Potential yield and yield gap analysis of rice (Oryza Saliva L) in eastern and north eastern regions of India using CERES-rice model

摘要

Crop simulation models have been used to determine potential yield in a given environment. The twenty one years (1990-10) weather data and reported rice yield of Bhagalpur, Ranchi, Kalyani and Jorhat districts of eastern and north eastern region of India were used to simulate the yield under the various management conditions and compared with the reported yield of the districts. The management option included dates of sowing, irrigations and fertilizers application. The potential yield, attainable yield, yield gap etc were computed over the period. The results revealed that the rice yield of Kalyani and Ranchi districts showed increasing trend (30 to 65 kg ha(-1)yr(-1)) while decreasing trend was observed in Bhagalpur and Jorhat districts (6 to 9 kg ha(-1)yr(-1)). The potential yield simulated by model in different districts varied between 2864 to 4742 kg ha(-1), while reported yield varied between 1159 to 2224 kg ha(-1). The delay in sowing by 15 days caused reduction in rice yield by 31 to 74 kg ha(-1)day(-1) at different locations. The management yield gap was between 1495 to 3216 kg ha(-1) while sowing yield gap was between 467.4 to 1114.0 kg ha(-1) in different districts under study.