Abstract

A field experiment was conducted in the lateritic soil of Instructional Farm, Vellanik- care to study and estimate the grain and loss of water in the soil such as rainfall, run- aff, evapotranspiration, effective rainfall and deep percolation on rainfed cassava under various cultivation techniques which are common in the State. Profile moisture storage upto 150 cm depth of the soil was determined with neutron scattering method. It is nferred that the maximum water storage capacity of the soil under actual field condi- lons cannot be taken as its field capasity measured at 0.3 bar pressure. Evaporation rom bare land surfaces were much lower than the ET estimated under cultivated plots. in equation was suggested for finding out crop ET based on measurement of surface oil moisture content and potential avapotranspiration.

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