Effect of soil and foliar applied potassium fertilizers on yield, quality and economics of Bt cotton (Gossypium hirsutum) in Vertisol
2018
Jyothi, T.V. | Hebsur, N.S.
A cotton (Gossypium hiresutum L.) hybrid ‘MRC 7351’ was grown during 2012–13 and 2013–14 at main Agricultural Research Station, University of Agricultural Sciences, Dharwad in Vertisols under rainfed condition with protective irrigation to check the effect of potassium on growth, yield and fibre quality of Bt cotton. The crop was sown in a randomized complete-block design and was replicated thrice. Pooled data of 2 years indicated that number of sympodial branches (24.7), number of total bolls/plant (46.9), mean boll weight (7.0 g) and seed-cotton yield/plant (150.4 g) in treatment receiving 100: 50: 75 [reccommended dose of nitrogen and phosphorus (RDNP) + 150% recommended dose of potassium (RDK)] + 2% KNO₃ foliar spray at 70, 90 and 110 days after sowing (DAS) resulted in significantly higher seed-cotton yield (2, 689 kg/ha) over other treatments. Significantly higher fibre length (33.5 mm), uniformity ratio (48.8%), ginning outturn (38.5%), seed oil content (16%) and lowest micronaire value [4.4 μg/inch (2.54 cm)] were also recorded in the same treatment.
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