Evapotranspiration and growth under field conditions during the grain filling stage of KMDL 105 rice(Thai)

Abstract

Experiments were conducted to measure the evapotranspiration rate of paddy using Bowen Ratio Energy Balance and growth of rice during the grain filling stage. The measured data was used to validate the estimates of evapotranspirational rate by the FAO Penman-Monteith and Priestley and Taylor equations, and the estimates of rice growth using the Radiation Use Efficiency approach. The results showed good agreement between measured and estimated evapotranspirational rates obtained from both FAO Penman-Monteith and Priestley-Taylor equations. Although growth of rice was slightly underestimated, the approach was sufficiently sensitive and capable of revealing the recovery of rice from water stress.