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Dissertations / Theses on the topic 'Crops and nitrogen'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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1

Stockdale, Elizabeth Anne. "Nitrogen supply for organic crops." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/27478.

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An integrated series of field, laboratory and pot experiments was carried out between 1990 and 1993 to study the release of nitrogen from organic manures and its subsequent recovery by crops. The aim was to increase understanding of the soil processes controlling N release from manures and therefore enable N supply to be more closely matched to crop demand in organic cropping systems. The study of N release from manures is handicapped by the lack of appropriate methods to measure rates of mineralisation (both net and gross) in the field. The use of isotope dilution techniques under field condi

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2

Ottman, Michael J., and Stephen H. Husman. "Nitrogen content of green crops." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/204062.

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Application of chemical fertilizer is not permitted in production of crops certified as organic, but green manure crops may be used to supply the nutrient needs of these crops. An experiment was conducted on a commercial farm near Litchfield Park to determine the nitrogen content at plowdown of barley mixed with Austrian winter peas, Magnus peas, and/or Lana woolleypod vetch. The crop was planted on 21 October and sampled for plowdown nitrogen content on 1 March. The peas and vetch comprised less than 10% of the dry weight of the mixture since the barley grew more vigorously. The barley contai

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3

Ishikawa, Shoko. "Nitrogen management of strobilurin-treated wheat crops." Thesis, Harper Adams University College, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417586.

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4

Zhao, Shan. "Nitrogen nutrition of hybrid poplars." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/summer2006/S%5FZhao%5F072906.pdf.

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5

BEN, HASSINE MORTADHA. "GROWTH, NITROGEN UPTAKE AND MAIZE NITROGEN RECOVERY OF COVER CROPS IN CONSERVATION AGRICULTURE." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/702471.

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Planting winter cover crops has several benefits compared to keeping the soil bare. The choice of the cover crop species and sowing date is crucial to have the best cover crops establishment and weed suppression. The seeds germination of cover crops is affected by the sowing date with a preference of early sowing. However, the appropriate date of cover crops sowing is not known. Also, cover crops nitrogen dynamics is variable among species. In a conservation agriculture context, we conducted two field experiments in Northern Italy and one laboratory experiment under controlled conditions of te

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6

Mooleki, Siyambango Patrick. "Synchronization of nitrogen availability and plant nitrogen demand, nitrogen and non-nitrogen effects of lentil to subsequent wheat crops." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0029/NQ63902.pdf.

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7

Vaughan, Jeffrey David. "Management and assessment of winter cover crop systems for supplying nitrogen to corn in the mid-Atlantic region of the United States." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07212009-040446/.

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8

Scott, David Andrew. "Estimating Soil Nitrogen Supply and Fertilizer Needs for Short-Rotation Woody Crops." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29402.

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Short-rotation woody crops are becoming important supplies of hardwood fiber, but little is known about the early nutritional needs of these systems, especially on different site types. The study objectives were, on two young (ages 3-6) sweetgum plantations with contrasting soil types, to 1) determine the plant growth and foliar nutrition response to repeated nitrogen (N) fertilizer applications, 2) determine soil N supply, plant N demand, foliar N resorption, and soil and fertilizer uptake efficiencies, and 3) test a simple N supply model. In order to expand the findings to the range of sweet

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9

Waddill, Dan W. "Nitrogen cycling in tall fescue turf with added clippings." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07212009-040500/.

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10

Watkins, Naomi K. "The influence of crops on gross rates of nitrogen mineralisation." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333588.

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11

Asebedo, Antonio Ray. "Development of sensor-based nitrogen recommendation algorithms for cereal crops." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19229.

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Doctor of Philosophy<br>Department of Agronomy<br>David B. Mengel<br>Nitrogen (N) management is one of the most recognizable components of farming both within and outside the world of agriculture. Interest over the past decade has greatly increased in improving N management systems in corn (Zea mays) and winter wheat (Triticum aestivum) to have high NUE, high yield, and be environmentally sustainable. Nine winter wheat experiments were conducted across seven locations from 2011 through 2013. The objectives of this study were to evaluate the impacts of fall-winter, Feekes 4, Feekes 7, and Feek

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12

Brown, Sarah K. "Managing symbiotically-fixed nitrogen on mined land for tree crops." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-11102009-020308/.

