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Dissertations / Theses on the topic 'Phosphorus in agriculture'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2024

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1

Bujatzeck, Baldur. "Decision support system for alleviating phosphorus contamination." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22032.

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The management of natural resources has greatly improved over the past decade. Despite advances in modelling the fate of nutrients or in modelling socio-economic effects of different farm management strategies, tools that integrate the advances made in these fields are still lacking. To develop a tool to overcome this gap, this research focused on the development of a multi-objective decision support system (MODSS) to alleviate phosphorus (P) contamination from agricultural fields and small watersheds. A decision supporting framework was designed to allow technical and public users to run the

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2

Cooperband, Leslie Rose. "Soil phosphorus dynamics in a humid tropical silvopastoral system /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487777901660164.

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3

Donkor, Joseph. "Evaluation of the Potential for Direct-Fed Microbials to Enhance Utilization of Phosphorus in Broiler Chickens." Thesis, Tennessee State University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10641460.

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<p> Feed accounts for about 60–68% of the total cost of poultry production. Chicken cannot efficiently absorb organic or phytin-bound phosphorus, thus about 70–80% of dietary or plant based phosphorus is excreted in the manure of broiler chickens. The goal of this research was to identify microbes with the potential to improve utilization of a plant source of phosphorus in the gastrointestinal tract (GIT) of broilers. </p><p> A total of 8,082 sequences were obtained using a metagenomic approach, with 61% of those sequences representing 5,030 species of various bacterial organisms

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4

Cucarella, Cabañas Victor. "Phosphorus recycling from wastewater to agriculture using reactive filter media." Licentiate thesis, KTH, Land and Water Resources Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4449.

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<p>This thesis focused on testing the suitability of reactive filter media used for phosphorus (P) removal from wastewater as fertilizers, thus recycling P to agriculture. The work compared the P sorption capacity of several materials in order to assess their suitability as a source of P for plants. The selected materials (Filtra P, Polonite and wollastonite) were saturated with P and used as soil amendments in a pot experiment. The amendments tended to improve the yield of barley and ryegrass compared with no P addition. The amendments also increased soil pH, P availability and cation exchang

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5

Cucarella, Cabañas Victor. "Phosphorus recycling from wastewater to agriculture using reactive filter media /." Stockholm : Mark- och vattenteknik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4449.

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6

Pierzynski, Gary Michael. "The chemistry and mineralogy of phosphorus in excessively fertilized soils /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487670346875087.

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7

Creekmore, Cathy E., and J. L. Stroehlein. "Phosphorus Response in Wine Grapes." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/215732.

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8

Yibirin, Humberto Peluffo. "Effects of daily applied nitrogen forms and phosphorus on corn production /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487856076413367.

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9

Thompson, Christopher. "The Effect of Phosphorous Placement & Rate on Phosphorus Uptake, & Growth & Yield of Tomatoes." TopSCHOLAR®, 1990. https://digitalcommons.wku.edu/theses/2931.

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Research was undertaken in the summer of 1989 to determine the effect of phosphorus placement on the yield and quality of field grown tomatoes Lycopersicon esculentum. A subsequent study was undertaken in the winter of 1989 to determine the effect of phosphorus rate and placement on the early growth and phosphorus uptake of young tomatoes in the greenhouse. The purpose of this study was to attempt to find the most efficient placement and rate of supplemental phosphorus when growing tomatoes. It has been shown that placing phosphorus in a concentrated zone in contact with plant roots results in

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10

Seiler, Lauren Katherine Kaye Jason P. "Exploring potential soil phosphorus movement in four organic agriculture forage systems." [University Park, Pa.] : Pennsylvania State University, 2009. http://honors.libraries.psu.edu/theses/approved/WorldWideIndex/EHT-44/index.html.

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11

Herman, Melissa C. "Laboratory Evaluation and Soil Test Phosphorus Trends in Ohio." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308336863.

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12

Norton, E. R., J. C. Silvertooth, and L. J. Clark. "Phosphorus Fertility Evaluation in Graham County." College of Agriculture, University of Arizona (Tucson, AZ), 2002. http://hdl.handle.net/10150/197714.

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A series of three phosphorus (P) fertility experiments were conducted in 2001 in Graham County. These studies follow similar experiments conducted over the past three seasons. Results from 2001 were consistent with previous results indicating a positive relationship between yield and P fertilizer applications in relation to soil test indices. Modest yield increases were observed from a minimum of 25 to 80 lbs. lint per acre with an application of approximately 70 lbs. of P as P₂O₅ per acre. Yield differences from previous years have been as great as 170 lbs. of lint per acre. With the increase

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13

Norton, E. R., and L. J. Clark. "Phosphorus Fertility Evaluation in Graham County." College of Agriculture, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/197930.

