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dc.contributor.authorBamber, Kevin Williamen_US
dc.date.accessioned2016-07-28T06:00:24Z
dc.date.available2016-07-28T06:00:24Z
dc.date.issued2015-02-03en_US
dc.identifier.othervt_gsexam:4280en_US
dc.identifier.urihttp://hdl.handle.net/10919/71870
dc.description.abstractEnvironmental concerns about winter nitrogen (N) leaching loss limit the amount of biosolids applied to winter small grains in Virginia. Ten field studies were established 2012-2014 in Virginia to determine the agronomic and environmental feasibility of fall biosolids applications to soft red winter wheat (Triticum aestivum L.). Eight studies were located in the Coastal Plain physiographic province and two in the Ridge and Valley physiographic province. The effects of eight biosolids and urea N treatments on 1) biomass production at Zadoks growth stage (GS) 25-30, 2) soil inorganic N at GS 25-30, 3) soil mineralizable N at GS 25-30,4) N use efficiency (NUE) at GS 58, 5) grain yield, 6) end-of-season soil inorganic N, and 7) estimated N recovery were studied. Anaerobically digested (AD) and lime stabilized (LS) biosolids were fall applied at estimated plant available N (PAN) rates of 100 kg N ha-1 and 50 kg N ha-1. The 50 kg N ha-1 biosolids treatments were supplemented with 50 kg N ha-1 as urea in spring. Urea N was split applied at 0, 50, 100 and 150 kg N ha-1, with 1/3 applied in fall and 2/3 in spring. Biomass at GS 25-30 increased with urea N rate and biosolids always resulted in equal or greater biomass than urea. Soil mineralizable N at GS 25-30 rarely responded to fall urea or biosolids N rate, regardless of biosolids type. Biosolids and urea applied at the agronomic N rate resulted in equal grain yield and estimated N recovery in soils where N leaching loss risk was low, regardless of biosolids type or application strategy. Lime stabilized biosolids and biosolids/urea split N application increased grain yield and estimated N recovery in soils with high or moderate N leaching loss risk. Therefore, AD and LS biosolids can be fall-applied to winter wheat at the full agronomic N rate in soils with low N leaching loss risk, while LS biosolids could be applied to winter wheat at the full agronomic N rate in soils with moderate or high N leaching loss risk.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectagronomic nitrogen rateen_US
dc.subjectammoniumen_US
dc.subjectbiomassen_US
dc.subjectbiosolidsen_US
dc.subjectcoarse-textured soilsen_US
dc.subjectdenitrificationen_US
dc.subjectfall applicationen_US
dc.subjectfine-textured soilsen_US
dc.subjectgrain yielden_US
dc.subjectinorganic nitrogenen_US
dc.subjectleachingen_US
dc.subjectleaching loss risken_US
dc.subjectmineralizable nitrogenen_US
dc.subjectmineralizationen_US
dc.subjectnitrateen_US
dc.titleNitrogen Cycling from Fall Applications of Biosolids to Winter Small Grainsen_US
dc.typeThesisen_US
dc.contributor.departmentCrop and Soil Environmental Sciencesen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineCrop and Soil Environmental Sciencesen_US
dc.contributor.committeechairEvanylo, Gregory K.en_US
dc.contributor.committeememberFox, Thomas R.en_US
dc.contributor.committeememberThomason, Wade Everetten_US


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