Tesi sul tema "Fertilizers, Fertilizer Application"
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Feland, Calli. "Nitrogen Fertilizer Types and Application Timing on Hard Red Spring Wheat Productivity and Grain Protein". Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/29209.
Testo completoMinnesota Wheat and Promotion Council
Mezainis, Valdis Edgars 1947. "Nitrogen fertilizer and water application rate interactions in trickle irrigated cotton". Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/191097.
Testo completoWoldetsadik, Kebede. "Shallot (Allium cepa var. ascolonicum) responses to plant nutrients and soil moisture in a sub-humid tropical climate /". Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a367.pdf.
Testo completoShiflett, Melinda Cole. "Criteria signaling reapplication of controlled-release fertilizer for maximum growth of Ilex crenata Thunb. 'Helleri'". Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040325/.
Testo completoKang, Choongkwan. "Evaluation of economic and water quality effects for variable rate application of nitrogen fertilizer /". free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9821346.
Testo completoFava, Erica. "The effects of the level and timing of nitrogen fertilizer application on red pepper production in Québec /". Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20819.
Testo completoMOHAMED, IBRAHIM ELBASHIR. "EFFECTS OF PRE-PLANT APPLICATION OF NITROGEN FERTILIZER ON SYMBIOTIC NITROGEN FIXATION AND YIELD OF COWPEAS (VIGNA UNGUICULATA (L.) WALP.)". Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187957.
Testo completoJakkula, Vijay S. "Synthesis of zeolites and their application as soil amendments to increase crop yield and potentially act as controlled release fertilizers". Thesis, University of Wolverhampton, 2005. http://hdl.handle.net/2436/93299.
Testo completoHans, Ralston Ronald. "Initial growth responses to controlled release fertilizer application at establishment of commercial forestry species in South Africa". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85609.
Testo completoENGLISH ABSTRACT: In South Africa fertilizer applications at establishment is a common practice in the forestry industry. Recommendations are based on past research with conventional sources (CV) and as a result there have only been slight improvements in additional plantation production over recent years. The objective of this study was to investigate initial stand responses in terms of leaf are index (LAI), foliar nutrient content, biomass index (BI) and volume growth to the application of controlled release fertilizers (CRF) at re-establishment. Nitrogen (N), phosphorus (P) and potassium (K) were applied in a three way factorial combination to Pinus radiata at planting on a site in the Western Cape. The design was replicated five times across the study area. N (CRF) and P (CV) were applied in a two way factorial combination at planting to two Eucalyptus grandis x urophylla hybrids and Eucalyptus dunnii across three sites, one ex-agricultural and two re-establishment sites, on the Zululand coastal plain and the Midlands region. The design was replicated nine times on each study site. Harvesting residues were burnt on the eucalypt sites prior to establishment and may have had an impact on the responses found. An outbreak of Fusarium circinatum on the P. radiata site resulted in unexpected and extremely variable responses. An attempt to quantify the effect of the disease had limited success. The mean BI of the control treatment reached 25. The best CV and CRF treatments yielded improvements of 42 % and 83 % in BI over the control respectively, with only the CRF treatment difference being significant. Foliar analysis results revealed marginal to deficient concentrations of P and Mg being alleviated by the treatments in question. On the KZN Zululand sites there was a marked response of the hybrids to N with P having an additive effect on volume growth, LAI and foliar N content. Application of 120 g N and 20 g P per tree on the ex-agriculture site produced a volume of 8 m3 ha-1 at one year of age, a significant increase of 118 % and 80 % over the control and best CV treatment respectively. Application of 80 g N and 20 g P per tree, on the re-establishment site, yielded a volume of 24.6 m3 ha-1 at one year which equates to a significant 39 % and insignificant 7 % additional volume at one year over the control and best CV treatment respectively. A non-significant suppressive effect was found with 20 g CV P application only. At the KZN Midlands site, the major early response in height were to P application. Applications of 20 g CV P per tree, resulted in a mean height of 162.6 cm at seven months of age, a significant 28 % higher than the control. There was no significant effect of 80 g CRF N and 20 g CV P per tree respectively. CRF N applications up to 120 g per tree provide additional growth over recommended CV applications on coastal Zululand sites with low organic carbon (OC) content. On the KZN Midlands site with higher OC and clay content, early responses were limited to P fertilization only regardless of the fertilizer source.
