± 0.40), 2.98 (± 1.31), and 4.13 mg/kg (± 1.93) for granite gneiss, biotite granite and migmatite respectively. Generally, there were no significant differences in distribution of Mn, Zn and B among the geologic units. Implying that soils derived from migmatite, granite gneiss and biotite granite seems to behave similarly in contents of available Cu, Mn, Zn and B. Also, soil particle size had a significant moderate relationship with Cu and may influence its distribution in these soils.
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4

Owonubi, Ayodele. "Pedogenic Forms of Iron in Soils Developed from Four Parent Materials". JOURNAL OF TROPICAL SOILS 25, n. 1 (22 gennaio 2020): 47. http://dx.doi.org/10.5400/jts.2020.v25i1.47-52.

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Information on the distribution of various forms of iron in soils are valuable in the study of soil genesis. The objective of this study was to to evaluate the pedogenic forms of iron in soils developed over basement complex and basaltic parent materials of the study area. Geologic units considered in the basement complex area were granite gneiss, biotite granite and migmatite. Stratified random sampling formed the basis for field work. Soil sampling was carried out by digging at least two soil profile pits in each geologic unit. Organically bound, amourphous and total iron oxides were estimated using 0.1 M sodium pyrophosphate, acidified (pH 3) ammonium oxalate, and dithionite-citrate-bicarbonate method, respectively. The total Fe in the soil samples were determined after a mixed acid digestion. In general, total iron fractions were statistically similar among the soils of basement complex geologic units but significantly lower than those of soils derived from basaltic rocks. However, the distribution of iron oxide fractions was similar among the basement and basaltic geologic units. Furthermore, there were significant differences in the distribution of iron oxides in the B horizons of basement complex derived soils. Consequently, the quantity of iron oxides in the B horizon was in the order migmatite > biotite granite > granite gneiss. About 70% of total iron oxides in the soils over granite gneiss, biotite granite and basaltic rocks was amorphous in nature. Furthermore, total iron oxides constitute less than 20% of total clay both in the basement complex and basaltic soils.
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5

Amulya, Gudla, Arif Ali Baig Moghal e Abdullah Almajed. "A State-of-the-Art Review on Suitability of Granite Dust as a Sustainable Additive for Geotechnical Applications". Crystals 11, n. 12 (7 dicembre 2021): 1526. http://dx.doi.org/10.3390/cryst11121526.

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The increase in infrastructure requirement drives people to use all types of soils, including poor soils. These poor soils, which are weak at construction, must be improved using different techniques. The extinction of natural resources and the increase in cost of available materials require us to think of alternate resources. The usage of industry by-products and related methods for improving the properties of different soils has been studied for several years. Granite dust is an industrial by-product originating from the primary crushing of aggregates. The production of huge quantities of granite dust in the industry causes severe problems from the handling to the disposal stage. Accordingly, in the civil engineering field, the massive utilization of granite dust has been proposed for various applications to resolve these issues. In this context, the present review provides precise and valuable content on granite dust characterization, its effect as a stabilizer on the behavior of different soils, and its interaction mechanisms. The efficacy of the granite dust in replacing sand in concrete is explored followed by its ability to improve the geotechnical characteristics of clays of varying plasticity are explored. The review is even extended to study the effect of binary stabilization on clays with granite dust in the presence of calcium-based binders. The practical limitations encountered and its efficiency over other stabilizers are also assessed. This review is further extended to analyze the effect of the granite dust dosage for various field applications.
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6

Lavanya, Damaraju Lakshmi, Poorna Hanumanth Rao, B. Aishwarya e G. Priyanka. "A Study on Behaviour of Clayey and Silty Soils with Granite Dust". IOP Conference Series: Earth and Environmental Science 1280, n. 1 (1 dicembre 2023): 012039. http://dx.doi.org/10.1088/1755-1315/1280/1/012039.

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Abstract A massive amount of granite dust is produced as a byproduct of processing granite rock. Disposing of granite dust is a fatal to human health and is a environmental toxic for land disposal. An attempt was made to use such a material in construction, decrease the disposing problems. Soil, an important material bearing the load of the resisting structure can be available in various layers beneath the earth. Clayey soil and mixture of silt in soil layers exhibits inadequate load bearing ability and shows significant changes in volume with respect to changes in moisture levels. Stabilization of soil is the process that improves the behavior of soil properties. The study investigates the percentage of granite dust that can be a best stabilizer to silty and clayey soil. A series of laboratory tests were conducted to investigate the effects of granite dust. Artificial soil sample were prepared with 0%, 12%, 16%, 20%and 24% with additive as granite dust on silty and clayey soils. Chemical composition of the granite dust was studied for the application of granite dust as a stabilizer. Comprehensive soil tests like liquid limit, plastic limit, Maximum dry density, swell index, shear strength, CBR were performed. A significant decrease was observed in liquid and plastic limit varying with granite dust for both the soils. The dry density increases with an increase in % of granite dust. Swell index shows a decrease rate with increase in granite dust. The shear strength and CBR values gave appropriate increase conclude that granite dust can acts good soil stabilizer for clayey and silty soils.
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7

Timofeeva, Yulya, e Elena Sukhacheva. "Mining production as a factor of transformation of soils and soil cover". E3S Web of Conferences 265 (2021): 03011. http://dx.doi.org/10.1051/e3sconf/202126503011.

