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Soil samples were taken before fertilizer application and planting. For phosphorus, soil samples were analyzed after extraction with water, Mehlich 3, TAMU, and a new extractant, which is under development at our lab. TAMU and Mehlich 3 indicated that no P fertilizer was necessary; however, the new extractant indicated that corn would respond to a P addition. Due to the lack of rain, the yields are down from last year's harvest. The following are the results:
Corn Yields
- Plots with no fertilizer:
yield 52 bu/ac Increasing nitrogen rate:
- 28 lbs N, 20 lbs P205: yield 57 bu/ac
- 73 lbs N, 20 lbs P205: yield 64 bu/ac
- 130 lbs N, 20 lbs P205: yield 70 bu/ac
Increasing phosphorus rate:
- 100 lbs N, 0 lbs P205: yield 66 bu/ac
- 100 lbs N 38 lbs P205: yield 74 bu/ac
- 100 lbs N 53 lbs P205: yield 76 bu/ac
Please send comments and/or questions to:
rhaney@spa.ars.usda.gov
254-770-6503
Rick L. Haney
Soil Scientist
Grassland Soil & Water Res. Lab808 E. Blackland RoadTemple, TX 76502