AFRIKAANSE OPSOMMING: Dit is algemene praktyk in die Suid Afrikaanse bosbou industrie om kunsmis tydens aanplanting toe te dien. Hierdie aanbeveling is gebasseer op navorsing resultate met konvensionele bronne (CV), gevolglik was slegs ‘n klein toename in bykomende plantasie produksie gemeet die afgelope paar jaar. Die doelwit tydens hierdie studie is om die aanvanklike reaksie van die bome in terme van blaar oppervlak indeks (LAI), blaar-voedingstof inhoud, biomassa indeks (BI) en volume op die toediening van beheerde vrylating kunsmis (CRF) tydens aanplanting vas te stel. Stikstof (N), fosfor (P) en kalium (K) is in drie-ledige kombinasie aan Pinus radiata op ’n plantasie in die Weskaap toegedien. Die ontwerp is vyf keer in die studiegebied herhaal. N en P is in twee-ledige kombinasie aan twee Eucalyptus grandis x urophylla hibriede en Eucalyptus dunnii op drie groeiplekke, een eks-landbou en twee eks-bosbou, op die Zoeloeland kusvlakte en in die Natalse Middellande toegedien. Die ontwerp is nege keer in elke studiegebied herhaal. Oesreste is voor aanplanting op die Eucalyptus groeiplekke verbrand. Die voorkoms van Fusarium circinatum op die P. radiata groeiplek het onverwagte en hoogs uiteenlopende reaksies tot gevolg gehad. ’n Poging om die effek van die siekte te kwantifiseer, was slegs gedeeltelik suksesvol. Die gemiddelde BI van die kontrole behandeling, was 25. Die beste CV en CRF behandeling het onderskeidelik 42 % en 83 % hoër BI as die kontrole groep gehad, waarvan slegs die CRF behandeling beduidend was. Blaarontleding het gewys dat daar marginale of ontoereikende konsentrasies van P en Mg was. In Zoeloeland het die Eucalyptus hibriede ’n beduidende reaksie op N en P getoon met meer volume groei, LAI en N inhoud. Die toediening van 120 g N en 20 g P per boom op die eks-landbou groeiplek het ’n volume van 8 m3 ha-1 op eenjarige ouderdom tot gevolg gehad. Dis beduidend beter met 118 % en 80 % onderskeidelik vir die kontrole en beste CV behandeling. Die toediening van 80 g N en 20 g P per boom op die hervestigde eks-bosbou groeiplek, het ’n volume van 24.6 m3 ha-1 op eenjarige ouderdom tot gevolg gehad. Dit is 39 % beduidend en 7 % onbeduidend addisionele volume op eenjarige ouderdom vir onderskeidelik die kontrole groep en beste CV behandeling. ’n Onbeduidende depressie effek is met die alleen toediening van 20 g CV P gevind. In die Natalse Middellande groeiplek het die toediening van P ‘n vroeë reaksie in hoogte groei veroorsaak. Die toediening van 20 g CV P per boom, het ’n gemiddelde hoogte van 162.6 cm op die ouderdom van sewe maande tot gevolg gehad. Dit is 28 % beduidend hoër as die kontrole. Die toediening van 80 g CRF N en 20 g CV P per boom was onbeduidend. Toedienings van CRF N tot en met 120 g per boom het in die kusgebiede van Zoeloeland met ‘n lae organiese koolstof (OC) inhoud, groter groei as die aanbevole CV toedienings gehad. Die Middellande groeiplek met ’n hoër OC en klei inhoud, was die vroeë reaksie alleenlik beperk tot P bemesting.
Mpabanga, Nkosi. "The effect of phosphorus fertilizer application on growth, biomass and nutritive value of Pigeon pea (Cajanus cajan (L.) Millsp.) varieties in Alice, South Africa". Thesis, University of Fort Hare, 2017. http://hdl.handle.net/10353/6180.
Testo completoNurmakhanova, Mira. "Essays on fall fertilizer application". [Ames, Iowa : Iowa State University], 2008.
Cerca il testo completoStroehlein, Jack, Karen Kebler e Paul Forrest. "Response of Guar to Fertilizer Applications". College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/200554.
Testo completoRose, Terry. "Deep-placed phosphate fertiliser improves phosphorus uptake and seed yield of canola (Brassica napus L.) in a Mediterranean-type climate". University of Western Australia. Dept. of Soil Science and Plant Nutrition, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0237.