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The article describes the component composition of the soil cover in the areas of mining granite material near Kuznechnoe, Leningrad region. Nonsoils formations take about 50 per cent of the study area. There are natural and varying degrees disturbed soils in this area around excavations of the quarry. Soils with Novic qualifiers are formed along the access roads to the quarry. There are stratified natural soils are diagnosed around the quarry in the direction of the rose diagram. Lithic Leptosol are formed at the crushed granite storage site. The degree of transformation of the component composition of the soil cover depends on anthropogenic activity in the territory adjacent to granite quarry has been defined. The article outlines the characteristics of the altered structure of the soil cover.
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8

Owonubi, Ayodele. "Evaluation of Physical Characteristics of Soils Derived from Basement Complex Rocks of the Jos Plateau". UMYU Scientifica 1, n. 2 (30 dicembre 2022): 39–45. http://dx.doi.org/10.56919/usci.1222.005.

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Abstract (sommario):
The physical characteristics of soils to a large extent influences soil productivity. The objective of this study therefore is to evaluate the physical characteristics of soils derived from basement complex rocks of the Jos Plateau. According to the methodology outlined in the Soil Survey manual, the stratification of the study region into three geologic units—granite gneiss, biotite granite, and migmatite—was the first step in the soil research process. Additionally, soil samples were collected from genetic strata and soil profile pits were dug in each of these geologic units. Following standard procedure soils were analyzed for color, particles size distribution, structure, and bulk density. Results indicated that physical soil characteristics over the geologic units studied were in most cases similar. However significant differences were observed in particle size distribution in the A-horizons. Clay content in the A horizon of these soils generally ranged from a minimum of 8% to a maximum of 28%. Clay content in the A-horizons of the magmatic soils were significantly higher (P<0.05) than soils over granite gneiss but statistically similar (P>0.05) to those of biotite granite. Particle size distribution data indicate that the soils have undergone intensive weathering. Soil structures were on the average moderately developed in the soils studied with angular and sub-angular blocky structures. Although there was evidence of soil compaction to suggest plant root development could be affected or inhibited in these soils. .
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9

Filimonova, Elena, Natalia Lukina, Margarita Glazyrina, Galina Borisova, Tripti, Adarsh Kumar e Maria Maleva. "A comparative study of Epipactis atrorubens in two different forest communities of the Middle Urals, Russia". Journal of Forestry Research 31, n. 6 (9 luglio 2019): 2111–20. http://dx.doi.org/10.1007/s11676-019-01010-y.

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Abstract The objective of this study was to compare eco-physiological and morphological parameters of a regionally endangered orchid species, Epipactis atrorubens (Hoffm. ex Bernh.) Bess., growing in two forest communities (on serpentine and granite outcrops) of the Middle Urals, Russia. Biodiversity, dominance, and phytocoenosis studies showed the colonization of a wide range of plant species on both sites. The physicochemical properties of the soil, chemical composition and morphological features of E. atrorubens, growing under technogenic conditions (asbestos deposits), on serpentine outcrops and in the natural environment of the granite massif were studied for the first time. The serpentine substrate differed from the granite one by its greater stoniness, circumneutral pH and lower contents of available nitrogen and phosphorus. Extremely high concentrations of magnesium were found in the serpentine soil, some 79 times higher than in the granite substrate. High concentrations of nickel (94 times), chromium (59 times), cobalt (17 times), and iron (4 times) were found in the serpentine substrate, higher than in the granite substrate. The differences between the sites for available metal contents and for root and shoot metal contents were significantly less. Concentrations of most of the metals in the roots were higher than in the shoots. Despite higher metal concentrations and lower nitrogen and phosphorus levels in serpentine soils, E. atrorubens had a larger population and greater viability compared to those growing on granite. Plants on serpentine outcrops were characterized by the formation of a larger number of fruits, greater root lengths and thicker leaf blades, compared to plants on granites. The well-developed orchid mycorrhizae contributed to the survival of this species under unfavorable serpentine conditions. Hence, serpentine outcrops formed due to the mining of asbestos could be a suitable substrate for the light-demanding E. atrorubens due to its capacity to adapt to dry, rocky, nutrient-depleted soils and limited competition from other plants.
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10

Asante, Samuel Yaw, Nanine Fouché e Augustine Lawer. "The collapsible nature of reworked residual granites in the Stellenbosch Municipality, South Africa". Journal of the Ghana Institution of Engineering (JGhIE) 24, n. 1 (28 febbraio 2024): 1–6. http://dx.doi.org/10.56049/jghie.v24i1.36.

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Abstract (sommario):
In South Africa, residual granite is associated with the collapse phenomenon, a geotechnical hazard that was first identified in the 1950s. Residual granite is a product of chemical weathering (in-situ decomposition) or physical weathering of the parent rock (granite) whilst reworked residual granites is defined as residual granite reworked in-situ by termites. Residual granite usually consists of bulky-sized quartz particles, with silts, and bridged by colloidal matter. Extreme leaching of the colloidal matter creates a structure like a honeycomb. It, however, leaves voids within the structure, which affects the mechanical behaviour of the soil. The soil collapses upon wetting under additional loading. Construction on soils with a collapsible fabric has led to many documented problems. This paper, therefore, reports on the examination of mineral composition and particle shape examination and its effect on behavioural changes of potentially collapsible soil. The soil used for this study includes reworked residual granite obtained from the Stellenbosch area in the Western Cape of South Africa. A multi-element analysis and morphological studies were performed on mounts using the ZEISS EVO MA15 scanning electron microscope at the Centre for Analytical Facility at Stellenbosch University. Shape analysis confirmed that the severity of collapse increased with increasing angularity. In addition, the type and amount of clay present at particle contacts influenced the swell and collapse behaviour of reworked residual granite.
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Più fonti

Tesi sul tema "Granite soils"

1

Lee, In-Keun. "Mechanical behaviour of compacted decomposed granite soil". Thesis, Online version, 1991. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.292710.

