Author(s):

Komal A Gade, DV Mali, NR Dange, PR Kadu, GS Laharia, PW Deshmukh, AB Aage, Nilam Kanase and DS Kankal

Abstract: The present investigation was conducted during 2018-19 with a view to study the effect of precise application of nutrients on yield and nutrient uptake of Bt cotton in Vertisols at Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. The experiment comprised of eight different treatments and their combination with foliar spray of 1 per cent MgSO₄ at two different growth stages viz. flowering and boll development in randomized block design with three replications. The results indicated that the treatment receiving N at basal, 30 DAS, 60 DAS and 90 DAS, P at basal, K at basal + 60 DAS + foliar spray of 1% MgSO₄ at 60 and 90 DAS recorded significantly higher seed cotton yield and stalk yield of Bt cotton which was found at par with N applied at basal, 30 DAS, 60 DAS and 90 DAS, P and K at basal. The concentration and uptake of N, P, K, S, Ca++ and Mg++ in cotton seed and cotton stalk was increased with increasing splits of N and K fertilizer which was slightly increased with application of magnesium. The concentration of N, P, K, S, Ca and Mg in cotton plant was initially higher at boll development stage which was decreased later at harvest. Foliar application of Magnesium Sulphate @ 1 per cent at two growth stages viz. flowering and boll development was also found useful for reducing reddening of leaf in Bt cotton. The optimum dose of NPK with appropriate split application of N and K with magnesium supply at proper growth stage appears to be useful for increasing yield and nutrient uptake by Bt cotton in Vertisols. The correlation among dry matter accumulation at boll development stage and seed cotton and stalk yield was found significant.

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