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A field study was implemented in 2002 in the Upper Gila River Valley of Safford to investigate the effects of varying phosphorus (P) fertilization rates on yield and quality of Upland cotton. This study is a continuation of work performed in this valley that began in 1998. This study was organized in a randomized complete block design with four treatments including four rates of 10-34-0 fertilizer, 0, 15, 30, and 45 gallons per acre (gpa) replicated 4 times. Lint yield results indicate a positive response to the application of 10-34-0 fertilizer with yield increasing linearly up to 30 gpa. The

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14

Dupas, Rémi. "Identification et modélisation des processus à l'origine des transferts de phosphore dissous dans un bassin versant agricole." Thesis, Rennes, Agrocampus Ouest, 2015. http://www.theses.fr/2015NSARD078/document.

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Le phosphore (P) est un facteur de contrôle de l’eutrophisation. Sa présence dans les masses d’eau est liée en partie à des émissions diffuses agricoles. L'objectif de cette thèse a été d'identifier et de quantifier les mécanismes à l'origine des transferts de P diffus, par une démarche intégrant analyse de données d'observations multi-échelle et modélisation.L'analyse d'une chronique de chimie de l'eau à l'exutoire d'un petit bassin versant agricole a révélé que les formes particulaires et dissoutes du P avaient des origines différentes dans le paysage, et étaient transférées de manière indép

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15

Martin, Kent Lee. "Effect of phosphorus placement in reduced tillage crop production." Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1223.

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16

Sen, Amrita. "Techno-Economic and Life Cycle Analysis of Phosphorus Circularity schemes in Agriculture." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1619111447316257.

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17

Gilbert, Jennifer. "Characterizing dissolved phosphorus transport through vegetated filter strips." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 209 p, 2008. http://proquest.umi.com/pqdweb?did=1597617901&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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18

Tickes, Barry, and Mike Ottman. "The Effect of Phosphorus on Alfalfa Yield." College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/201366.

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19

Silvertooth, J. C., T. A. Doerge, G. W. Thacker, S. W. Stedman, and J. E. Malcuit. "Effects of Banded Phosphorus Fertilizer on Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/204814.

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Four field experiments were established in 1988 in Arizona to evaluate the effects of banded phosphorus (P) fertilizers on cotton. 2 sites involved upland cotton (Gossypium hirsutum L.) and 2 sites with pima (G. barbadense L. var Pima S-6), with 1 of each located near Marana, AZ (Vinton Anthony sandy loam). A site with 1 of each kinds was also located near Coolidge, AZ (Mohall sandy loam). At the Marana studies, P was applied 6 inches directly below the zone of seed placement at the time of listing and at the Coolidge sites, P was applied 6 inches below and 2 inches to the side of the zone of

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20

Mejias-Bassaletti, Jaime. "Phosphorus leaching from manure-impacted soils affected by fluctuating water tables." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Summer2005/j%5Fmejias%5F060705.pdf.

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21

Baon, John Bako. "Role of mycorrhizas in the assessment of phosphorus efficiency in cereals." Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phb221.pdf.

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22

Croat, Samantha Jo. "Phosphorus Dynamics and Crop Productivity in Bakken Crude-Oil Remediated Soils." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/29169.

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Thermal desorption (TD), a remediation method used to remove hydrocarbons from contaminated soils, may cause changes in soil properties that threaten soil function and plant productivity. The goal of this research is to better understand the effect that TD treatment has on soils intended for agricultural use. A series of soil phosphorus (P) sorption and desorption experiments were conducted on soils before and after TD treatment to determine P availability for plant uptake and risk for run-off. TD-treated soils retained more P, likely due to mineral transformations of Fe- and Al-oxides. In add

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23

Lansford, Vernon D. "Economic and environmental implications of a phosphorus standard : 160-sow representative farm in Montgomery County, Missouri /." free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3036837.

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24

Gardner, B. R., and 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.

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25

Stroehlein, J. L., M. M. Janat, and C. E. McGuide. "Response of Grape Cultivars to Nitrogen and Phosphorus." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/215733.

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The response of 11 different varieties of grapes treated with different levels of N was studied over a seven-year period Phosphorau fertilizer was applied midway through the study. Tissue samples were tested for total P and NO₃-N content, and yield determined annually. The results showed a positive interaction in tens of increased yield between N and P when sufficient quantities of both nutrients were provided

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26

Sachdeva, Vanita. "Biochar-induced soil stability influences phosphorus retention in the agricultural field in Quebec." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121318.

