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Tesi sul tema "Wheat-water requirements"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 21 febbraio 2023

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1

Uddin, Md Nizam. "Effects of genetic variation in glaucousness, number of tillers and plant height on response to water stress in wheat". Thesis, The University of Sydney, 1986. https://hdl.handle.net/2123/28704.

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Studies were conducted to evaluate the effect of glaucousness, number of tillers and plant height on response to water stress using near-isogenic wheat lines under two water regimes. The effect of glaucousness and number of tillers was studied under both field and glasshouse conditions while that of plant height was studied only under field conditions. In addition 28 wheat cultivars were evaluated for epicuticular wax content and its relationship with spectral reflectance. Highly significant differences (1.51 to 2.8 mg/dm2) were found in the amount of epicuticular wax (Ew) among the cultivars. Water stress conditions promoted the development of Ew content significantly. Ew content under control conditions and that under stress conditions were positively correlated (r = 0.85, p <0.01) suggesting that selection for this trait could be practised in either of the environments. Surface reflectance was reduced when the waxy layer from the leaf was removed with chloroform. The reduction for the abaxial surface was twice that for the adaxial surface indicating that the abaxial surface was more waxy than the adaxial one. The mean reduction (both surfaces) termed '5' was positively correlated with the amount of Ew (r = 0.59, p <0.01). The effect of glaucousness was studied using six pairs of nearisogenic lines (four pairs in case of glasshouse experiment). The lines differed significantly in all the characters studied except one. However, significant difference between the mean of glaucous and that of non—glaucous lines was found only for epicuticular wax content and water consumption per g of grain. 0n the average, glaucous lines consumed 4.8% less water per g of grain under well-watered conditions and 17.8% less under stress conditions than the non-glaucous lines.

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2

Clark, Lee J., E. Niel Biggs e Laura Rose. "Wheat Water Requirements and Typical Irrigation Efficiences in the Safford Area". College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/200511.

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3

Norrish, Shane A., University of Western Sydney, of Science Technology and Environment College e School of Environment and Agriculture. "Soil and water interactions controlling wheat crop response to phosphorus fertiliser in north-western New South Wales". THESIS_CSTE_EAG_Norrish_S.xml, 2003. http://handle.uws.edu.au:8081/1959.7/613.

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This thesis examines the response to P fertiliser by wheat crops growing in the vertosol soils of the low rainfall areas of the northern grain zone of eastern Australia. Farmers in this region depend on water accumulated from rainfall over a fallow period and stored in the subsoil to increase wheat grain yield beyond that normally achievable from in-crop rainfall and to decrease the production risks due to rainfall variability. The large variability in stored water, seasonal rainfall and subsoil properties result in extremely varied yield and yield responses to P fertiliser between seasons and between sites. Finally, as a practical guide to predicting wheat response to P fertilizer: 1/. current sampling strategies of determining P only in the surface 10 cm appear to be adequate for soils with bicarbonate P concentrations greater than 15 mg/kg. 2/. For soils with lower concentrations in the surface, sampling of 80 cm is recommended. Crops with a mean concentration of bicarbonate P greater than 7 mg/kg between 10 - 80 cm are unlikely to respond to P fertiliser. 3/. No increase in profitable grain yield response was found for fertiliser applications greater than 10 kg P/ha.
Doctor of Philosophy (PhD)

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4

Sarvestani, Zeinolabedin Tahmasebi. "Water stress and remobilization of dry matter and nitrogen in wheat and barley genotypes /". Title page, table of contents and summary only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phs251.pdf.

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5

French, Robert John. "Leaf senescence and water stress in wheat seedlings /". Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phf875.pdf.

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6

Doerge, Thomas, Tim Knowles, Mike Ottman e Lee Clark. "Predicting the Nitrogen Requirements of Irrigated Durum Wheat in Graham County Using Soil and Nitrate Analysis". College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/203767.

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The high yielding spring wheats grown in Arizona usually require applications of fertilizer nitrogen (N) to achieve optimum grain yields and acceptable quality. The University of Arizona's currently recommended procedure (preplant soil plus periodic stem tissue analysis for NO₃-N to predict the N needs of wheat) is not widely used by Graham County growers for various reasons. A nitrogen fertility trial was conducted at the Safford Agricultural Center during the 1986-87 crop year to: 1) examine the relationships between basal stem nitrate-N levels, grain yields of durum wheat, and N fertilizer rates; and 2) to test the accuracy of the recommended procedure for predicting the N needs of durum wheat. Five rates of N from O to 419 lbs N /acre were applied in three split applications. One additional N treatment was made as indicated by the current University of Arizona procedure. Maximum grain yields of 5500 to 6200 lbs /a and protein levels in excess of 14.5% were attained with the application of at least 186 lbs NIA. An untimely early season irrigation induced a temporary N deficiency condition for all plots, which may have kept grain yields below the maximum yield possibility for this site. In spite of this, the amount of N predicted by the University of Arizona procedure (197 lbsN/acre) did attain an adjusted economic return which was not significantly different from the maximum numerical yield that was achieved for any of the other N treatments.