Testo completoAhmed, Sabah Kedar. "Yield, dry matter production, and nitrogen uptake of drip irrigated cotton". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/191143.
Testo completoMohamed, Abdellatif Abdellatif 1956. "Response of cotton to N and water applied via a trickle irrigation system : growth, yield, and nutrient uptake". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/191128.
Testo completoWoodward, Timothy Ryan. "Evaluation of Urea Ammonium-Nitrate Fertilizer Application Methods". Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76800.
Testo completoMaster of Science
Gardner, B. R., e T. C. Tucker. "Effect of Phosphorus Fertilizer Application on Cotton Yields". College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/204087.
Testo completoStroehlein, J. L., W. C. Hofmann, S. K. Ahmed e Cathy Creekmore. "Response of Surface Drip Irrigated Cotton to Fertilizer Application". College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/219761.
Testo completoFertilizer nitrogen rates and the addition of phosphorus, potassium and zinc were studied in a drip irrigated field at Eloy. Response to nitrogen was found with the optimum rate being about 170 lbs/acre although higher rates tended to increase yields. Significant response to P and K were not found, but there appeared to be a response to zinc. Yields were below desired levels because of problems with obtaining a good stand and infestations of cotton rust and root rot.
Zhang, Feng 1962. "Effects of N formulation, application rate, and application time on corn yield and quality in eastern Canada". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61039.
Testo completoFULTON, JOHN PATRICK. "A SPATIAL MODEL FOR EVALUATING VARIABLE-RATE FERTILIZER APPLICATION ACCURACY". UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/248.
Testo completoHulm, Sharon C. "Fertilizer nitrogen transformations following urea application to an afforested ecosystem". Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU010535.
Testo completoSilvertooth, J. C., G. W. Thacker, J. E. Malcuit, T. A. Doerge e S. H. Husman. "Upland and Pima Cotton Response to Banded Fertilizer Applications, 1990". College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/208629.
Testo completoBhogal, Anne. "Effect of long-term nitrogen applications on nitrogen cycling under continuous wheat". Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294731.
Testo completoGildow, Marie C. "Evaluating Fertilizer Application Practices to Reduce Phosphorus Discharge from the Maumee River". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437400849.
Testo completoSunderlage, Brent. "LATE APPLICATION NITROGEN ON CORN IN SOUTHERN ILLINOIS AND SOIL PROPERTIES AFFECTING AMMONIA VOLATILIZATION FROM UREA FERTILIZER". OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2154.
Testo completoStovall, Jeremy Patrick. "Growth and Physiological Responses to Fertilizer Application in Clonal Loblolly Pine". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/38684.
Testo completoClones with rapid growth rates can be selected with a range of other desirable traits. Short-term (i.e. weeks) responses to fertilization are often inconsistent with long-term (i.e. years) responses, but are critical to understanding growth responses. We investigated carbon allocation in two full-sibling clones of loblolly pine under two levels of fertilizer application over four months in a greenhouse. Using monthly harvests of some trees and ecophysiological measurements throughout, we determined carbon allocation on a monthly scale. In response to fertilizer application, both clones reduced allocation belowground and increased allocation to foliage to some extent, increasing whole-canopy photosynthetic capacity. However, these changes in allocation were ephemeral. By the end of the experiment, root-shoot ratios were no longer significantly affected by fertilizer application. Clones had allocation patterns distinct from one another, with one allocating more belowground and the other allocating more to stem mass. While their overall growth responses to fertilizer application were similar, the physiological mechanisms that resulted in these responses were different between clones.
Results of the two studies indicate that while fertilizer responses may not need to be included when testing clones for deployment, knowledge of the fertilizer responses of widely-deployed clones would offer forest managers opportunities to apply clone-specific precision-silvicultural systems to optimize growth rates and manage for a range of products.
Ph. D.
Clark, Lee J., e Bryant R. Gardner. "Effect of Nitrogen Fertilizer Application on Cotton Yields, Safford Agricultural Center". College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/219792.
Testo completoA soil depleted of nitrogen by cropping with Sudan grass and removing all the residues was planted to Upland (DP 90) and Pima (S-6) cotton. Nitrogen was added in the form of urea at three different stages of plant growth, applying a total of 0, 50 or 100 pounds of nitrogen. The yield of lint from DP 90 was increased where nitrogen was added; however, there were no differences in yield with the timing nor total amount of nitrogen added. In the case of S-6, fertilizer nitrogen did not increase yield.