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Surface runoff from agricultural fields is the largest non-point source of phosphorus (P) that pollutes surface water in humid temperate regions. Best management practices have attempted to reduce P loading and improve P retention in agricultural soils but significant losses continue to occur, emphasizing the need for novel solutions. The objective of this research project was to determine whether biochar amendments in an agricultural soil could reduce P loss in surface runoff by increasing water infiltration or by improving soil stability. Experimental plots were established in St-Francois-Xa

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27

Ottman, Michael J., Thomas L. Thompson, M. T. Rogers, and Scott A. White. "Alfalfa Response to Forms of Phosphorus Fertilizer." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/204090.

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Many agricultural workers feel that 10-34-0 is a superior fertilizer for alfalfa since it is thought to move deeper in the soil with irrigation, be more available to the plant, and result in higher yields at equivalent rates compared to 11-52- 0. We found in our study with 24 cuttings over 3 years that alfalfa yields were similar if fertilized with 10-34-0 or 11-52-0 at equivalent rates. Total plant P was not affected by P fertilizer form or method of application. Broadcast 11- 52-0 resulted in higher soil P levels than water-run 10-34-0 and moved deeper in the soil profile. Broadcast 11-52-0

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28

Abdulnour, Jihad. "Micropropagation of 'John Franklin' rose and its phosphorus uptake." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69582.

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Nodal sections of the winter-hardy 'John Franklin' rose cultivar from field-grown plants were cultured on a modified Murashige and Skoog (MS) nutrient medium. Very high levels of contamination from the surface of the initial sections required that plants be grown under greenhouse conditions. Rose plantlets obtained from subsequent subcultures were used for the first time in a radiotracer experiment with $ sp{32}$P to study the kinetics of phosphorus (P) uptake as a function of temperature of the nutrient medium. P uptake increased with time for rooted and non-rooted plantlets in a linear fashi

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29

Payne, Steven George. "The phosphorus availability of feed phosphates in broilers." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1859.

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Thesis (MscAgric (Animal Sciences))--University of Stellenbosch, 2005.<br>Broiler diets are supplemented with feed phosphates to ensure that adequate available phosphorus is provided in the diet to meet the bird’s requirements. These feed phosphates make a considerable contribution to the total available phosphorus in the diet and small differences in their availability may have significant effects on whether the bird’s requirements are met or not. The variation in availability of phosphorus between feed phosphates belonging to different classes and between feed phosphates of the same generic

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30

Mokase, Tsakani Joyce. "Phosphorus release characteristics and quantification of microbial population at different stages of phospho-compost production." Thesis, University of Limpopo, 2016. http://hdl.handle.net/10386/1834.

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Thesis (M. Sc. Agriculture (Soil Science)) -- University of Limpopo, 2016<br>This study aimed at assess phosphorus (P) solubility and bioavailability from non-reactive Phalaborwa ground phosphate rock (GPR) using thermophilic co-composting technology. Two types of organic wastes (Cattle, CM and poultry manure, PM) were used to produce different mix ratios (5:5, 7:3, 8:2 and 9:1) of phospho-composts. Control compost of both manures without GPR addition were included. Samples of each compost heap were taken at mesophilic, thermophilic, cooling and maturity stages and used for bioquality and chem

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31

Shepherd, Jessica Grace. "Ochre and biochar : technologies for phosphorus capture and re-use." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28907.

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Despite recent instability in the global supply of phosphate-rock derived fertiliser and the potential for this to continue into the future, the recovery of phosphorus (P) from wastewater treatment systems, where P is abundant and accessible, is well below maximum potential. Considerable resource is spent on removing P from wastewater in order to comply with environmental standards and to protect aquatic ecosystems from eutrophication, yet there is little emphasis on capturing the P in a way that is optimised for re-using it as agricultural fertiliser. To address this lack of innovation in the

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32

Stroehlein, Jack, Lee Clark, and Edith DeRosa. "Response of Alfalfa to Phosphorus Fertilizer Sources." College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/203794.

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A field study was carried out to determine the effects of different fertilizers on yield and quality of alfalfa. Two harvests over a period of four cuttings did not reveal any differences due to treatment. While alfalfa often responds to phosphorus (P) fertilizer application, conditions in this study provided adequate P as well as nitrogen (N) and potassium (K).

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33

Olson, Jeremy Ray. "Phosphorus fertilization of corn using subsurface drip irrigation." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/8703.