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2

Yan, Wai Man. "Experimental study and constitutive modelling of re-compacted completely decomposed granite /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20YAN.

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Abstract (sommario):
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 168-177). Also available in electronic version. Access restricted to campus users.
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3

Chan, Man Yiu. "The influence of wetting on the dynamic properties of completely decomposed granite in Hong Kong /". View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202002%20CHANM.

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Abstract (sommario):
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002.
Includes bibliographical references (leaves 131-136). Also available in electronic version. Access restricted to campus users.
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4

To, Chiu-yin. "A unified elasto-plastic model for saturated loosely compacted completely decomposed granite". Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/b40203554.

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5

Maribeng, Lebea. "The influence of parent material (granite and schist) on physical and chemical properties of soils on the Syferkuil Experimental Farm". Thesis, University of Limpopo (Turfloop Campus), 2007. http://hdl.handle.net/10386/606.

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Abstract (sommario):
Thesis (M.Sc. (Soil Science)) --University of Limpopo (Turfloop campus), 2007
The influence of parent material on physical and chemical properties of soil was studied on granite and schist derived soils on the Syferkuil Experimental Farm, situated in the Mankweng area of the Limpopo Province of South Africa. A total of 49 samples of virgin soils were collected, where granite soils constituted 26 samples and schist soils 23. The study design that was used is cross-sectional. The samples were analysed for physical and chemical properties. The physical properties of granite and schist soils were determined as percentages coarse sand, percentages medium sand, percentages fine sand, percentages very fine sand, percentages silt and percentages clay, whilst the chemical properties were determined as concentrations (cmol (+) kg-1) of Na, Mg, Ca, K ,ESP, CEC and P (mg kg-1), as well as pH. Statistical analysis of the results was performed by application of the Unpaired Student’s T Test, with the level of significance at p<0.05. The results showed that soils derived from granite had significantly higher coarse and medium sand fractions than schist soils; whereas schist soils were significantly higher in fine sand, very fine sand, silt and clay. The concentrations of Na, Ca, ESP and P, as well as CEC and pH in schist derived soils were higher than in granite derived soils although the differences were insignificant. However, significant differences occurred in K and Mg concentrations where schist derived soils had higher concentrations than granite derived soils. However, the concentrations of nutrient elements were found to be insufficient for proper production in agriculture. The sodium concentration was found to be low enough to not lead to sodic soil conditions. It was concluded that both granite and schist soils can be used for agriculture but require careful management because both soils indicated poor nutritional status.
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6

Gildenhuys, Nanine. "The occurrence and extent of collapse settlement in residual granite in the Stellenbosch area". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5214.

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Abstract (sommario):
Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2010.
ENGLISH ABSTRACT: Large areas of the earth’s surface are covered by soils that are susceptible to large decreases in bulk volume when they become saturated. These soils are termed collapsing soils and are very common in parts of the USA, Asia, South America and Southern Africa. This study is concerned with the occurrence of these collapsible soils in the residual granites of the Stellenbosch area. The study was undertaken as relatively little is known about the collapse phenomenon in the problematic weathered granites of the Western Cape. The majority of research thus far has been carried out on the deep residual soils formed on basement-granite in the Transvaal areas, whereas little attention has been paid to the Cape granites. The aim of the study was achieved through the experimental work which included double oedometer testing, indicator analyses and shear strength testing. Double oedometer tests were performed to quantify the potential collapse settlement of the soils from the demarcated study area. To provide a better understanding of the collapse behaviour of the soils, indicator analysis, which included Atterberg limits and particle size distributions, were performed. Direct shear tests were further carried out on saturated and natural moisture content specimens to establish the effect of collapsibility on shear strength and whether substantial additional settlement of the saturated soils would occur during shear. It was found that collapsible soils are prevalent in the demarcated study area as the majority of soils showed a potential collapse settlement of 1% or more. Collapse exceeding 5% were calculated in a few instances proving some soils to be highly collapsible. The double oedometer and indicator analysis results were used in an attempt to obtain a relationship between collapse settlement and a combination of easily determined properties such as dry density (void ratio), moisture content and grading, but no meaningful conclusions have emerged. The shear strength tests indicated that a clear correlation does not exist between collapsibility and shear strength. It was further established that a relationship between collapse settlement determined during the double oedometer testing and the volume change during shear strength testing cannot be assumed. It can thus be concluded that soils can be very unpredictable and further research on the collapse phenomenon is indicated.
AFRIKAANSE OPSOMMING: Groot dele van die aarde se oppervlakte is bedek deur grondtipes wat geneig is tot ‘n afname in volume as dit deurweek word. Hierdie gronde word swigversakkende gronde genoem en dit word algemeen teëgekom in dele van die VSA, Asië, Suid-Amerika en Suider-Afrika. In hierdie studie word die voorkoms van swigversakkende gronde in die residuele graniet in die Stellenbosch area ondersoek. Die studie is onderneem aangesien relatief min i.v.m. die swigversakking-verskynsel in die problematiese verweerde graniet van die Weskaap bekend is. Die meeste van die navorsing sover is onderneem op die diep residuele gronde wat gevorm is op die Argaïese graniet in die Transvaal gebied, en betreklik min aandag is geskenk aan die Kaapse graniet. Tydens die studie is eksperimente wat dubbele oedometer toetse, indikator analises, en skuifsterkte toetse insluit, uitgevoer. Dubbele oedometer toetse is uitgevoer om die potensiële swigversakking van die grond in die afgebakende studiegebied te kwantifiseer. In ‘n poging om die swigversakking-verskynsel van die grond beter te verstaan, is indikator analises wat Atterberg grense en partikel grootte verspreiding insluit, uitgevoer. Direkte skuiftoetse is ook uitgevoer op deurweekte grondmonsters en op monsters wat natuurlike vog bevat, om sodoende die effek van swigversakking op skuifsterkte vas te stel en om uit te vind of aansienlike addisionele sakking van die deurweekte gronde tydens skuif plaasvind. Daar is gevind dat swigversakkende gronde die oorheersende grondtipe in die afgebakende studiegebied is waar meeste van die gronde ‘n potensiële swigversakking van meer as 1% toon. ‘n Swigversakking van meer as 5% is in ‘n paar gevalle bereken, wat bewys dat sommige grondtipes hoogs versakkend is. Die resultate van die dubbele oedometer en indikator analises is gebruik in ‘n poging om te bewys dat daar ‘n verhouding bestaan tussen swigversakking en ‘n kombinasie van kenmerke wat maklik vasgestel kan word soos droë digdheid (ruimte verhouding), voginhoud en gradering, maar daar kon nie tot ‘n sinvolle slotsom gekom word nie. Die skuifsterkte toetse toon dat daar nie ‘n duidelike korrelasie bestaan tussen swigversakking en skuifsterkte nie. Daar is verder vasgestel dat dit nie moontlik is om te aanvaar dat daar ‘n verhouding bestaan tussen swigversakking soos vasgestel tydens die dubbele oedometer toetsing, en die verandering in volume tydens skuifsterkte toetsing nie. Daar is dus tot die slotsom gekom dat grond baie onvoorspelbaar kan wees en dat verdere navorsing na die swigversakking-verskynsel nodig is.
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To, Chiu-yin, e 杜昭彥. "A unified elasto-plastic model for saturated loosely compacted completely decomposed granite". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40203554.

