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Charles H. Burmester Extension Agronomist Auburn University

Effect of Surface Application of Nitrogen Fertilizer Sources on Cotton Yields and Quality in A Conservation Tillage System. Charles H. Burmester Extension Agronomist Auburn University. Test Information. Location: Tenn. Valley Research and Extension Center

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Charles H. Burmester Extension Agronomist Auburn University

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  1. Effect of Surface Application of Nitrogen Fertilizer Sources on Cotton Yields and Quality inA Conservation TillageSystem Charles H. Burmester Extension Agronomist Auburn University

  2. Test Information • Location: Tenn. Valley Research and Extension Center • Soil Type: Decatur Silt Loam • Variety : DP&L 454 Bt/RR • Tillage : No-Till Wheat Cover • Planting Date: April 24th • Preplant N : 24lb/A • Plot Area: Irrigated

  3. Fertilizers • 34% Ammonium Nitrate • 46% Urea • 44.6% Urea + Calcium Thiosulfate 4.5% • 42.3% Urea + Calcium Thiosulfate 7.0% • 46% Urea + Agrotain(1 gal/Ton)

  4. N RATES 60, 90 LB/A Surface Applied June 5th Rainfall 0.51 inch June 12th Cotton 4-5 Leaf Stage

  5. Fertilizers

  6. Fertilizers

  7. Fertilizers

  8. Fertilizers

  9. Cover Crop

  10. TEST SITE

  11. Data Collected • Cotton leaf samples in mid July - cotton in 3rd week of bloom • NAWF measurement in early August • Cotton yields and quality

  12. Pre-Harvest Data LSD (0.05 =.75 LSD (.05) = 0.23

  13. Pre-Harvest Data • Nutrient analysis of cotton leaves revealed no differences due to treatment in concentration of P, K, Ca or Mg. • P levels averaged 0.27% • K levels averaged 1.75% • Mg levels averaged 0.34% • Ca levels averaged 1.50%

  14. Seed Cotton Yields LSD (0.05) =269 CV = 5.4% a a a a c b b bc bc bc c

  15. Cotton Quality

  16. Conclusions • Increasing N fertilizer rates from 60 to 90 lb/A increased NAWF, Leaf N, and yields with all N sources. • Cotton yields using Agrotain and Thiosulfate fertilizers were not significantly different than Ammonium Nitrate in this test.

  17. Conclusions • Cotton yields using urea fertilizer were significantly lower than yields produced using ammonium nitrate at both N fertilizer rates. • Agrotain and thiosulfate fertilizers produced significantly higher cotton yields than urea fertilizer at the 90 lb/A rate of N fertilizer.

  18. Conclusions • Both Agrotain and the Thiosulfate fertilizers tested may be useful in reducing N loss from urea under a high residue conservation tillage cotton system.

  19. Acknowledgement • Thanks to Joe Duck with Agrotain International and John Clapp with Tessenderlo Kerley for their product support

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