Keene, Thomas Clarkson. "SWITCHGRASS YIELD AND QUALITY WITH MULTIPLE FERTILIZER APPLICATIONS AND HARVEST DATES". UKnowledge, 2014. http://uknowledge.uky.edu/pss_etds/42.
Testo completoWagner, Nicole Catherine. "Wheat yield prediction modeling for localized optimization of fertilizer and herbicide application". Diss., Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/wagner/WagnerN0805.pdf.
Testo completoNelson, J. M., e G. L. Hart. "The Response of Lesquerella to Nitrogen Fertilizer Rate and Time of Application". College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/202423.
Testo completoCampbell, Allan J. "Design and evaluation of liquid swine manure injectors for potato nutrient placement". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0025/NQ50124.pdf.
Testo completoNorton, E. R., L. J. Clark e H. Borrego. "Evaluation of Variable Rate Fertilizer Applications in an Arizona Cotton Production System". College of Agriculture, University of Arizona (Tucson, AZ), 2005. http://hdl.handle.net/10150/198174.
Testo completoGarcia, Teijeiro Rosalia. "Effect of slow release nitrogen fertilizer application on soil quality-soil microbial population /". Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1324374171&sid=9&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Testo completoHorner, Emily Renee. "THE EFFECT OF NITROGEN APPLICATION TIMING ON PLANT AVAILABLE PHOSPHORUS". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211932436.
Testo completoDeizman, Marcia McCutchan. "A computer simulation model for investigating the effect of land application of sludge on runoff water quality". Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44629.
Testo completoMaster of Science
Schoeman, Stephanus P. (Stephanus Philippus). "Physiological measurements of daily daylight fertigated citrus trees". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53000.
Testo completoENGLISH ABSTRACT: Daily daylight fertigation regimes (involvinq drip fertigation, on a daily basis, during the daylight hours) are becoming widely used in the South African citrus industry in the endeavor to enhance tree productivity. Such regimes could provide sensitive nutrient and moisture management, reducing plant stress in general as well as the response time to root-directed cultural activities. There is a need to evaluate the efficacy of daily daylight fertigation systems relative to conventional irrigation systems. Standard horticultural evaluation of orchard management practices is very time consuming. We opted for physiological studies comparing plant stress levels, in an attempt to quantify plant performance under each system. Citrus trees under daily daylight fertigation and conventional micro-jet and drip-irrigated regimes were monitored to establish plant stress levels as indicated by sap flow, xylem water potential, stomatal conductance and chlorophyll a fluorescence. Plants under a daily daylight fertigation regime are believed to have good soil water conditions in their rooting volume, and therefore experience negligible baseline levels of stress. The trees do, however, experience midday depression in stomatal conductance, to a lesser degree, but not unlike trees under conventional regimes. It appears as if a larger rooting volume of microjet irrigation regimes enhances recovery from the midday depression. It is recommended that producers optimise productivity during the moming hours, by early irrigation, so that plants can function optimally, whilst environmental conditions are most favourable for high physiological activity. We also assessed the effect of withholding water from trees adapted to a daily daylight fertigation regime to evaluate the risk involved with short-term water deficits in trees adapted to this regime, as well as the usefulness of physiological techniques for identifying water stress. Stomatal conductance and xylem water potential indicated water stress sooner than the other physiological parameters. Citrus trees seem to be relatively insensitive to water deficit stress as measured by sap flow and chlorophyll a fluorescence. Sap flow is buffered by tree capacitance, and although mediated via stomatal conductance, atmospheric conditions and not the soil water content primarily determine it. As daily fertigation is applied to trees under DOF regimes, they exhibit more optimal levels of xylem water potential and stomatal conductance, compared to trees from which water is withheld. Although alleviating it to a degree, daily irrigation did not mitigate the midday depression in these values. Seen over a season, even small enhancements of stomatal conductance (and with it photosynthesis and possibly, growth) and xylem water potential, could incrementally produce higher yields.
