Effect of moisture regimes, FYM and levels of P carriers on available P status of loamy sand in laboratory condition

Abstract

Incubation study was carried out during 2017, in the Laboratory of Department of Agricultural Chemistry and Soil Science, C. P. College of Agriculture, S. D. Agricultural University, Sardarkrushinagar. 180 treatments comprising of three levels of moisture regimes (W1 = 100 %, W2 = 50 % and W3 = 25 % available water capacity), three levels P (P0 = 0.0, P1 = 1.34 and P2 = 2.68 mg P/100 g soil) of two P carriers (S1 = MAP and S2 = DAP), two levels of FYM (M0 = 0 and M1 = 10 t/ha) and five incubation intervals (I0 = 01, I1 = 03, I3 = 05, I4 = 07 and I5 = 14 days) were evaluated under completely randomized design (with factorial concept) with three replications. The results revealed that available P2O5 content in soil was significantly increased with maintaining moisture up to 25 per cent available water capacity. Application of FYM @ 10 t/ha significantly increased the available P2O5 content in soil. The phosphorus availability in soil was significantly increased with increasing the rate of P application. DAP was found superior over MAP with respect to phosphorus availability in soil. Phosphorus availability in soil was increased with increasing the incubation intervals from 01 to 14 days, but it was found highest after three days interval. It is concluded that, available phosphorus content in soil was increased significantly with maintaining available water capacity up to 25 per cent of field capacity, levels of FYM and P carriers with increase in the incubation time up to 14 days. Among the P carriers tried, DAP was found superior to MAP with respect to phosphorus availability in loamy sand.