The Soil Moisture Forecast and Irrigation Calculation in the period from wheat seedling to booting
The observation data of 850 Farms in Heilongjiang province were analysed. There is drought in May and June,the period is a crucial stage of wheat needing water,corresponding wheat seedling to booting stage. The experiential formula was suggested to forecast soil moisture with the application wheat field measurement. The optimum irrigating time and amount were determined.