Response of cotton to green manuring and different fertility levels under rainfed condition
DOI:
https://doi.org/10.59797/ija.v70i1.5750Keywords:
Cotton, Cowpea, Dhaincha, Fertility levels, Green manuring, Seed cotton yield, SunhempAbstract
A field experiment was conducted during the rainy (Kharif) seasons of 2018-19, 2019-20 and 2020-21 at the College of Agriculture, Bharuch to study the effect of green manure crop and different fertility levels on cotton growth, yield and soil health under rainfed condition. The experiment consisted of twelve treatment combinations with four green manure crops i.e. sunhemp, dhaincha, cowpea, and control and three fertilizer levels i.e. 50, 75, and 100 % of RDF (80: 0: 0 NPK kg/ha). The treatments were replicated thrice in randomized block design with factorial concept. Growth and yield parameters like plant height, branches/plant, no. of boll/plant seed cotton yield (g/plant and kg/plant), stalk and biological yield, lint and seed yield of cotton were improved considerably with the application of 80 kg N/ha in two equal splits at 30 and 60 DAS. Green manures failed to exert a significant effect on cotton performance, however it significantly improved the soil available nitrogen, phosphorus and organic carbon as compared to control (no green manure). Treatment combination of control (no green manuring) + 100 % RDF (80-0-0 kg NPK/ha) recorded maximum seed cotton yield (2604 kg/ha), net realization (₹ 113184/ha) and B:C ratio (3.8) as compared to the rest of the interactions. However, treatment combination of dhaincha as green manuring + 75% RDF or 100 % RDF (80-0-0 kg NPK/ha) significantly increased the soil organic carbon as compared to rest of the treatment combinations.
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