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8

Agenbach, G. "Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardeberg /". Link to the online version, 2006. http://hdl.handle.net/10019/488.

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9

Agenbach, G. "Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg". Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/3035.

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Abstract (sommario):
Thesis (MScAgric (Soil Science))--University of Stellenbosch, 2006.
High potassium content in grape juice and wine are associated with low quality red wine in warm wine producing countries. In an attempt to reduce the potassium content of juice, must and wine, a field experiment was laid out on the farms Meerlus and Kersfontein in the Paardeberg area near Wellington in 1998 on granite derived soils to investigate the effect of canopy management and fertiliser applications on berry K accumulation and wine quality. Four fertiliser applications, three canopy treatments and a MgSO4 foliar spray were studied. The three fertiliser treatments being: none (control), CaSO4, Ca(OH)2, and MgSO4 applications. The canopy treatments were: thin to two shoots per bearer, tip, vertical shoot positioning (VSP) and the removal of yellow leaves and lateral shoots (canopy 1), thin to three shoots per bearer, top after véraison and VSP (canopy 2) and VSP with top after véraison (canopy 3/control). Magnesium sulfate sprays were applied at véraison for two seasons (1999/00 and 2000/01). Seasonal effects produced the most significant differences in this experiment. Canopy treatments did not affect juice K concentration at harvest. Canopy 1 and 2 produced significantly lower wine pH values at Kersfontein. Fertiliser treatments had no effect on juice K concentration nor did it affect wine quality. Magnesium sulphate foliar sprays did not affect juice K concentration at harvest but significantly lowered juice and wine pH, improved wine colour density and total phenolic content. It appears for this experiment that soil K content before véraison, shoot growth at and after véraison and water stress after véraison were the main factors determining juice K concentration at harvest.
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Shi, Liangyu. "Influence of artificial weak cementation on loose silty sand behavior /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20SHI.

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Abstract (sommario):
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 163-170). Also available in electronic version. Access restricted to campus users.
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Più fonti

Libri sul tema "Granite soils"

1

Dougherty, Brian D. Soil survey of Granite County Area, Montana. [Washington, D.C.?]: Natural Resources Conservation Service, 2003.

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2

Dougherty, Brian D. Soil survey of Granite County Area, Montana. [Washington, D.C.]: The Service, 2003.

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3

Harden, Jennifer W. Soils developed in granitic alluvium near Merced, California. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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4

Ivo, Lucchitta, Coder Christopher, Geological Survey (U.S.) e Quaternary Geology Geomorphology Program (U.S.), a cura di. Quaternary geology of the Granite Park area, Grand Canyon, Arizona: Aggradation-downcutting cycles, calibration of soils stages, and response of fluvial system to volcanic activity. [Menlo Park, CA]: U.S. Geological Survey, 1995.

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Ivo, Lucchitta, e Geological Survey (U.S.), a cura di. Quaternary geology of the Granite Park area, Grand Canyon, Arizona: Aggradation-downcutting cycles, calibration of soils stages, and response of fluvial system to volcanic activity. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Tayfur, Gokmen. Evaluation of erosion potential of bare and vegetated cut/fill slopes of decomposed granite at Buckhorn Summit: Final report. Davis, CA: University of California, Dept. of Civil Engineering, 1995.

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1931-, Davies T. G., a cura di. Community health, preventive medicine and social services. 6a ed. London: Baillière Tindall, 1993.

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Fatchett, Anita. Nursing in the new NHS: Modern, dependable? Edinburgh: Baillière Tindall, 1998.

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1940-, Barr William, Moss Edward L e Arctic Institute of North America., a cura di. Resurrecting Dr. Moss: The life and letters of a Royal Navy surgeon, Edward Lawton Moss MD, RN, 1843-1880. Calgary: University of Calgary Press, 2008.

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Peter, Smith, a cura di. Measuring outcome in the public sector. London: Taylor & Francis, 1996.

