Yield Gap Analysis Using Oryza 2000 Model in Two Rice Growing Districts of Andhra Pradesh

The study describes the modeling approach in order to estimate the yield gap in Guntur and Nalgonda districts of Andhra Pradesh. ORYZA 2000 model was validated for both districts. Three years of (2007-08 to 2009-10) Guntur and Nalgonda district yields were collected from Directorate of Economics and Statistics andhra Pradesh. Weather information is collected from the meteorological departments of the respective regional research stations was used as input parameters of the model ORYZA 2000 to determine potential yield. The yield gap was estimated as the difference between potential and actual yield. The highest yield gap was recorded in two districts and is related to the management factors and soil related problems. The delay in transplanting (or sowing) of rice is due to delay in rainfall and late release of canal water. The model estimated yield gap of 3410 and 4012 kg ha in Guntur and Nalgonda districts, respectively. 1