Field experiments were conducted during Samba season during 2007-2009 at Anbil Dharmalingam Agricultural College and Research Institute, Trichy Farm to study the effect of organic manures, biofertilizers, panchakavya and neem products on rice yield in sodic soil. The experiment was laid out in split plot design. The main plot treatments consisted of different combinations of green manures, vermicompost, farm yard manure and biofertilizers. The sub-plot treatments consisted of need based NSKE 5% spray + pseudomonas 2.5 kg ha-1 for soil application (S1), panchakavya 3% seed treatment + panchakavya 3% foliar spray at flowering, grain filling and grain maturity (S2), Azospirillum root dipping (1kg ha-1) (S3) and need based spray of Azadiractin 1% formulation (S4).
The two year study revealed that application of recommended dose of fertilizers @ 187-50-50 kg NPK ha-1 and application of green manures 8.3t ha-1 + vermicompost 2.1 t ha-1 + biofertilizers recorded significantly the highest grain yield and were on par. With regard to the sub plot treatments, Azospirillum root dipping @ 1 kg ha-1 recorded significantly the highest grain yield followed by S2 and S4.