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Capitoli di libri sul tema "Granite soils"

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Sousa, J. Almeida e., A. S. Cardoso, M. Matos Fernandes e L. Ribeiro e. Sousa. "Behaviour of a shallow tunnel in granite residual soils". In Applications of Computational Mechanics in Geotechnical Engineering, 243–53. London: Routledge, 2021. http://dx.doi.org/10.1201/9781315137568-10.

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Makiuchi, K., T. Miyamori e S. Iwai. "Effects of particle breakage on mechanical characteristics of decomposed granite soils". In Environmental Geotechnics and Problematic Soils and Rocks, 527–32. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211051-50.

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Wang, Z. Y., J. M. Ling, Z. Y. Bian e L. Man. "Wetting deformation characteristics of granite residual soils and the micro-mechanism". In Green and Intelligent Technologies for Sustainable and Smart Asphalt Pavements, 622–28. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003251125-100.

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Onitsuka, K., e S. Yoshitake. "Influence of initial water content and soaking on compressibility and shear strength of decomposed granite soil". In Environmental Geotechnics and Problematic Soils and Rocks, 545–53. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211051-52.

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Lopes, Márcia Maria Salgado, Rita de Cássia Silva Sant’Ana Alvarenga, Leonardo Gonçalves Pedroti, Beatryz Cardoso Mendes, Fernando de Paula Cardoso e Afonso Rangel Garcez de Azevedo. "Comparison of Performance Between Granite Waste Pigments Based Paints and Soils Pigments Based Paints". In The Minerals, Metals & Materials Series, 485–96. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72484-3_51.

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Stephen, I. "A Study of Rock Weathering with Reference to the Soils of the Malvern Hills Part I. Weathering of Biotitite and Granite". In Selected Papers in Soil Formation and Classification, 311–25. Madison, Wisconsin, USA: Soil Science Society of America, Inc., 2015. http://dx.doi.org/10.2136/sssaspecpub1.c25.

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Chen, Can, Wolfgang O. Eisenhut e Thanh Ngo. "Examination of the Ignition Oven Method Correction Factor for Hot Mix Asphalt with Granite Aggregates". In New Developments in Soil Characterization and Soil Stability, 109–20. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95756-2_11.

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Lee, Sangbeen, Jeongyoun Lee e Jongwon Jung. "Soil–Water Characteristic Curve Analysis of Weathered Granite Soil According to Fine Content". In Lecture Notes in Civil Engineering, 1829–39. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9722-0_124.

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Sato, Kazuo, e Takashi Wakamatsu. "Soil Solution Chemistry in Forests with Granite Bedrock in Japan". In Acid rain 2000, 1001–6. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-007-0810-5_14.

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Jotisankasa, Apiniti, Auckpath Sawangsuriya, Patipat Booncharoenpanich e Suttisak Soralump. "Influence of Kaolin Mixture on Unsaturated Shear Strength of Decomposed Granitic Silty Sand". In Unsaturated Soils: Research and Applications, 385–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31116-1_52.

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Atti di convegni sul tema "Granite soils"

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Kong, Ling-wei, Hossain Md Sayem, Xian-wei Zhang e Song Yin. "Relationship between Electrical Resistivity and Matric Suction of Compacted Granite Residual Soil". In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481707.043.

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Periyasamy, Dhamodharan, T. Gowtham, S. Vedhanarayanan e C. T. Sivakumar. "Experimental study on stabilization of clayey soils using granite dust". In PROCEEDINGS OF INTERNATIONAL CONFERENCE ON ADVANCEMENTS IN CONSTRUCTION MATERIALS (ICACM2023). AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0224968.

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Pecapedra, Luana L., Orlando M. de Oliveira, Rafael A. dos R. Higashi e Fernando A. M. Marinho. "Comparative Analysis of Water Retention Curves of Residual Soils of Gneiss, Granite and Diabase, Compacted under Optimum Moisture Conditions". In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481707.038.

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Oda, Kazuhiro, Shin-ichi Ito e Keigo Koizumi. "Method on Identification of Infiltration Characteristics of Unsaturated Decomposed Granite Soils". In Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019). Singapore: Research Publishing Services, 2019. http://dx.doi.org/10.3850/978-981-11-2725-0-is7-5-cd.

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Ayadat, T. "Stabilization of a swelling soil using three different chemical additives". In Advanced Topics in Mechanics of Materials, Structures and Construction. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902592-51.

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Abstract. An expansive soil expands when water is added, and shrinks when it dries out. On construction sites, expansive soils can pose geotechnical engineering challenges. More financial loss is caused by expansive soil damage than by floods, hurricanes, tornadoes, and earthquakes combined. The aim of this study is to analyze the effect of stabilization of an expansive soil using three different chemical additives, in this case: white cement and nano-silica as admixture, waste granite dust, and a new liquid polymer soil stabilizer (i.e. liquid granite). This study investigated the effect of these stabilizing agents on the variation of soil consistency, linear shrinkage, and soil swelling behaviour. Three groups of tests were carried out as part of the experimental program. As part of the first group, tests were performed on expansive soil reinforced with 2%, 4%, 8%, and 10% of white cement combined with 2% of nano-silica. Another group of tests consisted of samples mixed with different percentages of granite powder (5%, 10%, 15%, and 20%). In the third group, liquid granite as a soil stabilizer was blended with soil specimens at various concentrations (1%, 2%, 3%, and 4%). For all admixtures, the results showed a marked improvement in soil consistency, an important decrease in linear shrinkage, and a considerable reduction on the expansion index. Compared with the original bentonite clay, the swelling behaviour (expansion index) was reduced considerably by adding these three different chemical additives. Moreover, a correlation between the expansion index and the dosage of the different stabilizers was proposed.
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Liang, Han, Zhang Wengang, Wu Chongzhi e Goh ATC. "Variability of Mechanical and Physical Properties of Singapore Bukit Timah Granite Rocks and Residual Soils". In Proceedings of the 6th International Symposium on Reliability Engineering and Risk Management. Singapore: Research Publishing Services, 2018. http://dx.doi.org/10.3850/978-981-11-2726-7_ctc304s2gdd07.

