Improving effectiveness of rock Phosphate through mixing with Farmyard manure, Humic acid and Effective microbes to enhance yield and Phosphorus uptake by wheat

The cheaper rock phosphate (RP) could replace the commercial phosphatic fertilizer with pronounced advantages provided if the solubility and release of P form RP is enhanced through addition of some organic amendments. Thus the present field study was conducted to investigate the effect of RP treated with farmyard manure (FYM), humic acid (HA) and effective microbes (EM) on the yield and uptake of P by wheat in marginal P calcareous alkaline soil during rabi 2011-2012. The results showed that the application of RP alone significantly increased the grain yield from 3.74 in control to 4.42 t ha^sup -1^. This effect of RP was further enhanced when combined with FYM, HA, or EM and produced 4.98, 4.6 and 4.8 t grain yield ha^sup -1^, respectively suggesting improvement in P solubility. When RP was applied with FYM+HA+EM the grain yield jumped to the maximum (5.2 t ha^sup -1^) which was statistically similar to SSP.