Abstract: Based on the measured data in field and comprehensive consideration over the meteorological condition, crop and soil state, the calculation model of field evapotranspiration, with Penman's field evaporative power, biological function and field soil water availability function. for different crops (cotton, maize and winter wheat) was established. Using routine meteorological and agrometeorological data,the model has good precision and is of value in utilization.

Key words: tea seed meal, EDTA, sugarcane, Ni, Zn, accumulation.