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Ju, YeoJin, Dugin Kaown, Kang-Kun Lee, Ji-Hun Ryu e Dong-Chan Koh. "high level of radioactivity in shallow granite aquifer: radiogenic He as a proxy of strong in-situ supply from residual soils". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9596.

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Loganayagan, S. "Experimental Study on Practice of Cement Treated Subbase (CTSB) Layer in Flexible Pavement of National Highways in India". In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-5.

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Abstract. Due to the large number of infrastructure projects taking place in rural and urban areas there has been a shortage of building materials. The road industry is looking at ways to improve low-quality materials that are easily accessible for use in road construction. Cement / lime treatment has become an acceptable way to increase soil strength and consistency with moderate proportions, to reduce the number of compounds. The Indian roads congress (IRC) has developed a special edition for the mixed construction of the base / ground floor. There is no design guide currently available for the under the cement base. To overcome this problem, the aim of the current project is to create a chart of the paved area using concrete and limestone on rural and urban roads with small and medium vehicles. It not only saves money but also helps to increase the life cycle of roads. At the base of the road, there are different soils or granite materials available for construction, but they may indicate insufficient structures and lead to significant road stress and reduced life. However, the addition of a stabilizing agent such as cement, asphalt, lime or other non-traditional materials can improve soil properties. Among these various stable materials, cemented materials improve strength and high strength, and demonstrate the excellent performance of the paved system and high durability. Solid foundations can provide inexpensive solutions to many common designs and building conditions. Cement Treated Sub Base (CTSB) is a common method used on road foundations to improve its engineering properties due to the durability of cement where moisture is present and extends the healing time. The bonded base material provides additional strength and support without increasing the overall thickness of the mortar layers. Depending on the needs of the project, CTB increases construction speed, improves the capacity of the pavement structure, or in some cases reduces the full-time project. In addition, a strong foundation reduces deviation due to heavy traffic loads, thereby extending the life of the pavement. CTB base thickness is reduced due to higher carrying capacity compared to granular base thickness.
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Martin, T., C. Trela, T. Kind, M. Gil e J. Wöstmann. "Detection of granite landmarks in soil with GPR". In 2010 13th International Conference on Ground Penetrating Radar (GPR 2010). IEEE, 2010. http://dx.doi.org/10.1109/icgpr.2010.5550179.

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Jeong, Jinseob, Byungsun Kang, Kwangchan Lee e Jaehyouk Yang. "Shear Strength Properties of Decomposed Granite Soil in Korea". In Eighth International Conference on Computing in Civil and Building Engineering (ICCCBE-VIII). Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40513(279)191.

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Rapporti di organizzazioni sul tema "Granite soils"

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Савосько, Василь Миколайович, Юлія Бєлик e Юрій Васильович Лихолат. Ecological and Geological Determination of the Initial Pedogenesis on Devastated Lands in the Kryvyi Rih Iron Mining & Metallurgical District (Ukraine). Journ. Geol. Geograph. Geoecology, 2019. http://dx.doi.org/10.31812/123456789/3643.

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In our time, a very urgent problem is the cessation of negative impacts on the environment and the return to the practical use of the territories of devastated lands. In this regard, it is important to find out the basic laws of primary soil formation in the area of these man-made neoplasms. The initial soil formation conditions were analyzed on 19 experimental sites which represent the main varieties of devastated land in the Kryvyi Rih Iron Mining and Metallurgical District (Central Ukraine): (i) waste rock dumps of old iron mines (old name “Forges”), (ii) tailing storage facility of underground iron mines, (iii) waste rock dumps of the Iron Ore Mining and Dressing Plant, (iv) waste rock dumps of the Granite Quarry Plant. It was established that on the devastated lands in Kryvyi Rih District, the initial soil formation occurs in very difficult conditions. Therefore, over 25- 100 years only very primitive soils were formed. The following features are inherent to them: (1) primitive soil profile (thickness 10-100 mm), (2) low levels of soil organic substance content (9.5-11.5 %), (3) alkaline indicators of the soil solution (pHH2O – 8.08-8.92, pHKCl – 7.42-8.23), (4) low levels of cation exchange capacity (6.34-8.47 mMol /100 g). By results of correlation calculations, among the factors of soil formation time (duration of soil formation) and input of plant ash elements’ fall are characterized by the maximum number of statistically significant correlation coefficients and their numerical values. In terms of chemical composition of the technosol, the values of organic matter content and exchangeable acidity (pHKCl) were the most predictable soil formation factors. Generally physical / chemical characteristics of geological rocks (as parent material) and time were the two most important factors in determining the initial pedogenesis on devastated lands in the Kryvyi Rih Iron Mining & Metallurgical District (Ukraine).
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Borgman, Erin, e Jason Smith. Grant-Kohrs Ranch National Historic Site vegetation composition, structure, and soils: 2009–2019 status and trend. National Park Service, maggio 2022. http://dx.doi.org/10.36967/nrr-2293402.

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Egbert Schwartz. Final Report for DOE grant no. DE-FG02-04ER63883: Can soil genomics predict the impact of precipitation on nitrous oxide flux from soil. Office of Scientific and Technical Information (OSTI), dicembre 2008. http://dx.doi.org/10.2172/944079.

