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Precision Nitrogen Management in Bt Cotton (Gossypium hirsutum) Improves Seed Cotton Yield and Nitrogen Use Efficiency, and Reduces Nitrous Oxide Emissions
Field experiments were conducted to establish precision N management technology for nitrogen (N) topdressings in Bt (Bacillus thuringiensis) cotton (Gossypium hirsutum) along with the quantification of nitrous oxide emissions from the soil. The treatments consisted of five fixed N rates (0, 60, 90, 120 and 150 kg N ha−1 applied in two split doses) and eight site-specific N management (SSNM) treatments of applying different N rates at 40 days after sowing (DAS) and the application of leaf colour chart (LCC)-guided 30, 45 or 60 kg N ha−1 at 55 DAS only in four treatments and at both 55 and 85 DAS (first flowering and boll formation stages) in the remaining four treatments. A higher R2 value between the total N uptake and the leaf N concentration at 85 DAS than at 55 DAS strongly suggested that fertilizer N management based on leaf N concentration measured in terms of LCC scores led to an adequate total N uptake resulting in a respectable yield. Topdressings of 45 to 60 kg N ha−1 at 40 DAS and an LCC-based application at 55 DAS produced seed cotton yields on a par with the addition of 150 kg N ha−1 based on a soil test basis along with an improved recovery and agronomic efficiency use, and remarkably lowered the nitrous oxide emissions as estimated using the CCAFS (Climate Change, Agriculture and Food Security)-Mitigation Option Tool.
Precision Nitrogen Management in Bt Cotton (Gossypium hirsutum) Improves Seed Cotton Yield and Nitrogen Use Efficiency, and Reduces Nitrous Oxide Emissions
Field experiments were conducted to establish precision N management technology for nitrogen (N) topdressings in Bt (Bacillus thuringiensis) cotton (Gossypium hirsutum) along with the quantification of nitrous oxide emissions from the soil. The treatments consisted of five fixed N rates (0, 60, 90, 120 and 150 kg N ha−1 applied in two split doses) and eight site-specific N management (SSNM) treatments of applying different N rates at 40 days after sowing (DAS) and the application of leaf colour chart (LCC)-guided 30, 45 or 60 kg N ha−1 at 55 DAS only in four treatments and at both 55 and 85 DAS (first flowering and boll formation stages) in the remaining four treatments. A higher R2 value between the total N uptake and the leaf N concentration at 85 DAS than at 55 DAS strongly suggested that fertilizer N management based on leaf N concentration measured in terms of LCC scores led to an adequate total N uptake resulting in a respectable yield. Topdressings of 45 to 60 kg N ha−1 at 40 DAS and an LCC-based application at 55 DAS produced seed cotton yields on a par with the addition of 150 kg N ha−1 based on a soil test basis along with an improved recovery and agronomic efficiency use, and remarkably lowered the nitrous oxide emissions as estimated using the CCAFS (Climate Change, Agriculture and Food Security)-Mitigation Option Tool.
Precision Nitrogen Management in Bt Cotton (Gossypium hirsutum) Improves Seed Cotton Yield and Nitrogen Use Efficiency, and Reduces Nitrous Oxide Emissions
Rajeev Kumar Gupta (author) / Arun Shankar (author) / Bijay-Singh (author) / Rajan Bhatt (author) / Asma A. Al-Huqail (author) / Manzer H. Siddiqui (author) / Ritesh Kumar (author)
2022
Article (Journal)
Electronic Resource
Unknown
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