Effect of Bioslurry on the Yield of Wheat and Rice in the Wheat–Rice Cropping System

Abstract

The study was conducted to assess the integrated use of chemical fertilizers with organic manure in the wheat–rice cropping systems in Bangladesh. The experiment involved a sole chemical fertilizer treatment, four treatments based on the integrated plant nutrition system (IPNS) with 5 t ha−1 cowdung (CD) and cowdung bioslurry, 3 t ha−1 poultry manure (PM) and poultry manure bioslurry and a control. The wheat crop received manures and/or bioslurries, and its residual effect was evaluated for succeeding T. Aman crop. Poultry manure bioslurry, poultry manure, cowdung bioslurry, and cowdung gave 11.7, 8.9, 5.4, and 3.1% respective increase in total system productivity over sole chemical fertilizer (46% N, as urea, 20% P as triple superphosphate, 50% K as muriate of potash and 18% S as gypsum). Bioslurries supplied greater amount of nutrients compared to their respective original state of soil which influenced nutrient uptake of the test crop. Cowdung bioslurry is recommended as a substitute of 24–32% N, 52–91% P, 18–24% K and 50–73% S and that for poultry manure bioslurry of 19–21% N, 87–94% P, 12–14% K and 49–61% S of the recommended nutrient rate. The plant analysis showed that total N, P, K, and S contents improved significantly by integrated use of CD and PM bioslurry with IPNS based chemical fertilizers. Total system productivity (TSP) was significantly influenced by different treatments which ranged from 3.43 to 7.88 t ha−1 in 2011 and 3.66 to 7.82 t ha−1 in 2012.