|
|
|
Interpretive Summaries:
2012 - Site-Specific Nutrient Management for Rice-Wheat in Punjab
2011 - Site-Specific Nutrient Management for Rice-Wheat in Punjab
2010 - Site-Specific Nutrient Management for Rice-Wheat in Punjab
2009 - Site-Specific Nutrient Management for Rice-Wheat in Punjab
Site-Specific Nutrient Management for Rice-Wheat in the Punjab, 2011
This study was initiated to develop and implement a site-specific nutrient management (SSNM) strategy for the rice-wheat system under conventional and no-till cultivation. Three types of trials were conducted 1) omission plot trials with four treatments (-N, -P, -K, and NPK); 2) omission plot trials in direct seeded rice (DSR) and puddled transplanted rice (PTR) with nine treatments (-N, -P, -K, NPK, Full NP reduced K, Full NK reduced P, Full N reduced PK, Reduced N full PK and -Zn); and 3) Nutrient Expert (NE), a field-specific nutrient recommendation tool for wheat, evaluation trials with three treatments (farmer fertilizer practice, state recommended fertilization, and NE-based fertilizer recommendation).
DSR yielded higher than PTR in the ample NPK plot. However, yield loss in N, P and K omission plots in DSR (2,278, 1,481 and 1,164 kg/ha, respectively) was greater in DSR than in PTR (1,749, 918 and 696 kg/ha, respectively). This might be due to higher availability of soil nutrients under puddled conditions. Reduction of N, P and K rates by 20, 25, and 50% respectively led to average yield decline of more than 1 t/ha in DSR and about 0.7 t/ha in PTR for each nutrient. This indicated that reduction in nutrient rates, even for P and K, could cause significant economic loss. Interestingly, omission of Zn caused an average yield decline of 833 kg/ha in DSR and 522 kg/ha in PTR, thus, highlighting the issue of extensive Zn deficiency in Punjab soils.
Average wheat yields under zero and conventional tillage methods were 4,965 and 4,770 kg/ha, respectively, in ample NPK treatment plots. Nitrogen was the most limiting nutrient across sites, followed by P and K. Yield decline due to nutrient omission was higher in zero till than in conventional tilled wheat. Across all sites, the NE-based fertilizer recommendation recorded the highest yield of 6,200 kg/ha in zero till wheat and 5,633 kg/ha in conventionally tilled wheat. Average yield increase through NE recommendation in wheat grown after rice was 700 kg/ha over State recommendation and 900 kg/ha over farmers’ practice. Similar yield increases (450 and 1,013 kg/ha over state recommendation and farmers’ practice, respectively) were also noticed in cotton-wheat system. Application of N in equal splits as basal and at crown root initiation stage with wheat performed best in Punjab. India-007
|
|
