Research And Application Based On Climatic Suitability Of Winter Wheat

Using the data of daily highest temperature, the lowest temperature, precipitation, sunshine time, soil moisture and winter wheat development period, agricultural meteorology indexes, and considering the different effects of soil moisture and precipitation on winter wheat different growth stage, the calculation method for winter wheat moisture suitability is established. And the paper further construct a climate suitability model of winter wheat combined by the calculation method of winter wheat moisture suitability, temperature suitability and sunshine suitability. Using correlations between climatic suitability under different periods and meteorological yield of winter wheat, the calculation method for climate suitable index of winter wheat sowing to a time is established on the methodology of weighted average.(1) Based on the forecasting factor of winter wheat climate suitability, the winter wheat development period forecast model is established. The simulation results indicate that the average errors between the simulation days from models of different districts and actual days are1-2days, the average errors between simulation days from models of different development period and actual days are within4days. The forecast and test shows that average errors between simulation days from models of different districts, development period and actual days are within three days.(2) Making use of historical maximum, minimum and average climate suitable index and the observed test data of winter wheat, the diagnostic threshold of climate suitable grade from winter wheat sowing to a growth stage is set up. Based on the diagnostic threshold of winter wheat climate suitable grade,3diagnostic indicators of climate suitable grade from winter wheat sowing to a growth stage in these3province are built.