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7

Ashley, Roger Orrin 1953. "The performance of selected small grain cultivars under an irrigation gradient". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277153.

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Differential adaptations of barley (Hordeum vulgare L.) and wheat (Triticum spp.) genotypes suggest that they be evaluated under multi-environmental conditions. The objectives of this study were to determine if small grain genotypes, bred for various moisture conditions, respond differently in terms of yield, water use, and rooting pattern to contrasting moisture conditions. Eight small grain genotypes were compared under a gradient of water from 89 to 404 mm (plus 254 mm of stored water) in a field study at Marana, AZ. A barley bred for low input conditions had greater root density in the subsoil and used moisture earlier in the season when compared to a high input barley (WestBred Gustoe). The cultivars bred for high input conditions required more water for optimum yield compared to those bred for low input conditions.

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8

Yagi, Kazuhiko 1957. "Near real-time irrigation scheduling using the Bowen ratio technique". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277106.

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Abstract (sommario):

The actual evapotranspiration rate for wheat at the Campus Agriculture Center (CAC) and alfalfa at the Maricopa Agricultural Center (MAC) were measured using the Bowen ratio technique for near real-time irrigation scheduling. The Bowen ratio method underestimated evapotranspiration when compared with AZMET and Penman data. There were problems with the hygrometer and the net radiometer which might have caused this underestimation. The height-fetch ratio requirement was not met, and this may have affected the data. Irrigation scheduling programs and the technique to schedule irrigation in a near real-time were developed. Irrigation programs were not field tested because of the problem with field data. Simulated data was successfully used to demonstrate its application. It was found that irrigation could be scheduled in a near real-time with the programs provided reliable data and proper data acquisition systems are used.

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9

Doerge, T. A., T. C. Knowles, L. Clark e E. Carpenter. "Effects of Early Season Nitrogen Rates on Stem Nitrate Levels and Nitrogen Fertilizer Requirements During Grain Filling for Irrigated Durum Wheat". College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/201074.

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Abstract (sommario):

A field experiment was conducted on a Pima clay loam at the Safford Agricultural Center to: 1) determine the optimum rates of late season N needed to achieve optimum yield and quality of irrigated durum wheat in conjunction with varying rates of early season N; and 2) evaluate the usefulness of stern NO₃-N analysis in predicting the late season N rates which optimize grain production but minimize the potential for nitrate pollution of groundwater. The application of 75, 175 and 350 lbs. N/a during vegetative growth resulted in wheat with deficient, sufficient and excessive N status at the boot stage, as indicated by stem NO₃-N analysis. The application of 60 lbs. N/a at heading to N- deficient wheat and 15-20 lbs. N/a to N-sufficient wheat resulted in grain protein levels above 14 %, but the applications had little effecton grain yield. Applications of N at heading to wheat which had previously received excessive N did not affect grain yield or quality. The use of stein NO₃-N analysis appears to be a useful tool in predicting the minimum N rate to be applied during the early reproductive period to insure acceptable levels of grain protein at harvest.

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10

Chen, Chengci. "Comparisons of changes in the osmotic potential and apoplast water volume caused by water stress in four cultivars of spring wheat (Triticum aestivum L.)". Thesis, 1995. http://hdl.handle.net/1957/35133.

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11

Schillinger, William F. "Fallow water retention and wheat growth as affected by tillage method and surface soil compaction". Thesis, 1992. http://hdl.handle.net/1957/36389.