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13

Dawson, Julie C. "Breeding wheat for efficient nitrogen use in low-input and organic systems in the Pacific Northwest." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Dissertations/Spring2008/j_dawson_041708.pdf.

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14

Botha, Elizabeth Johanna. "Estimating nitrogen status of crops using non-destructive remote sensing techniques." Thesis, University of Limpopo, 2001. http://hdl.handle.net/10386/2562.

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15

Aronsson, Helena. "Nitrogen turnover and leaching in cropping systems with ryegrass catch crops /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/a214.pdf.

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16

Dean, Jill Elise. "Brassica cover crops for nitrogen retention in the Maryland Coastal Plain." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3818.

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Thesis (M.S.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Dept. of Natural Resource Sciences and Landscape Architecture. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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17

Doerge, Thomas A., Kevin H. Pritchard, and Ted W. McCreary. "Nitrogen Management in Drip Irrigated Leaf Lettuce, Spinach and Green Crops." College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/214500.

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Preliminary nitrogen (N) management experiments with spinach, leaf lettuce, romaine collard and mustard were conducted on a Casa Grande s.l. soil at the Maricopa Agricultural Center in the winter and spring of 1990-91. The purpose of this N rate experiment was to develop initial Best Management strategies for N fertilizer use for emerging high value crops grown in Arizona using subsurface drip irrigation. Three rates of urea, ammonium nitrate were applied to each cultivar to provide deficient (N1), adequate (N2) and supraoptimal real (N3) levels of N. All cultivars responded dramatically to th

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18

Islam, N. "Effects of nitrogen fertilizer on the growth and yield of oilseed rape (B. napus L.)." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379256.

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19

Smith, Chad Lee Smeda R. J. "Weed management and nitrogen loss in glyphosate-resistant corn (Zea mays)." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6568.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on January 22, 2010). Thesis advisor: Dr. Reid J. Smeda. Includes bibliographical references.

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20

Bair, Kyle Edward. "Effectively utilizing legume cover crops as an organic source of nitrogen in concord grape." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Fall2006/k_bair_110206.pdf.

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21

Weinberg, Naomi Hélène. "Improving nitrogen fertilizer recommendations for arable crops in the Lower Fraser Valley." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26664.

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A two year field study located in Delta Municipality, British Columbia, was conducted to investigate the possible improvement of nitrogen (N) fertilizer recommendations for arable crops in the Lower Fraser Valley (LFV). After reviewing current N fertilizer recommendation systems in other humid regions, the approach taken in the study was to determine the applicability of a spring soil test and/or a N Index system for the LFV region. The project, which used sweet corn (Zea Mays saccharata) as the trial crop, consisted of two interconnected parts: 1) A 'Replicated Fertilizer Response Trial' wh

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22

Monteil, Oscar Vazquez. "Wastewater irrigation of crops : the influence of nitrogen on soil-plant interactions." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303449.

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23

Schellenberg, Daniel Leo. "Nitrogen Management and Weed Suppression in Organic Transition." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31559.

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The objectives of this research were: 1) to quantify the amount of supplemental nitrogen (N) to maximize organic broccoli (Brassica olearcea var. italica) on transition soils, 2) to evaluate the ability of leguminous cover crops lablab (Dolichos lablab L.), soybean (Glycine max L.), sunn hemp (Crotalria juncea L.) and a sunn hemp and cowpea mixture (Vigna sinensis Endl.) to supply N and suppress weeds and, 3) to compare the effect on N availability and broccoli yield potential of incorporating cover crops with conventional tillage (CT) or mulching cover crops with no-tillage (NT) practices. B

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24

Doel, J. M. "Accumulation and recovery of nitrogen in mixed farming systems using legumes and other fertility building crops." Thesis, Coventry University, 2012. http://curve.coventry.ac.uk/open/items/9dd4b790-1672-4b0e-9104-09439ddde7a2/1.

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Fertility-building crops (FBCs) offer the opportunity to alleviate the costs of inorganic fertiliser by providing an alternative supply of available nitrogen (N) in soils. A survey of relevant literature reviewed the types of FBCs, their nitrogen accumulation potentials, residue characteristics, and subsequent release patterns. It also identified a paucity of data concerning the response of different species to UK climatic, soil, and management conditions. In order to investigate these relationships further pot and field trials were established in 2007 at the Royal Agricultural College, Cirenc

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25

Viktor, Aleysia. "Physiological and metabolic factors determining nitrogen use efficiency of tomato seedlings grown with elevated dissolved inorganic carbon and different nitrogen sources." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52999.