AFRIKAANSE OPSOMMING: In die strewe na verhoogde boomproduktiwiteit, word daaglikse sproeibemesting (deur 'n drupbesproeiingsstelsel toegedien tydens die dagligure) al meer algemeen in die Suid Afrikaanse sitrusbedryf gebruik. Hierdie praktyk verminder algemene plantstres deur baie spesifieke voedingsen vogbeheer, en verkort ook die plant se reaksietyd op wortelgerigte bewerkingsaktiwiteite. Dit is nodig om die relatiewe voordeel van daaglikse sproeibemesting teenoor konvensionele besproeiingssisteme te evalueer. Huidige tuinboukundige evaluering van boord-bestuurspraktyke is baie tydrowend. In 'n poging om plantreaksie onder verskillende praktyke te beskryf, het ons besluit om die plantstresvlakke met fisiologiese metodes te vergelyk. Sitrusbome onder daaglikse sproeibemesting, en konvensionele mikro- en drupbesproeiing, is onderskeidelik gemonitor om die plant se stresvlakke vas te stel, soos aangedui deur sapvloei, xileem-waterpotensiaal, stomatale geleiding en chlorofil a f1uoresensie. Die plante onder daaglikse sproeibemesting ondervind lae viakkke van waterstremming, waarskynlik weens hoë grondvogtigheid in die wortelsone. Die bome ondervind wel, soos dié onder konvensionele besproeiing, middagdepressie in stomatale geleiding, hoewel tot 'n mindere mate. Dit blyk asof die groter wortelvolume van mikrospuit besproeide bome die herstel na middagdepressie bespoedig. Produsente word aangeraai om die oggendure optimaal te gebruik deur vroeg te besproei sodat plantproduktiwiteit hoog is terwyl die omgewingsfaktore op hul gunstigste is en wanneer die hoogste fisiologiese aktiwiteit voorkom. Ons het ook die effek van wateronthouding gemeet op die bome wat aangepas is vir daaglikse sproeibemesting. Sodoende is die risiko verbonde aan 'n korttermyn watertekort op hierdie bome ge-evalueer, asook die bruikbaarheid van fisiologiese tegnieke om waterstremming in sitrus te identifiseer. Stomatale geleiding en xileem-waterpotensiaal het waterstremming vroëer aangedui as die ander fisiologiese parameters. Sitrusbome blyk redelik onsensitief te wees teenoor droogtestremming soos gemeet deur sapvloei en chlorofil a fluoresensie. Sapvloei word gebuffer deur boom-kapasitansie, en alhoewel sapvloei gereguleer word deur stomatale geleiding, is dit die atmosferiese toestande (hoofsaaklik dampdruk verskil) wat dit primêr beïnvloed, en nie die grond-water inhoud nie. Omdat bome daagliks sproeibemes word, het hulle meer optimale vlakke van xileemwaterpotensiaal en stomatale geleiding in vergelyking met bome waarvan water weerhou is. Alhoewel daaglikse sproeibemesting die middagdepressie verlaag het, is dit nie daardeur opgelos nie. Oor die typerk van 'n seisoen kan selfs minimale verhogings in stomatale geleiding (en daarmeesaam fotosintese en moontlik groei) en xileem-waterpotensiaal, hoër opbrengste tot gevolg hê.
Tejos, Dante Pinochet. "The residual effect of applications of phosphate fertilizer measured by the Olsen method". Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308579.
Testo completoPalumbo, John C. "Compatibility of Fertilizer and Neonicotinoid Soil Applications for Whitefly Control in Spring Cantaloupes". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/214963.
Testo completoColley, Richard T. III. "Development of a Machine Vision System for Mass Flow Sensing and High-Resolution Mapping of Granular Fertilizer Application". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543564969065918.
Testo completoWeggler-Beaton, Karin M. "The beneficial and detrimental effects of sewage sludge applications in South Australia". Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phw4113.pdf.
Testo completoTorr, Leigh Christine. "Applications of dairy wastewater as a fertilizer to agricultural land : an environmental management perspective". Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1641.
Testo completoAs with any form of intensive agriculture, there are potential environmental impacts associated with the management and housing of livestock on dairy farms. Within the field of dairy farming, particular focus falls to the issue of environmental degradation of water resources, as this form of pollution is currently a major environmental issue around the world. Conventional agricultural practices involving the application of chemical fertilizers to land and crops are causing environmental problems as a result of poor management practices. Dairy wastewater and manures could however be a valuable resource for agricultural producers in the form of an alternate fertilizer for their crops. Waste application as a fertilizer is more environmentally friendly than chemical fertilizers, and could drastically reduce costs for farmers, whilst alleviating storage and management problems often associated with farmyard manures (FYM). The application of organic wastes, notably livestock manures, to land has historically been important for maintaining soil fertility on farms in terms of nutrient status and organic matter levels, as well as helping to reduce soil erosion and improve waterholding capacity. The research sought to investigate the environmental and economical feasibility of using dairy wastewater and manures as an alternative form of fertilizer within agriculture in South Africa.
