Simulation of Nitrogen Uptake, Nitrogen Utilization Efficiency and Yield of Wheat under Tillage, Residue and Nitrogen Management using DSSAT-CERES-Wheat Model

摘要

Crop Simulation Models (CSMs) serve as effective tools for taking decisions about optimization of resource use provided they are calibrated and validated in a particular agro-climatic region. Therefore, the experiment was conducted to simulate the influence of tillage, residue and nitrogen interaction on grain and biomass yield, nitrogen uptake and nitrogen utilization efficiency of HD-2967 cultivar of wheat in a sandy-loam soil of Indo-gangetic plains using CERES - Wheat model of DSSAT. The model was calibrated and validated with the field experiment data of the years 2014-15 and 2015-16, respectively. The results showed that the N uptake increased but N utilization Efficiency decreased with increase in N levels. The effect of tillage and crop residue mulch on grain and biomass yield of wheat was not significant but it increased with increase in the N levels. During stress free season (2014-15), irrigated wheat crop responded upto 120 kg N/ha while under temperature and water stress (2015-16), thecrop responded upto 180 kg N/ha. Crop simulation model DSSAT could satisfactorily simulate grain yield (R2 = 0.759), biomass yield (R2 = 0.728) and N uptake(R2 = 0.883) in wheat.