Research on influence factors and prediction model of transpiration intensity of semilate rice at none-water layer of paddy

A field experiment was conducted to study prediction models of rice transpiration intensity at three different growth stages (including jointing booting, heading to flowering and milk stage) at none-water layer. Correlation analysis and stepping multi-regression analysis suggested that soil moisture content of root zone, temperature in the field, relative humidity and wind speed were the four main factors affecting the transpiration intensity of semilate rice. Error analysis also showed that the multi-linear regression models of transpiration established based on soil moisture content and major meteorological factors at three different growth stages were satisfying, and the maximum relative errors are 4.39%, 1.71% and 2.81% respectively. Research results establish a basis for the calculation of semilate rice water requirement at none-water layer of paddy.