Gouveia, Aline Mendes de Sousa 1985. "Adubação potássica na produção e qualidade pós-colheita do rabanete /". Botucatu, 2016. http://hdl.handle.net/11449/136239.
Testo completoBanca: Pablo Forlan Vargas
Banca: Eliane Aparecida Benato Rodrigues da Silva
Resumo: O rabanete pode ser cultivado entre o período de safra de outras culturas de ciclo mais longo, sendo uma opção interessante aos pequenos produtores rurais que enxergaram nesta hortaliça uma possibilidade de incremento na rentabilidade das suas áreas. Devido a poucas informações na literatura que mostrem os efeitos do potássio na produção, qualidade e nas características bioquímicas do rabanete, objetivou-se com este trabalho avaliar os efeitos da adubação potássica aplicado em cobertura na produção e qualidade pós-colheita da cultura do rabanete armazenado sob refrigeração. O experimento foi conduzido na Fazenda Experimental da FCA/UNESP, em São Manuel/SP e as avaliações foram realizadas no Departamento de Horticultura da Faculdade de Ciências Agronômicas (FCA/UNESP). O delineamento experimental foi em blocos ao acaso, composto por cinco tratamentos de doses de potássio (K2O) (0; 22,5; 45; 67,5 e 90 kg ha-1) na forma de cloreto de potássio em cobertura, com cinco repetições. Foram avaliadas as características vegetativas da planta, acúmulo de nutrientes na raiz e produtividade. Para as características de qualidade (físico-química e bioquímica) as raízes colhidas foram armazenadas a temperatura de 5 ± 1 °C e UR de 85 ± 5 % durante 28 dias, sendo avaliadas a cada 7 dias, quanto a perda de massa, pH, acidez titulável, sólidos solúveis, açúcares redutores, ácido ascórbico (vitamina C), compostos fenólicos, pigmentos (carotenoides e antocianinas totais) e atividade enzimática (peroxidase). Para as características de produção do rabanete, obtiveram-se respostas lineares significativas em função das doses de potássio aplicadas em cobertura para: altura de plantas, massas da matéria fresca da parte aérea, raiz e total, com incremento de 0,46 cm, 0,61 g, 1,05 g, e 2,02 g por planta para cada 10 kg ha-1 de K2O aplicados, respectivamente. Para produtividade ...
Abstract: The radish is grown in consortium with other longer-cycle crops, but now small farmers have seen in the vegetable, a chance to increase the profitability of their areas. The literature has little information as to potassium's effects on the production, quality and the biochemical Radish characteristics. This study is aimed to evaluate the effects of potassium fertilizer applied in coverage in the production and culture of post-harvest quality radish under refrigeration. The experiment was conducted at the Experimental Farm of FCA/UNESP in San Manuel / SP and the evaluations were carried out in the Department of Horticulture, Faculty of Agricultural Sciences (FCA / UNESP). The experimental design was in randomized blocks, comprising of five treatments of potassium (K2O) (0; 22,5; 45; 67,5 and 90 kg ha-1) in coverage, with five repetitions. We evaluated the vegetative characteristics of the plant, nutrient accumulation in the shoots, roots and productivity. For the quality features, physical chemistry and biochemistry harvested roots were stored at 5 ± 1 °C and RH 85 - 90 % for 28 days were evaluated every 7 days, the mass loss, pH, titratable acidity, soluble solids, reducing sugars, ascorbic acid (vitamin C), phenolic compounds, pigments (carotenoids and anthocyanins) and enzyme activity (peroxidase). For radish production characteristics, we obtained significant responses as a function of potassium doses on coverage for plant height, mass of fresh matter of the aerial part, root and total, an increase of 0,46 cm, 0,61 g, 1,05 g and 2,02 g per plant per 10 kg ha-1 K2O applied, respectively. The decreasing order of macronutrintes accumulated by the root is: K> N> Ca> P> S> Mg. For productivity, there was an increase by 1,05 t ha-1 every 10 kg ha-1 K2O applied and the dose 52,4 kg ha-1 K2O with the highest percentage (97,7 %) in marketable yield. For the physicochemical and biochemical ...
Mestre
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