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Thesis (MSc)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: The aim of this study was to determine (l) the influence of elevated dissolved inorganic carbon (DIC) on the nitrogen use efficiencies (NUE) of tomato seedlings grown with different nitrogen sources, (2) how changes in the regulation and activities of nitrate reductase (NR), phosphoenolpyruvate carboxylase (PEPc), carbonic anhydrase (CA) and subsequent changes in metabolites would account for observed changes in NUE, and (3) to what extent elevated DIC contributed to the carbon budget of plants grown with different nitr

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26

Norris, Robert Brooke. "Winter Annual Cover Crops Interseeded into Soybean in Eastern Virginia: Influence on Soil Nitrogen, Corn Yield, and In-Season Soil Nitrogen Tests." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51173.

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The diverse cropping system of eastern Virginia's coastal plain offers limited opportunity to establish winter annual cover crops (WCC) for nitrogen (N) scavenging. The winter fallow niche after double-crop or full-season soybean (Glycine max L. Merr.) encompasses the majority of acres left fallow. Our objective was to evaluate interseeded WCC N scavenging performance following soybean and N supplying capacity to subsequent corn (Zea mays L.). Field studies were conducted at four different locations in each of the two study years. The experimental design was split plot with cereal rye, hai

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27

MURATORE, CHIARA. "CHARACTERIZATION OF PROTEOMIC CHANGES IN CROPS DURING METABOLIC ADAPTATION TO DIFFERENT NITROGEN INPUTS." Doctoral thesis, Università degli Studi di Milano, 2023. https://hdl.handle.net/2434/951273.

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Nitrogen availability is one of the major factors that influence plant growth, morphology, and metabolism and, hence, crop productivity. In agricultural soils, nitrogen is present in different forms, both inorganic (nitrate and ammonium) and organic (amino acids, short peptides and urea), with variable and heterogeneous distribution. Nowadays, improving knowledge about the nitrogen nutrition in plants is crucial to address the urgent need for a more sustainable agricultural production. In the last years, the “-omics” approaches provided a holistic perspective of the molecular mechanisms underl

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28

Cicek, Harun. "Optimizing the nitrogen supply of prairie organic agriculture with green manures and grazing." Elsevier, 2014. http://hdl.handle.net/1993/23852.

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Grazing and no-till management in organic systems have been recently proposed tools to improve nutrient cycling and sustainability. From 2008 to 2012 a series of field experiments were established to identify green manure species and green manure management options to maximize N benefit to following cash crops and explore the opportunities to reduce tillage during the green manure phase of an organic rotation. A total of four green manure systems (double-cropped green manures, relay-cropped green manures, full season green manures, and catch crops after grazed full season green manures), three

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29

Odhiambo, Jude Julius Owuor. "Effect of cereal/grass and legume cover crop monocultures and mixtures on the performance of fall-planted cover crops, soil mineral nitrogen and short-term nitrogen availability." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ34601.pdf.

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30

Haggar, Jeremy. "Nitrogen and phosphorus dynamics of systems integrating trees and annual crops in the tropics." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306403.

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31

Anfinrud, Robynn Elizabeth. "Nitrogen Uptake and Biomass and Ethanol Yield of Biomass Crops as Feedstock for Biofuel." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26524.

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Nitrogen fertilizers are extensively used to enhance the growth of biomass crops. This study was conducted to determine the effect of N rates on the biomass yield and quality, and N uptake of several crops. The experiment was conducted at Fargo and Prosper, ND, in 2010 and 2011. The crops studied were forage sweet sorghum [Sorghum bicolor L. Moench], sorghum x sudangrass [Sorghum bicolor var. sudanense (Piper) Stapf.], kenaf [Hibiscus cannabinus L.], and reed canarygrass [Phalaris arundinacea L.]. The different crops constituted the main plots and the nitrogen rates were regarded as subplots.

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32

Yu, Xing. "Role of soil pH on nitrogen and phosphorus fertilizer use efficiency in cereal crops." Thesis, The University of Sydney, 2023. https://hdl.handle.net/2123/29960.

