EFFICACY OF NEEM COATED UREA THROUGH NITROGEN USE EFFICIENCY METHODS IN BT COTTON UNDER RAINFED VERTISOLS

Q4 Environmental Science

Pollution Research Pub Date : 2023-01-01 DOI:10.53550/pr.2023.v42i01.026

D. Kalyani, K. Narayanan, A. Sharma, M. Krishna, K. Ramanamma, K. A. Kumar

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Abstract

A scientific field experiment was conducted during 2017, 2018 and 2019 in kharif season at R.A.R.S, Nandyal, Acharya N.G. Ranga Agricultural University to study Efficacy of Neem coated urea through nitrogen use efficiency methods in Bt cotton. The experiment consisting of seven nitrogen use efficiency treatments with combination of three nitrogen doses viz: No nitrogen, 75% recommended dose of nitrogen, 100% recommended dose of nitrogen, 2 methods of nitrogen application viz: band application and split application and 4 stages of nitrogen top dressing viz: basal, squaring, flowering and boll development stages along with foliar application of 1% urea at squaring, flowering, boll development stage with RBD design and replicated thrice. The results indicated that pooled seed cotton yield (2813 kg/ha), nutrient uptake and cotton economics were higher with spot application 75% recommended dose of nitrogen with 4 split doses of nitrogen along with foliar application of 1% urea at squaring, flowering and boll developmental stage and was on par with spot application of 75% recommended dose of nitrogen with 4 split doses of nitrogen, foliar application of 1% urea at squaring, flowering and boll developmental stage along with incorporation of fodder cowpea before flowering (2681 kg/ ha). Lower seed cotton yield (1637 kg/ ha) was recorded with no nitrogen treatment.

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氮素利用效率法测定印楝包覆尿素在旱作棉田上的效果

于2017年、2018年和2019年秋收季节，在印度兰加农业大学南迪亚尔的R.A.R.S进行田间科学试验，通过氮素利用效率方法研究印楝包膜尿素在Bt棉上的效果。试验包括7个氮肥利用效率处理，分别为不施氮、75%推荐施氮、100%推荐施氮3种施氮剂量，2种施氮方法(带状施和分施)和4期氮肥追肥。按RBD设计，重复3次，在立交期、开花期和结铃期叶面施用1%尿素。结果表明，在拔节、开花期和铃发育期，当场施用75%推荐量的氮肥配4次分施氮肥，叶面施用1%尿素，能显著提高棉花总产量(2813 kg/ha)、养分吸收量和棉花经济效益，与当场施用75%推荐量的氮肥配4次分施氮肥、叶面施用1%尿素的效果相当。开花期和棉铃发育阶段，花前添加饲料豇豆(2681公斤/公顷)。无氮肥处理籽棉产量较低(1637 kg/ hm2)。

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Pollution Research Environmental Science-Water Science and Technology

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期刊介绍： POLLUTION RESEARCH is one of the leading enviromental journals in world and is widely subscribed in India and abroad by Institutions and Individuals in Industry, Research and Govt. Departments.