PREDICTING THE POTENTIAL PRODUCTION OF VARIOUS RICE GENOTYPES USING DSSAT CERES-RICE MODEL AND ESTIMATING THE YIELD GAP UNDER VARIOUS AGRO-ECOLOGICAL REGIONS OF TAMIL NADU

摘要

The potential yield of various rice genotypes (i.e) IR 64, White Ponni, ADT38, ADT 39, CO 47 , ADT 45 and Basmati 370 under different agro-ecological regions of Tamil Nadu was predicted using CERES- Rice model. The historical weather data of ten locations covering various agro ecological regions of Tamil Nadu were collected and the monthly average were calculated using the weatherman module of DSSAT (v 3.5). Based on the monthly average values, the weather data for all the locations were simulated. The potential production of the genotypes as influenced by weather parameters was predicted by setting the model inputs to unlimited water and N supply and the date of planting as per the crop production guide. The predicted potential yield was compared with actual yields obtained n the respective regions. The simulated results showed that among the cultivars, IR 64 recorded the maximum phonological growth and yield components like number of grains; grain weight; panicle number and grain yield irrespective of the locations. The predicted potential production of all the cultivars showed that there exists a huge gap between the actual yield and predicted yield. This confirms that there exists further scope for increasing the productivity.