Effect of integrated nutrient management on growth and yield of rainfed maize in alfisols.

摘要

A field study was conducted at Dry Land Agriculture Project, University of Agricultural Sciences, Bangalore, Karnataka to study the crop growth and yield of maize in response to recommended fertilizers as well as integration of different organics nutrient sources. Treatments were: 100% NPK through fertilizers (T1), 50% N through fertilizer + 50% N through FYM + balance P and K as fertilizers (T2), 50% N through fertilizer + 50% through city compost + balance P and K as fertilizers (T3), 50% N through fertilizer + 50% N through sewage sludge + balance P and K as fertilizers (T4), 50% N through fertilizer + 50% N through poultry manure + balance P and K as fertilizers (T5), 50% N through fertilizer + 50% N through gliricidia green manure + balance P and K as fertilizers (T6) and 50% N through fertilizer + 50% N through composted parthenium + balance P and K as fertilizers (T7). Application of recommended NPK through fertilizers resulted significantly in higher leaf area index and leaf area duration at 60 DAS (3.92/plant and 109.3 days) followed by 50% N through fertilizer + 50% N through poultry manure + balance P and K as fertilizers (3.72/plant and 102.7 days), respectively. Application of recommended NPK through fertilizers produced higher grain and stover yield (4374 kg and 6.68 t/ha, respectively) with a harvest index of 0.40, followed by 50% N through fertilizer + 50% N through poultry manure + balance P and K as fertilizers (3996 kg/ha grain and 6.46 t/ha stover) with a harvest index of 0.38 over rest of the treatments. The results of the study clearly indicates that the application of recommended NPK through fertilizers (100: 50: 25 kg/ha N, P2O5 and K2O) recorded significantly higher grain yield (4374 kg/ha) and stover yield (6.68 t/ha) with a harvest index of 0.4, followed by the application of 50% N through fertilizer + 50% N through poultry manure + balance P and K as fertilizers (3996 kg/ha grain and 6.0 t/ha stover yields).