Influence of Late- Influence of Late- Season Foliar Nitrogen Season Foliar Nitrogen Applications on Grain Applications on Grain Protein in Winter Wheat Protein in Winter Wheat C.W. Woolfolk, W.R. Raun, G.V. Johnson E.G. Krenzer, and W.E. Thomason Oklahoma State University Oklahoma State University Department of Plant and Soil Sciences Department of Plant and Soil Sciences
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Influence of Late-Season Foliar Nitrogen Applications on Grain Protein in Winter Wheat
Influence of Late-Season Foliar Nitrogen Applications on Grain Protein in Winter Wheat. C.W. Woolfolk, W.R. Raun, G.V. Johnson E.G. Krenzer, and W.E. Thomason. Oklahoma State University Department of Plant and Soil Sciences. Introduction. - PowerPoint PPT Presentation
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Influence of Late-Season Influence of Late-Season Foliar Nitrogen Applications Foliar Nitrogen Applications
on Grain Protein in Winter on Grain Protein in Winter WheatWheat
Influence of Late-Season Influence of Late-Season Foliar Nitrogen Applications Foliar Nitrogen Applications
on Grain Protein in Winter on Grain Protein in Winter WheatWheat
C.W. Woolfolk, W.R. Raun, G.V. Johnson E.G. Krenzer, and W.E. Thomason
C.W. Woolfolk, W.R. Raun, G.V. Johnson E.G. Krenzer, and W.E. Thomason
Oklahoma State UniversityOklahoma State UniversityDepartment of Plant and Soil SciencesDepartment of Plant and Soil Sciences
Oklahoma State UniversityOklahoma State UniversityDepartment of Plant and Soil SciencesDepartment of Plant and Soil Sciences
IntroductionIntroductionIntroductionIntroduction Increasing grain protein in higher yielding wheat
varieties while maintaining yields is often difficult Efficient utilization of nitrogen fertilizers is imperative
for human nutrition (Smil 1997) Grain protein increases occur when foliar nitrogen is
applied at anthesis and rapidly declines before or after that time (Finney et al., 1957)
Gaseous nitrogen losses from wheat leaves occurs between anthesis and maturity (Harper et al., 1987)
Maximum N accumulation generally occurs at flowering
Increasing grain protein in higher yielding wheat varieties while maintaining yields is often difficult
Efficient utilization of nitrogen fertilizers is imperative for human nutrition (Smil 1997)
Grain protein increases occur when foliar nitrogen is applied at anthesis and rapidly declines before or after that time (Finney et al., 1957)
Gaseous nitrogen losses from wheat leaves occurs between anthesis and maturity (Harper et al., 1987)
Maximum N accumulation generally occurs at flowering
ObjectivesObjectivesObjectivesObjectives
To determine the effects of late-season nitrogen applications at four rates and two N sources on:
grain yield grain protein straw yield straw N
To determine the effects of late-season nitrogen applications at four rates and two N sources on:
grain yield grain protein straw yield straw N
Materials and MethodsMaterials and MethodsMaterials and MethodsMaterials and Methods
Application type simulated aerial 175 ml mechanically pressurized spray bottles
Nitrogen source Urea Ammonium Nitrate: no dilution-28% N Ammonium Sulfate: 700g in 1,000ml H20-11%N
Wheat (Triticum aestivum L.) “Tonkawa” hard red winter
Cropping system conventional tillage
Application type simulated aerial 175 ml mechanically pressurized spray bottles
Nitrogen source Urea Ammonium Nitrate: no dilution-28% N Ammonium Sulfate: 700g in 1,000ml H20-11%N
Wheat (Triticum aestivum L.) “Tonkawa” hard red winter
Cropping system conventional tillage
Materials and MethodsMaterials and MethodsMaterials and MethodsMaterials and Methods
Experimental sites: Efaw, OK and Perkins,OK Experimental design: RCBD, 4 replications
Plot size: 7.43 m2
N Source and rate: UAN: 0, 11, 22, 33, 44 kg N ha-1 AS: 22 kg N ha-1
Timing of application: Pre-flowering: Feekes 10.5 Post-flowering: Feekes 10.5.4
Experimental sites: Efaw, OK and Perkins,OK Experimental design: RCBD, 4 replications
Plot size: 7.43 m2
N Source and rate: UAN: 0, 11, 22, 33, 44 kg N ha-1 AS: 22 kg N ha-1
Timing of application: Pre-flowering: Feekes 10.5 Post-flowering: Feekes 10.5.4
Future ResearchFuture ResearchFuture ResearchFuture Research
More in-depth focus on post-flowering More in-depth focus on post-flowering applicationsapplications
Alternative methods for increasing yield Alternative methods for increasing yield while increasing protein-(KHwhile increasing protein-(KH22POPO44) applied ) applied
to delay senescenceto delay senescence Focus on products which decrease N Focus on products which decrease N
losses and can be applied simultaneously losses and can be applied simultaneously with foliar N applicationswith foliar N applications
More in-depth focus on post-flowering More in-depth focus on post-flowering applicationsapplications
Alternative methods for increasing yield Alternative methods for increasing yield while increasing protein-(KHwhile increasing protein-(KH22POPO44) applied ) applied
to delay senescenceto delay senescence Focus on products which decrease N Focus on products which decrease N
losses and can be applied simultaneously losses and can be applied simultaneously with foliar N applicationswith foliar N applications