Abstract:

This article uses the world food and agriculture organize (FAO) announcement the pattern, has calculated Gansu east plateau area winter wheat different growth stage water demand, and analyzed this region winter wheat different growth stage water resources abundant and famine, has been possible to grow the season water resources constitution and the agricultural production countermeasure. The analysis demonstrated that east Gansu before the plateau area winter wheat winter the vegetal period water resources are surplus, after turn green the vegetal period water resources to be short, the short most serious time interval is Cheng Suiqi, namely mid-April to mid-May, the water resources total quantity accounts for the water demand 67%, 80% guarantee rate is only 31%, is affects the winter wheat output the crucial phase. Spring, the summer, fall three may grow in the season, spring the wheat field water resources by the early spring soil water storage primarily, summer by the natural precipitation primarily, the autumn early fall soil water storage and the natural precipitation account for the water resources total quantity the proportion to be close. The adult plant vegetal period water resources, Cheng Suiqi the water resources and the entire period of duration water consumption and the winter wheat output relativity are high, seedling time and grain formative year water resources to output influence relative small. The agricultural production needs to act according to the different time water resources constitution characteristic macro-scientific policy-making planter pattern, and takes the project measure or the production measure reduces effectively survives the winter the time soil moisture to lose, before the wheat field winter the prosperous long sludge fertilizer loses, the late autumn and early the Spring and Autumn Period white moisture content invalid loss, raises the moisture content use factor.