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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
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Charles H. Burmester Extension Agronomist Auburn University

Jan 15, 2016

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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 - PowerPoint PPT Presentation
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Page 1: Charles H. Burmester Extension Agronomist Auburn University

Effect of Surface Application of Nitrogen Fertilizer Sources on

Cotton Yields and Quality inA Conservation Tillage

System

Charles H. Burmester

Extension Agronomist

Auburn University

Page 2: Charles H. Burmester Extension Agronomist Auburn University

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

Page 3: Charles H. Burmester Extension Agronomist Auburn University

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)

Page 4: Charles H. Burmester Extension Agronomist Auburn University

N RATES

60, 90 LB/A

Surface Applied June 5th

Rainfall 0.51 inch June 12th

Cotton 4-5 Leaf Stage

Page 5: Charles H. Burmester Extension Agronomist Auburn University

Fertilizers

Page 6: Charles H. Burmester Extension Agronomist Auburn University

Fertilizers

Page 7: Charles H. Burmester Extension Agronomist Auburn University

Fertilizers

Page 8: Charles H. Burmester Extension Agronomist Auburn University

Fertilizers

Page 9: Charles H. Burmester Extension Agronomist Auburn University

Cover Crop

Page 10: Charles H. Burmester Extension Agronomist Auburn University

TEST SITE

Page 11: Charles H. Burmester Extension Agronomist Auburn University

Data Collected

• Cotton leaf samples in mid July - cotton in 3rd week of bloom

• NAWF measurement in early August

• Cotton yields and quality

Page 12: Charles H. Burmester Extension Agronomist Auburn University

Pre-Harvest DataTreatment NAWF %N

60 Amm-Nit 4.3 abc 3.67 cd

60 Urea 3.8 bcd 3.41 e

60 U-Cats-4.5 3.7 bcd 3.43 e

60 U-Cats-7.0 3.6 cd 3.41 e

60 U-Agrotain 3.5 d 3.48 de

90 Amm-Nit 4.7 a 3.98 ab

90 Urea 3.9 bcd 3.85 abc

90 U-Cats-4.5 4.1 abcd 3.93 ab

90-U-Cats-7.0 4.0 abcd 3.81 bc

90-U-Agrotain 4.4 ab 4.04 aLSD (0.05 =.75 LSD (.05) = 0.23

Page 13: Charles H. Burmester Extension Agronomist Auburn University

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%

Page 14: Charles H. Burmester Extension Agronomist Auburn University

Seed Cotton Yields

1500170019002100230025002700290031003300350037003900

Amm Nit Urea U-Cats-4.5 U-Cats-7.0 U-Agrotain

60

90

b

ac

c

bbc

a

bc

a

bc

a

LSD (0.05) =269CV = 5.4%

Page 15: Charles H. Burmester Extension Agronomist Auburn University

Cotton QualityTreatments Mic Len Str. Unif Lint%

60 Amm-N 4.67 1.09 28.6 82.8 0.46

60 Urea 4.40 1.10 28.8 83.3 0.46

60 U-Cats-4.5% 4.30 1.10 29.1 83.1 0.46

60 U-Cats-7.0% 4.30 1.10 28.7 83.1 0.47

60 U-Agrotain 4.37 1.11 28.9 83.0 0.46

90 Amm-N 4.50 1.10 28.7 82.7 0.46

90 Urea 4.50 1.10 28.6 83.2 0.46

90 U-Cats-4.5% 4.53 1.11 28.9 83.3 0.46

90 U-Cats-7.0% 4.60 1.09 29.1 83.0 0.46

90 U-Agrotain 4.57 1.10 27.9 82.5 0.45

Page 16: Charles H. Burmester Extension Agronomist Auburn University

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.

Page 17: Charles H. Burmester Extension Agronomist Auburn University

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.

Page 18: Charles H. Burmester Extension Agronomist Auburn University

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.

Page 19: Charles H. Burmester Extension Agronomist Auburn University

Acknowledgement

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