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Abstract (sommario):

No-tillage winter wheat (Triticum aestivum L.) grown in a wheat-fallow cropping system has consistently produced lower grain yields than conventionally tilled soils in the semiarid Pacific Northwest. A 2-year study was conducted in a long-term tillage trial at Moro, OR to determine factors responsible for differences in wheat growth and yield as affected by moldboard plow, stubble mulch, and no-tillage fallow method. Soil water, soil mineral N, plant N uptake, soil temperature, above-ground dry matter accumulation, and yield components were measured. The highest fallow efficiency during both years was achieved by stubble mulch tillage, followed by the plow and no-tillage systems. Accelerated water loss from no-tillage fallow occurred during the hot, dry summer due to uninterrupted capillary flow. The main yield limitations to no-tillage technology in this study were: (1) diminished seedzone water at planting time in the fall which resulted in reduced germination and stand establishment; (2) cooler spring soil temperatures which slowed crop development and dry matter accumulation, and; (3) production of fewer spikes per unit area. The second objective of this study was to determine if late season seedzone water loss from fallow could be reduced by altering the physical characteristics of the dust mulch. Loss of seedzone water appears to accelerate in late August and September because of increased diurnal heat flux. Compacting the soil surface with a roller in mid-August increased surface bulk density and volumetric water content to depths as great as 10 cm. Evaporative water loss from compacted plots, however, occurred at a faster rate than from control plots and, by mid-September, there were no differences in seedzone water content among treatments. Increased soil thermal conductivity appeared to be the reason for accelerated water loss in compacted treatments. Although water loss occurred at a faster rate in compacted treatments, compacting fallow soils with a roller immediately prior to fall seeding may increase winter wheat germination, emergence, and stand establishment during years of marginal seedzone water.
Graduation date: 1992

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12

Condon, Anthony Gerard. "The use of carbon isotope discrimination in screening wheat genotypes for efficient use of water". Phd thesis, 1988. http://hdl.handle.net/1885/142490.

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13

Ali, Safdar. "Growth, yield and water use of rainfed wheat and maize influenced by tillage and fertilizer in Pothwar, Pakistan". Thesis, 1993. http://hdl.handle.net/1957/35387.

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14

Herwaarden, Anthony Francis van. "Carbon, nitrogen and water dynamics in dryland wheat, with particular reference to haying-off". Phd thesis, 1995. http://hdl.handle.net/1885/143831.

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15

Sarvestani, Zeinolabedin Tahmasebi. "Water stress and remobilization of dry matter and nitrogen in wheat and barley genotypes". 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs251.pdf.

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Abstract (sommario):

Bibliography: leaves 223-247. Effects of water availability during grain filling is examined in wheat (Triticum aestivum L.) and barley (Hordum vulgare L.) genotypes. The study tests the accumulation of dry matter (DM) and nitrogen (N) in the grain and also their remobilization from the shoot to the grain. Water stress during grain filling was found to reduce DM and N accumulation and also to increase N concentration in both wheat and barley grain.

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16

Sarvestani, Zeinolabedin Tahmasebi. "Water stress and remobilization of dry matter and nitrogen in wheat and barley genotypes / by Zeinolabedin Tahmasebi Sarvestani". Thesis, 1995. http://hdl.handle.net/2440/18726.

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Abstract (sommario):

Bibliography: leaves 223-247.
xiii, 247 p. : ill, maps ; 30 cm.
Effects of water availability during grain filling is examined in wheat (Triticum aestivum L.) and barley (Hordum vulgare L.) genotypes. The study tests the accumulation of dry matter (DM) and nitrogen (N) in the grain and also their remobilization from the shoot to the grain. Water stress during grain filling was found to reduce DM and N accumulation and also to increase N concentration in both wheat and barley grain.
Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Science, 1996

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17

Norrish, Shane A. "Soil and water interactions controlling wheat crop response to phosphorus fertiliser in north-western New South Wales". Thesis, 2003. http://handle.uws.edu.au:8081/1959.7/613.

Testo completo

Abstract (sommario):

This thesis examines the response to P fertiliser by wheat crops growing in the vertosol soils of the low rainfall areas of the northern grain zone of eastern Australia. Farmers in this region depend on water accumulated from rainfall over a fallow period and stored in the subsoil to increase wheat grain yield beyond that normally achievable from in-crop rainfall and to decrease the production risks due to rainfall variability. The large variability in stored water, seasonal rainfall and subsoil properties result in extremely varied yield and yield responses to P fertiliser between seasons and between sites. Finally, as a practical guide to predicting wheat response to P fertilizer: 1/. current sampling strategies of determining P only in the surface 10 cm appear to be adequate for soils with bicarbonate P concentrations greater than 15 mg/kg. 2/. For soils with lower concentrations in the surface, sampling of 80 cm is recommended. Crops with a mean concentration of bicarbonate P greater than 7 mg/kg between 10 - 80 cm are unlikely to respond to P fertiliser. 3/. No increase in profitable grain yield response was found for fertiliser applications greater than 10 kg P/ha.

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