393-21 Effects of Swine Manure Application Time and Instinct On Corn Growth and Mineralizable Nitrogen On Two Indiana Soils.

Poster Number 1512

See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nitrogen Use Efficiency and Management
Wednesday, October 24, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1
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Min Xu1, Brad Joern2 and James J. Camberato2, (1)Purdue University, West Lafayette, IN
(2)Agronomy, Purdue University, West Lafayette, IN
The growing concern of N loss due to nitrate leaching, denitrification, and the rising cost of N fertilizers has led to increased interest in the use nitrification inhibitors with manure. A field study was initiated in 2011 to evaluate the impact of swine manure application timing and InstinctTM, a microencapsulated form of the nitrification inhibitor nitrapyrin, on corn growth and yield at two locations in Central Indiana. Treatments in this field study were: manure application in August, September, October, March, and April; manure plus InstinctTM (2.6 L/ha) application in October, March and April; and three commercial fertilizer application rates (134 kg N/ha, 179 kg N/ha, 224 kg N/ha) applied in the spring either as preplant anhydrous ammonia (location 1) or sidedress injected urea ammonium nitrate solution (location 2). Swine manure was subsurface injected at 65,500 L/ha at both locations. Due to differences in manure analyses, total N and estimated potentially available N application rates were 420 kg/ha and 340 kg/ha at location 1 and 240 kg/ha and 200 kg/ha at location 2. Whole plant samples were taken at the V6 growth stage and ear leaves were collected at the R1 growth stage. We also collected soil samples (0-30 cm and 30-60 cm) in December 2011 from treatments that had received manure and one treatment that had not yet received manure, and we conducted an incubation study to determine differences in soil N mineralization potential from these samples. Additional soil samples were collected in April and June of 2012. The results of both field and incubation studies will be presented in this poster.
See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Nitrogen Use Efficiency and Management