Estimation of Effective Rainfall in Wet Season Paddy

MIZUTANI Masakazu, Rath Bisweswar, Mohanty Binayak Prasad, Prasanta Kumar Kalita

doi:10.11408/jierp1982.1991.21_15

The water balance model has been modified and used in this study for the estimation of effective rainfall for lowland paddy. The component of interception was included in the water balance model. The relationship of interception to rainfall at three growth stages was established with the help of field experiments and utilized in the simulation. Eight rainfall stations in Thailand, whose rainfall records for the past 30 years are available, were selected for analysis. Simulation was run with computed crop water requirement and various values of percolation rate, ponding depth and irrigation interval to study their effects on effective rainfall, irrigation requirements and types of irrigation practiced. It was found that 150mm ponding depth and 5/6 days irrigation interval is most suitable and economical for lowland rice from the effective rainfall and efficient irrigation point of view. An attempt has also been made to reflect the effects of major variables on certain farming conditions. The two programs developed for simulation and rainfall analysis were in FORTRAN 77 and were run in IBM 3083 at the Regional Computer Center, Asian Institute of Technology, Bangkok.

Estimation of Effective Rainfall in Wet Season Paddy

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