Yield responses of sorghum-rice rotation to phosphorus and available soil moisture in an Alfisol
1993
Dongale, J.H. | Kadrekar, S.B. (Konkan Agricultural Univ., Maharashtra (India). Dept. of Agricultural Chemistry and Soil Science)
Field experiments with sorghum-rice rotation were conducted during 1985-1986 and 1986-1987 in a P-deficient Alfisol. The dry weight of leaves/plant; 1000-grain weight; grain yield/ha; N, P, and K uptake; and apparent recovery of P (ARP) of sorghum were appreciably higher when the irrigations were scheduled at 60 % available soil moisture (ASM) compared to 20 % ASM. Plant height, vegetative yield components, grain yield, and NPK uptake by sorghum showed significant increases with P application ranging from 17.5 to 35.0 kg P/ha. The grain yield of the succeeding rice crop also showed significant increase due to the residual P applied to sorghum in 1986 at 35 and 52.5 kg P/ha. Irrespective of residual P levels, application of 10.87 and 21.74 kg P /ha to rice appeared essential and thus both crops in rotation need P fertilization in Alfisols for higher productivity. With an application of 35 kg P/ha to sorghum, the mean total ARP in the crop rotation was 17.44 % in which sorghum and rice accounted for 14.09 and 3.35 % respectively
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