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Effect of Enhanced Efficiency N Fertilizers and Additives On Leaf N Concentration and Biomass N Content of Grain Sorghum.

Poster Number 2007

Monday, November 4, 2013
Tampa Convention Center, East Hall, Third Floor

Dennis L. Coker1, Mark L. McFarland2 and Tony L. Provin1, (1)Soil and Crop Sciences, Texas A&M Agrilife Extension Service, College Station, TX
(2)Soil and Crop Sciences, Texas A&M AgriLife Extension Service, College Station, TX

Grain sorghum is widely grown in Texas and ranks the second most important crop grown for feed and bio-fuel feedstock in the United States.  Finding ways to improve the management of input costs of N fertilizer is critical for maintaining the economic viability of sorghum production when costs of conventional N sources remain high.  Properly managed, slow-release N fertilizers have the potential to enhance plant recovery, thus improving N use efficiency in grain sorghum and reducing N losses to water resources.  Field studies were initiated in the Central Texas Blackland Region with moderate residual N level as determined by soil sampling to 1.22 m.  Fertility treatments included a control or 0 N added, 34, 67, 101, and 134 kg of N per ha added using liquid urea ammonium nitrate (UAN) alone or in combination with a urease-nitrification inhibitor product surface and subsurface-band applied at planting to stage two.  Additional treatments included the application of 34, 67, and 101 kg per ha of granular urea and two slow-release N sources surface-band applied at planting to stage two.  Experimental units were arranged in a randomized complete block design and replicated five times.  Measurements of fully-expanded leaf N concentration at flowering and total N uptake in biomass and grain at grain maturity were collected during the season.  Grain yield, test weight and moisture were assessed at final harvest.

See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Enhanced Efficiency Nitrogen Sources

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