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Soil pH plays an important role in soil nutrient dynamics and plant uptake, but its role in affecting nitrogen (REN) and phosphorus fertilizer use efficiency (REP) remains unclear. I used two meta-analyses to investigate the overall importance of soil pH and other factors for REN and REP, respectively in rice, wheat and maize. I found an average REN of 39%, and an average REP of 12%, based on 261 and 82 global studies, respectively. There was large variation among crops, as a result of different genotypes, growing conditions, soil characteristics, and fertilization rate. For REN, relationships

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33

Lindeque, Michelle Irene. "Diversity of root nodule bacteria associated with Phaseolus coccineus and Phaseolus vulgaris species in South Africa." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-02162007-170945.

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34

Massignam, Angelo Mendes. "Quantifying nitrogen effects on crop growth processes in maize and sunflower /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17639.pdf.

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35

Isse, Abdullahi. "Capacity of cover crops to capture excess fertilizer and maintain soil efficiency." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0021/MQ37132.pdf.

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36

Medeiros, João A. S. "Management alternatives for urea use in corn and wheat production." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4533.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 9, 2007) Includes bibliographical references.

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37

Shelton, Rebecca Erin. "CONSERVATION AGRICULTURE IN KENTUCKY: INVESTIGATING NITROGEN LOSS AND DYNAMICS IN CORN SYSTEMS FOLLOWING WHEAT AND HAIRY VETCH COVER CROPS." UKnowledge, 2015. http://uknowledge.uky.edu/pss_etds/59.

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Unintentional nitrogen (N) loss from agroecosystems produces greenhouse gases, induces eutrophication, and is costly for farmers; therefore, adoption of conservation agricultural management practices, such as no-till and cover cropping, has increased. This study assessed N loss via leaching, NH3 volatilization, N2O emissions, and N retention in plant and soil pools of corn conservation agroecosystems across a year. Three systems were evaluated: 1) an unfertilized organic system with cover crops Vicia villosa, Triticum aestivum, or a mix of the two; 2) an organic system with a Vicia cover crop

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38

Andersson, Allan. "Nitrogen redistribution in spring wheat : root contribution, spike translocations and protein quality /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2005. http://epsilon.slu.se/200510.pdf.

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39

Cobb, Chester Ray. "Estimating Nitrogen Efficiency of Swine Lagoon Liquid Applied to Field Crops Using Continuously Variable Irrigation." NCSU, 2002. http://www.lib.ncsu.edu/theses/available/etd-05082002-125033/.

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Application of anaerobic swine (Sus scrofa domesticus) lagoon liquid onto cropland by irrigation is a common method of waste disposal and treatment. Currently, the application rate of swine lagoon liquid is based on the N concentration of the lagoon liqu id and the N required by the receiver crop to obtain a realistic yield. In North Carolina, only 50% of the total N in the swine lagoon liquid applied by irrigation is considered available for plant use during the first year after application. Uncertaint y exists as to whether this coefficient accurately predicts the amount of plant-available N

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40

Bunyolo, A. M. "Effects of fertilizer nitrogen and water supply on growth and yield of the potato crops." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379220.

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41

McClanahan, Sarah Jane. "Evaluation of Cover Crops, Conservation Tillage, and Nitrogen Management in Cotton Production in Southeastern Virginia." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89921.

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The response of upland cotton (Gossypium hirsutum L.) to legume and small grain cover crop establishment, in-season nitrogen (N) rate, and fertilizer N placement was investigated in two experiments located in coastal plain Virginia and North Carolina. The first experiment examined 1) soil compaction and cotton yield response to strip-tillage compared to no-tillage with a precision planted tillage radish and 2) the influence of legume mix, rye, and legume mix/rye combination cover crops with four in-season nitrogen (N) rates applied to cotton on cover crop biomass, cover crop nutrient uptake, s

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42

Kyllmar, Katarina. "Nitrogen leaching in small agricultural catchments : modelling and monitoring for assessing state, trends and effects of counter-measures /." Uppsala : Dept. of Soil Sciences, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a485.pdf.

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43

Hudson, Donna. "Analysis of the effects of treatments on non-linear models for nitrogen response curves, with implications for design." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360011.

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44

Preza, Fontes Giovani. "Managing cover crops and nitrogen fertilization to enhance sustainability of sorghum cropping systems in eastern Kansas." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35267.