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Rawinski, John J., e Deborah S. Page-Dumroese. Soil compaction monitoring of the Pool Timber Sale, Rio Grande National Forest, Colorado, 16 years after logging. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2008. http://dx.doi.org/10.2737/rmrs-gtr-215.

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Fresquez, P. R., W. R. Velasquez e L. Jr Naranjo. Effects of the Cerro Grande Fire (Smoke and Fallout Ash) on Soil Chemical Properties Within and Around Los Alamos National Laboratory. Office of Scientific and Technical Information (OSTI), novembre 2000. http://dx.doi.org/10.2172/775835.

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Robock, Alan. Final report, DOE grant DE-FG02-93ER61691.A000. Validation of soil moisture in GCMs--AMIP diagnostic subproject 11, September 1, 1993 - August 31, 1998. Office of Scientific and Technical Information (OSTI), maggio 1999. http://dx.doi.org/10.2172/765962.

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Walker, David, e Jeffrey Renfrow. Toxicological reconnaissance of Arsenal? use along the Rio Grande River through Big Bend National Park: Final report. National Park Service, 2024. http://dx.doi.org/10.36967/2302769.

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This study examined the biological response of aquatic organisms, collected in situ and from laboratory toxicity testing of water and soil to the herbicide Arsenal? primarily used to decrease the invasive species Arundo donax in the Rio Grande River through Big Bend National Park in Texas (USA). Biological, toxicological, physicochemical, and flow data were collected before, during, and after an Arsenal? treatment from 4 reference and 3 treatment sites. Significant differences existed in ecoregion 24 B-IBI scoring, and in toxicity testing of water and sediment, between treatment and reference sites. Greater toxicity, and a higher inverse relationship to B-IBI scoring, was observed in sediment samples compared to water samples. This could be due to the surfactant nonylphenol ethoxylate (NPE), added to the Arsenal? formulation rather than the active ingredient imazapyr. Care must be implemented with the results of this research due to many confounding variables that occurred during the study period including flash flooding. Although flashy hydrology is relatively common to the region, it can influence aquatic macroinvertebrate assemblage structure, function, and species richness measures with these dropping due to scour and downstream displacement within a reach during, and for some period following, flooding. Therefore, flash flooding would be expected to have some effect on aquatic macroinvertebrate assemblages and subsequent B-IBI scoring. Additionally, flooding will cause some displacement, and deposition, of sediment throughout the study area. This flooding could impact the sediment toxicity results as sediment-bound contaminants could be spread some distance from their origin. Arsenal? treatment occurred during this study near sites Treatment 1 and Treatment 2 on 5/29 and 5/31 2022 respectively. This represented an extreme condition as far as concentration of potential toxicants in the water are concerned and these relatively high concentrations would be expected to have decreased within a relatively short period of time, especially in the water. It was outside of the scope and budget of this project to obtain concentrations of imazapyr or surfactants from sediment or water. Therefore, exact doses of imazapyr or surfactant for response curves could not be obtained. No sample site exists in isolation rather, influences from one reach can significantly impact downstream areas. This is especially true for aquatic ecosystems in arid regions that often exhibit flashy hydrology. However, we believe the findings from this study provide indication of potential toxicity of some magnitude as well as provide direction for management. Decisions of whether the toxic effects of herbicide use to aquatic macroinvertebrates outweigh the beneficial effects of Arundo donax control should be carefully considered.
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Jones, Scott B., Shmuel P. Friedman e Gregory Communar. Novel streaming potential and thermal sensor techniques for monitoring water and nutrient fluxes in the vadose zone. United States Department of Agriculture, gennaio 2011. http://dx.doi.org/10.32747/2011.7597910.bard.

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The “Novel streaming potential (SP) and thermal sensor techniques for monitoring water and nutrient fluxes in the vadose zone” project ended Oct. 30, 2015, after an extension to complete travel and intellectual exchange of ideas and sensors. A significant component of this project was the development and testing of the Penta-needle Heat Pulse Probe (PHPP) in addition to testing of the streaming potential concept, both aimed at soil water flux determination. The PHPP was successfully completed and shown to provide soil water flux estimates down to 1 cm day⁻¹ with altered heat input and timing as well as use of larger heater needles. The PHPP was developed by Scott B. Jones at Utah State University with a plan to share sensors with Shmulik P. Friedman, the ARO collaborator. Delays in completion of the PHPP resulted in limited testing at USU and a late delivery of sensors (Sept. 2015) to Dr. Friedman. Two key aspects of the subsurface water flux sensor development that delayed the availability of the PHPP sensors were the addition of integrated electrical conductivity measurements (available in February 2015) and resolution of bugs in the microcontroller firmware (problems resolved in April 2015). Furthermore, testing of the streaming potential method with a wide variety of non-polarizable electrodes at both institutions was not successful as a practical measurement tool for water flux due to numerous sources of interference and the M.S. student in Israel terminated his program prematurely for personal reasons. In spite of these challenges, the project funded several undergraduate students building sensors and several master’s students and postdocs participating in theory and sensor development and testing. Four peer-reviewed journal articles have been published or submitted to date and six oral/poster presentations were also delivered by various authors associated with this project. We intend to continue testing the "new generation" PHPP probes at both USU and at the ARO resulting in several additional publications coming from this follow-on research. Furthermore, Jones is presently awaiting word on an internal grant application for commercialization of the PHPP at USU.
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Løvschal, Mette, Havananda Ombashi, Marianne Høyem Andreasen, Bo Ejstrud, Renée Enevikd, Astrid Jensen, Mette Klingenberg, Søren Munch Kristiansen e Nina Helt Nielsen. The Protected Burial Mound ‘Store Vejlhøj’, Vinderup, Denmark: First Results. Det Kgl. Bibliotek, 2023. http://dx.doi.org/10.7146/aulsps-e.479.

