摘要 : A field experiment was conducted to evaluate the integrated use of organic and inorganic N sources on soil fertility in maize during rabi 2004-05 at dry land farm, S. V. Agricultural College, Tirupati, Andhra Pradesh. The experime... 展开 A field experiment was conducted to evaluate the integrated use of organic and inorganic N sources on soil fertility in maize during rabi 2004-05 at dry land farm, S. V. Agricultural College, Tirupati, Andhra Pradesh. The experiment was laid out in a randomized block design with factorial concept consisting of combinations of four levels (100, 75, 50 and 25% organic N) each of vermicompost (VC), poultry manure (PM), farm yard manure (FYM) and sulfitation pressmud (SPM). Conjunctive use of organic manures and inorganic fertilizers significantly influenced the nutrient status of soil. The available soil nutrients viz., N, P, K and S were significantly influenced by different sources, levels and their interactions. The highest N, P, K and S in soil was recorded with PM when compared to other treatments tried in this study. Application of N through 50% organic source recorded highest N, P, K and S content in soil Regarding the interaction, the highest N, P, K and S in soils was recorded in PM with 50% organic N treated plots. 收起