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1. The effect of FYM application was found to be comparable or even superior to lime amendment on the acidic soils which seemed mainly due to the formation of A1-organo-chellates, resulting in the reduction of A1 concentration in soil solution to levels beneficial to plant growth.
2. Similarly, in the red soils of Hyderabad, the average increase in rice yield due to NPK+FYM was 17-21 percent in both Kharif and Rabi seasons.
3. These and other results suggest that substitution of 25-50 percent of the N through FYM in Kharif and application of 75-100 percent optimum level of NPK in the Rabi produced the highest yields of rice.
4. The beneficial effect of organic manures in increasing nitrogenuse- efficiency was also evident, particularly in the Rabi season. Further application of NPK fertilizers alone did not influence the yield of succeeding rice crop but the residual effect was observed with the incorporation of organic manure.
5. The grain yield of Kharif rice was increased by 21-22 percent and 10-13 percent with the application of Azolla or wheat straw and FYM or water hyacinth compost, respectively.
6. The residual effect of these sources on the succeeding Rabi rice showed a yield increase of 14-18 percent and 8-10 percent compared with the control.
7. The residual effect was more pronounced with integrated used of NPK fertilisers and organic manures. Therefore, integrated nutrient supply is important as a soil ameliorant in alleviating the adverse soil ecological conditions as in the case of acid lateritic soils and in improving soil fertility and productivity.