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An archaeological excavation of the protected burial mound Store Vejlhøj in northwestern Denmark was carried out in October-November 2021. The excavation formed part of the ERC-funded research project called ANTHEA, focusing on the deep history of anthropogenic heathlands. It was conducted by Aarhus University in collaboration with Holstebro Museum and Moesgaard Museum. The aim was to test a new method of sampling pollen data from different construction stages in a burial mound and comparing them with pollen data from nearby lake sediments with a view to improving our understanding of prehistoric anthropogenic heathland dynamics. Prior to the excavation, soil cores were collected from two nearby peat sediments as well as six burial mounds (including Store Vejlhøj) within a 1 km range of Lake Skånsø, where previous pollen analyses had been carried out. Based on these preliminary corings, Store Vejlhøj was selected for further archaeological investigation. A dispensation for excavating the protected mound was granted by the Danish Palaces and Culture Agency. The excavation was based on a 5 m long trench through the barrow, moving from its foot inwards. The surface vegetation and 40 cm topsoil were removed by an excavator, after which the remainder of the trench was manually dug in horizontal layers. Observation conditions were good. The excavation revealed a series of well-defined barrow construction stages, as well as unusually wellpreserved turf structures. Only two archaeological finds could be related to the barrow, both of which were later than its initial construction: a secondary urn in the top layer, and the base of a second urn at the foot of the mound. The burial mound was constructed using a minimum of three shells, which could be observed in the trench profile. Turfs were most probably collected locally in a landscape dominated by grass pastures, where no previous turf cutting had taken place. A total of 34 soil samples were collected for paleoecological analyses (pollen, Non-Pollen Polymorphs (NPPs), macrofossils) and geoarchaeological analyses (micromorphology, bulk samples). Preliminary pollen and macrofossil results from the burial mound revealed poor preservation conditions, which prompted a trench extension of 0.5 m by 0.2 m to find better preservation conditions. This extension resulted in the collection of a single final macrofossil sample, although there was no identifiable change in the in-situ preservation conditions. The dating results of the mound have not yet been completed and will be included as appendix 4-6 in 2023.
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Cohen, Roni, Kevin Crosby, Menahem Edelstein, John Jifon, Beny Aloni, Nurit Katzir, Haim Nerson e Daniel Leskovar. Grafting as a strategy for disease and stress management in muskmelon production. United States Department of Agriculture, gennaio 2004. http://dx.doi.org/10.32747/2004.7613874.bard.

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The overall objective of this research was to elucidate the horticultural, pathological, physiological and molecular factors impacting melon varieties (scion) grafted onto M. cannonballus resistant melon and squash rootstocks. Specific objectives were- to compare the performance of resistant melon germplasm (grafted and non-grafted) when exposed to M. cannoballus in the Lower Rio Grande valley and the Wintergarden, Texas, and in the Arava valley, Israel; to address inter-species relationships between a Monosporascus resistant melon rootstock and susceptible melon scions in terms of fruit-set, fruit quality and yield; to study the factors which determine the compatibility between the rootstock and the scion in melon; to compare the responses of graft unions of differing compatibilities under disease stress, high temperatures, deficit irrigation, and salinity stress; and to investigate the effect of rootstock on stress related gene expression in the scion. Some revisions were- to include watermelon in the Texas investigations since it is much more economically important to the state, and also to evaluate additional vine decline pathogens Didymella bryoniae and Macrophomina phaseolina. Current strategies for managing vine decline rely heavily on soil fumigation with methyl bromide, but restrictions on its use have increased the need for alternative management strategies. Grafting of commercial melon varieties onto resistant rootstocks with vigorous root systems is an alternative to methyl bromide for Monosporascus root rot/vine decline (MRR/VD) management in melon production. Extensive selection and breeding has already produced potential melon rootstock lines with vigorous root systems and disease resistance. Melons can also be grafted onto Cucurbita spp., providing nonspecific but efficient protection from a wide range of soil-borne diseases and against some abiotic stresses, but compatibility between the scion and the rootstock can be problematic. During the first year experiments to evaluate resistance to the vine decline pathogens Monosporascus cannonballus, Didymella bryoniae, and Macrophomina phaseolina in melon and squash rootstocks proved the efficacy of these grafted plants in improving yield and quality. Sugars and fruit size were better in grafted versus non-grafted plants in both Texas and Israel. Two melons (1207 and 124104) and one pumpkin, Tetsukabuto, were identified as the best candidate rootstocks in Texas field trials, while in Israel, the pumpkin rootstock RS59 performed best. Additionally, three hybrid melon rootstocks demonstrated excellent resistance to both M. cannonballus and D. bryoniae in inoculated tests, suggesting that further screening for fruit quality and yield should be conducted. Experiments with ABA in Uvalde demonstrated a significant increase in drought stress tolerance and concurrent reduction in transplant shock due to reduced transpiration for ‘Caravelle’ plants. In Israel, auxin was implicated in reducing root development and contributing to increased hydrogen peroxide, which may explain incompatibility reactions with some squash rootstocks. However, trellised plants responded favorably to auxin (NAA) application at the time of fruit development. Gene expression analyses in Israel identified several cDNAs which may code for phloem related proteins, cyclins or other factors which impact the graft compatibility. Manipulation of these genes by transformation or traditional breeding may lead to improved rootstock cultivars. Commercial applications of the new melon rootstocks as well as the ABA and TIBA growth regulators have potential to improve the success of grafted melons in both Israel and Texas. The disease resistance, fruit quality and yield data generated by the field trials will help producers in both locations to decide what rootstock/scion combinations will be best.
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