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Master of Science<br>Department of Agronomy<br>Scott A. Staggenborg<br>In recent years, subsurface drip irrigation (SDI) acres have increased substantially. The use of SDI on corn (Zea Mays L.) in the Great Plains has increased due to increased land costs, reduced irrigation water availability, and higher commodity prices. Applying phosphorus (P) fertilizer through a SDI system becomes a major advantage, but further investigation of the interaction between water and fertilizer is needed. Sub-surface drip irrigation systems can be used to better improve the application efficiencies of fertil

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34

Lamba, Jasmeet Srivastava Puneet Fang Xing. "Surface and subsurface transport of phosphorus from surface and subsurface-applied poultry litter." Auburn, Ala., 2009. http://hdl.handle.net/10415/1964.

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35

Hu, Yaqiong. "The effects of oxidation-reduction potential on the solubility of phosphorus in agricultural water management systems." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19252.

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Previous field studies have shown that dissolved phosphorus (P) concentrations are higher in subsurface drainage water from agricultural fields under water table management (WTM) than under conventional tile drainage. Anaerobic conditions have been shown to alter the Oxidation-Reduction Potential (Eh) of soils. The reducing conditions caused by anaerobic conditions result in the reduction of Fe (III), Mn (III), Mn(V) and other metal phosphates. These reductions cause dissolved P once held in metal phosphates to become mobi

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36

Silvertooth, J. C., E. R. Norton, and A. Galadima. "Evaluation of Potassium and Phosphorus Fertility in Arizona Soils." College of Agriculture, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/211298.

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Two field experiments were conducted during the 2000 growing season to address fertility recommendations for fertilizer phosphorus (P) and potassium (K). A K fertility study was conducted near Tonopah, AZ consisting of two treatments, an untreated control and a treatment receiving a total of 20 gallons of K-Sul/acre. No significant differences were observed in leaf blade K concentrations between treatments. Plant growth and development estimates revealed that fruit retention (FR) levels remained consistently higher in the untreated control versus the treated plots. A second study involved trea

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37

Ward, Nicholas Charles. "Impact of avail® and jumpstart® on yield and phosphorus response of corn and winter wheat in Kansas." Thesis, Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3519.

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38

Knight, Jonathan James. "Chemical phosphorus removal and its influence on sewage sludge particulates and metal availability." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324631.

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39

Lukhele, Nomagugu Precious. "Site-specific environmental risk assessment for phosphorus runoff." Thesis, University of Limpopo, 2014. http://hdl.handle.net/10386/1291.

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Thesis (MSc. Agriculture (Soil Science)) -- University of Limpopo, 2014<br>Phosphorus (P) runoff from agricultural sites and the subsequent loading into surface water bodies contribute to eutrophication. Environmental concerns associated with P loading in soil have motivated the need for the development of a proper tool that will allow farmers to identify agricultural areas or management practices that have the greatest potential to accelerate eutrophication. The objective of the study was to determine the spatial variability of soil test P, soil loss potential of the farm, P application

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40

De, Villiers Chris Johan. "The effect of Phosphorus on the growth, plant mineral content and essential oil composition of Buchu (Agathosma betulina)." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019.1/1867.

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41

Gichangi, Elias Maina. "Enhancing phosphorus availability in some phosphate fixing soils of the Transkei region, South Africa using goat manure." Thesis, University of Fort Hare, 2007. http://hdl.handle.net/10353/80.

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Low availability of soil phosphorus (P) caused by strong sorption of P is a major constraint to agricultural production in most South African soils, particularly those from the high rainfall areas. The aim of this study was therefore to investigate whether combined addition of goat manure with inorganic P fertilizers could enhance P availability in some P fixing soils of the Transkei region, South Africa. The study addressed the following specific objectives (i) to assess P sorption capacities and requirements of selected soils and their relationship with selected soil properties and single po

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42

Norton, E. R., and J. C. Silvertooth. "A Review of 10 Years of Phosphorus Fertility Research in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 2006. http://hdl.handle.net/10150/198214.

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Management of phosphorus (P) fertilizer in Arizona cotton production systems has been studied for many years. A series of field experiments have been conducted across Arizona since 1989 with the most recent trial conducted in 2004. These trials represent over 15 site-years of research investigating the response of upland cotton (Gossypium hirsutum L.) to the application of P fertilizers and have been conducted over a wide range of environmental conditions. A summary of these field trials is presented in this paper. All trials were structured in a similar fashion with a control being compared t

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43

Taylor, Astrea. "Phosphorus mass balance for hypertrophic Grand Lake St. Marys, Ohio." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347933945.

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44

Unruh, B. L., J. C. Silvertooth, A. J. Steger, and E. R. Norton. "Nitrogen, Phosphorus, and Potassium Uptake by Upland and Pima Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/209649.

