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To find out the effect of low grade Udaipur rock phosphate (URP), single super phosphate and their mixtures on exchangeable soil calcium at different growth stages of a groundnut- maize cropping system, a field experiment was conducted in a randomized block design with three replications and eight treatments from 2013-14 to 2015. The soil has a loam texture, a pH of 5.18, low available nitrogen and medium phosphorus and potassium. In control, exchangeable calcium decreased gradually from the initial value of 1.31 c mol (p+) kg-1 to 0.74 c mol (p+) kg-1 after four seasons. In sole URP treatments (T2 and T7) the exchangeable calcium in T2 and T7 after four seasons were 1.07 and 1.01 c mol (p+) kg-1 respectively. The highest value of exchangeable calcium 1.18 c mol (p+) kg-1 was recorded in SSP+ lime treatment (T8) followed by 1.16 in SSP (T3) and 1.15 c mol (p+) kg-1 in URP+SSP 1:1 (T5) treatments respectively. Maximum dissolution of URP in the root zone of maize-groundnut cropping system occurred during 30-60 DAS after sowing whereas higher dissolution of URP occurred within 30 DAS in URP+SSP (1:1) treatment.

international journal of chemical studies

Effect of low grade rock phosphate, single super phosphate and their mixtures on soil exchangeable calcium, Δ Ca in a groundnut-maize cropping system on the acid Alfisols of Odisha state, India over two years