INFLUENCE OF DIFFERENT INORGANIC PHOSPHATIC SOURCES AND ORGANIC MANURES ON FRACTIONS OF PHOSPHORUS IN SODIC SOIL
Abstract
Author(s): M. Manimaran
A field experiment was conducted in sodic soil to assess the effect of different sources of phosphorus and organics on fractions of phosphorus under maize. The treatments included here were Control ( T1), SSP alone (T2), SSP + GM @ 10 t ha-1 (T3), SSP + FYM @ 12.5 t ha- 1(T4), SSP + VC @ 0.5 t ha-1(T5), DAP alone (T6), DAP + GM @ 10 t ha-1 (T7), DAP + FYM @ 12.5 t ha-1 (T8) and DAP + VC @ 0.5 t ha-1 (T9).The results of the experiment revealed that the application of SSP + FYM @ 12.5 t ha-1 (T4) recorded higher release of P from its fractions such as Ca-P, Fe-P, Al-P, saloid bound P, reductant soluble P, Olsen’s P. The mean values ranged from 664.86 to 643.21 kg ha-1 in Ca-P, 162.51 to 158.86 kg ha-1 in Fe-P, 200.34 to 181.39 kg ha-1 in Al-P, 250.96 to 246.89 kg ha-1 in saloid bound P, 179.00 to 176.21 kg ha-1 in reductant soluble P, and 23.15 to 9.93 kg ha-1 in Olsen’s P over a period of time. The concentration of organic P was getting raised in all the treatments. The treatment with the application of SSP along with FYM (T4) recorded a higher organic P concentration at all stages of crop growth with the mean values ranged from 465.08 to 468.25 kg ha-1. Key words: Olsen’s P, Organic P, Reductant soluble P, FYM