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Master of Science<br>Department of Agronomy<br>Peter J. Tomlinson<br>Growing cover crops (CCs) in rotation with cash crops has become popular in recent years for their many agroecosystem benefits, such as influencing nutrient cycling and reducing nutrient losses. This study aimed to (i) determine the long-term effects of no-till with CCs and varying nitrogen (N) rates on subsequent sorghum [Sorghum bicolor (L.) Moench] yield and yield components, (ii) assess how CCs affect the N dynamic in the soil-crop relationship during the growing season and N use efficiency (NUE) of sorghum, and (iii) def

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45

Gacengo, Catherine N. Wood C. W. Shaw Joey N. "Agroecosystem management effects on carbon and nitrogen cycling across a coastal plain catena." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SUMMER/Agronomy_and_Soils/Dissertation/Gacengo_Catherine_2.pdf.

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46

Båth, Birgitta. "Matching the availability of N mineralised from green-manure crops with the N-demand of field vegetables /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5754-8.pdf.

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47

Challinor, Paul Francis. "An evaluation of pumice, unloaded clinoptilolite and nutrient-loaded clinoptilolite zeolites, as plant growth substrates in the intensive production of long season glasshouse crops." Thesis, University of Plymouth, 2003. http://hdl.handle.net/10026.1/2625.

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Annual losses of nitrogen from existing glasshouse crop production substrate systems could be as high as 600 kg ha 1, using an average of 30% drainwater containing a nitrate-nitrogen concentration of 200 mg 1". The use of nutrient recirculation systems such as nutrient film technique (NFT) helped to reduce nutrient losses to the environment but the commercial area of NFT has decreasedd ue to high initial capital costs, concernso ver diseaset ransmissionw ithin the system and an absence of recent research and development. Most substrate systems rely on the provision of liquid nutrient feed

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48

Sciarresi, Cintia Soledad. "OPTIMIZING COVER CROP ROTATIONS FOR WATER, NITROGEN AND WEED MANAGEMENT." UKnowledge, 2019. https://uknowledge.uky.edu/pss_etds/122.

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Winter cover crops grown in rotation with grain crops can be an efficient integrated pest management tool (IPM). However, cover crop biomass production and thus successful provisioning of ecosystem services depend on a timely planting and cover crop establishment after harvest of a cash crop in the fall. One potential management adaptation is the use of short-season soybeans to advance cover crop planting date in the fall. Cover crops planted earlier in the fall may provide a greater percentage of ground cover early in the season because of higher biomass accumulation that may improve weed sup

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49

Mahama, George Yakubu. "Impact of cover crops and nitrogen application on nitrous oxide fluxes and grain yield of sorghum and maize." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18939.

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Doctor of Philosophy<br>Department of Agronomy<br>P. V. Vara Prasad<br>Leguminous cover crops systems have been envisaged as a critical component of sustainable agriculture due to their potential to increase soil productivity through cycling of carbon (C) and nitrogen (N) in agricultural systems. The objectives of this study were to evaluate the performance of leguminous summer cover crops; cowpea [Vigna unguiculata (L.) Walp.], pigeon pea [Cajanus cajan (L.) Millsp], sunn hemp (Crotalaria juncea L.) and double-cropped grain crops; grain sorghum [Sorghum bicolor (L.) Moench] and soybean [Glyci

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50

Pavuluri, Kiran. "Winter Barley as a Commodity Cover Crop in the Mid-Atlantic Coastal Plain and Evaluation of Soft Red Winter Wheat Nitrogen Use Efficiency by Genotype, and its Prediction of Nitrogen Use Efficiency through Canopy Spectral Reflectance in the Eastern US." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/47103.

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To understand the impact of N management on harvestable cover crop systems, seven research trials compared: 1) standard intensive management (SIM) (both fall and spring N application), 2) No fall N, a single spring N application, and 3) Cover N (no N application) effects on winter barley (Hordeum vulgare L.) plant biomass (PB), plant N uptake (PNU), grain yield, residual soil nitrate (RSN), and ammonium (RSA). In general, at winter dormancy, SIM resulted in increased PB and PNU but not RSN or RSA. At cover crop termination; SIM and the No fall N practices increased PNU, and at harvesting sta

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