Regional Agricultural Research Station, Jagtial - 505 327, A.P.
1Part of Ph.D thesis submitted by the first author to Acharya N.G. Ranga Agricultural University, Rajendranagar, Hyderabad.
Integrated use of organic manures and inorganic fertilizers were evaluated for soil health, crop response and economic feasibility of their use in tomato-onion cropping system. Application of organic manures in conjunction with inorganic fertilizers significantly improved Phosphatase activity of soil. Significant and positive correlations existed between organic carbon and Phosphatase activity of the soil. Based on the results of this study it could be concluded that the combined use of organic manures at 50 or 75 or 100 per cent level of N with 50 or 75 or 100 per cent N through inorganic fertilizers respectively increases the phospatase activity in the soil. The mean values of phospatase activity ranged from 20.11 to 25.01 with FarmYard Manure, 20.69 to 25.85 with vermi compost, 20.22 to 25.27 with poultry manure, 20.16 to 25.05 with neam cake treated plots againest control (18.23–19.56) and recommended dose of nitrogen (19.27 to 21.54 μg p nitrophenol g−1 soil h−1).
