Field experiments were conducted on dryland soils of AICRPDLA, Solapur for three years (2015-2016 to 2017-18) to evaluate the influence of different levels of potassium on kharif black gram-rabi sorghum cropping sequence in the randomized block design (RBD) for kharif black gram and split plot design for rabi sorghum. Grown in a sequence, kharif black gram and rabi sorghum responded significantly to the application of 20 and 50 kg K2O ha-1, respectively. Potassium application to both the crops sustained optimum levels of water soluble, exchangeable and non-exchangeable K in the soil which enhanced the K uptake and improved the moisture use efficiency over the farmers’ practice which exclude the application of K. Inclusion of K in fertilization schedule gave 38 and 9.5% higher yield in kharif black gram and rabi sorghum crops, respectively. Higher monitory returns and B:C ratio over the farmers’ practice were associated with application of potassic fertilizers.
Keywords: Potassium, fertilization, black gram – sorghum sequence, potassium fractions.
This research was funded by the International Potash Institute (IPI).
Vijay Amrutsagar, Nilkanth More, Archana Pawar, Surinder Kumar Bansal and Patricia Imas
Indian Journal of Fertilisers 15(7):758-764 (July 2019)
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