YIELD TARGETING AND INTEGRATED PLANT NUTRITION SYSTEM TO FIX CRITICAL LEVELS OF SOIL AVAILABLE N, P AND K FOR CABBAGE IN INCEPTISOLS

摘要

Fertilizer prescriptions are being developed by employing various mathematical models. Targeted yield model is the one, which is unique in the sense that it provides means for soil test based fertilizer doses and also for the computation of critical soil test values. These values are the soil test levels above which there would be no requirement of fertilizer application for indicated levels of crop yield. This would help in prescribing rationalized fertilizer doses and avoiding over or under usage of fertilizer inputs. Hence the present study was conducted during 2003-2004 in Inceptisols to fix the critical soil test values for KMnO_4-N, Olsen-P and NH_4OAc-K as influenced by yield targeting and Integrated Plant Nutrition System (IPNS) for cabbageusing targeted yield model.