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Several investigations of nitrogen (N), phosphorus (P), and potassium (K) uptake by Upland cotton (Gossypium hirsutum L.) have been conduced, however no investigations of this type have included American Pima cotton (G. barbadense L.). We conducted a study to describe the total N, P, and K uptake and the partitioning of each nutrient into various plant parts for both Upland and Pima cotton. During the growing seasons of 1990, 1991, and 1992 at two south-central Arizona locations, both Upland (var. DPL 90) and Pima (var. S-6) cotton were grown. Beginning 14 to 20 d after emergence, whole cotton

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45

Harwood, Eric D. "Improving the yields of late-planted winter wheat with seeding rate and phosphorus fertility." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/e_harwood_120309.pdf.

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Thesis (M.S. in soil sciences)--Washington State University, December 2009.<br>Title from PDF title page (viewed on Jan. 25, 2010). "Department of Crop and Soil Sciences." Includes bibliographical references.

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46

Thelander, A. S., and J. C. Silvertooth. "Soil Test Calibration Evaluations for Phosphorus on Upland and Pima Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/197512.

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Numerous field experiments were conducted at a wide range of sites in Arizona from 1988 through 1999 involving phosphate (P) fertilization of cotton (Gossypium spp.). A total of 21 site-years were used to study the effects of P on both Upland (G. hirsutum L.) and Pima (G. barbadense L.) varieties. The purpose of these experiments was to evaluate University of Arizona (UA) soil fertility guidelines with respect to soil test results (NaHCO3 extractable P) and to possibly fine-tune or calibrate these guidelines in relation to soil test P, applied P, and yield for common Arizona soils used in cott

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47

Tickes, Barry R., and Tom Doerge. "Survey of Soil Phosphorus in Established Alfalfa Fields in Yuma County." College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/201365.

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A survey was conducted to evaluate the soil phosphorus levels in a cross section of established alfalfa fields in Yuma County The levels of extractable phosphorus (P) varied from 3 to 43 ppm P. All of the soils testing in the very low (below 5 ppm P) and low categories (5 -10 ppm P) were located in the Wellton-Mohawk Valley and on the Yuma Mesa. Annual soil testing in the fall should be used to identify fields which would be expected to be responsive to P fertilizer applications. Soil testing could also help identify fields less like& to respond to P additions (P values > 15 ppm). Eighty perce

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48

Shumaker, II Paul D. "INORGANIC AND ORGANIC PHOSPHORUS INTERACTIONS WITH HYDROXY-INTERLAYERED SOIL MINERALS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/532.

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Phosphorus (P), a necessary plant and animal nutrient, can also lead to eutrophication of fresh waters when in excess. Appropriate P management is necessary to prevent fresh water pollution. Mineralogy of soil clays has been shown to affect P adsorption, desorption, and movement through soils. Specifically, hydroxy-interlayered minerals have been shown to adsorb and retain inorganic P in soil systems. This study was designed to determine the sorption and desorption characteristics of inorganic, organic, and mixed forms of P interacting with soil hydroxy-interlayered vermiculites (HIV) and smec

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49

Ottman, M. J. "Response of Wheat and Barley Varieties to Phosphorus Fertilizer, 2010." College of Agriculture, University of Arizona (Tucson, AZ), 2010. http://hdl.handle.net/10150/279396.

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Phosphorus fertilizer represents a significant portion of the cost of producing small grains. Some evidence exists that there are differences in the ability of small grain varieties to take phosphorus up from the soil and utilize this nutrient in the grain. The objective of this study is to determine if barley and wheat varieties grown in Arizona differ in their response to phosphorus fertilizer. A study was conducted for the second year at the Maricopa Agricultural Center testing the response of 7 barley and 14 wheat (12 durum wheat and 2 bread wheat) varieties to 2 phosphorus rates (0 and 10

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50

Chauke, Rhandu. "Mineralisation and bioavailability of phosphorus from poultry manure and sewage sludge-based phospho-composts for maize production." Thesis, University of Limpopo (Turfloop Campus), 2014. http://hdl.handle.net/10386/1171.

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Thesis (MSc. Agriculture (Soil Science)) -- University of Limpopo, 2014<br>Phospho-composts of different mix ratios (5:5, 7:3, 8:2 and 9:1) were produced through thermophilic co-composting of poultry manure (PM) and sewage sludge (SS) with ground phosphate rock (GPR). Composted PM and SS without GPR addition were included as control. Cured phospho-composts were chemically characterised and used for both laboratory incubation and greenhouse studies, respectively for phosphorus (P) mineralisation and bioavailability, over a period of 42 days. Results revealed that Bray-P1 concentr

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