Performance of Bt. (Bacillus thuringiensis) cotton–A real time crop evapotranspiration based fertigation approach
DOI:
https://doi.org/10.59797/ija.v70.i3.5624Keywords:
Cotton, Drip fertigation, Evapotranspiration, Productivity, Profitability, Water use efficiencyAbstract
Bacillus thuringiensis (Bt) cotton hybrid was used as test material to conduct an experiment during kharif 2020 and 2021 in split plot design with three replications to evaluate the fertigation levels. Four irrigation levels, viz. drip irrigation at 1.0, 0.8 and 0.6 Crop Evapotranspiration (ETc), and Conventional Method (CM) of irrigation as main plot while, sub-plot treatments consisted four nutrient levels, viz. Recommended dose of fertilizers (RDF) 175:60:60 (N:P:K), 75% of RDF, 50% of RDF and Control. Significantly higher seed cotton yield was recorded under drip irrigation at 1.0 ETc (2.42 and 1.42 t/ha) and 0.8 ETc (2.38 and 1.40 t/ha) over conventional method (CM) of irrigation (2.23 and 1.27 t/ha) during 2020 and 2021, respectively. The highest bolls per plant (36.5) were produced under drip irrigation at 1.0 ETc which were statistically similar to drip irrigation at 0.8 ETc and CM; which were significantly higher than at 0.6 ETc during 2020. Seed cotton yield produced at RDF (2.60 and 1.62 t/ha) and 75 % of RDF (2.53 and 1.59 t/ha) were statistically similar but significantly higher than 50% RDF (2.33 and 1.35 t/ ha) and control (1.72 and 0.72 t/ha) during 2020 and 2021. The total irrigation water use in Bt. cotton was reduced by 13.8-15.1 and 8.6-9.5 per cent while WUE increased by 24.7 and 18.6 percent under drip irrigation at 0.8 and 1.0 ETc, respectively, in comparison to CM. The highest net returns were recorded under nutrient levels @ 75% of RDF under drip irrigation at 1.0 ETc followed by 0.8 ETc.
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