The Analysis of the Relation Between Maize Yield and Climatic Factors in Main Planting Regions of Liaoning Province

Based on Shenyang,Tieling and Anshan agricultural climate information and maize production from 1980 to 2004,the straight line sliding in average model was used to separate the climatic yield,and the relation between the climate factors(temperature and the rainfall) and meteorological yield was analysed preliminarily.The result showed that the main factor of maize climatic yield was rainfall during the whole maize planting phase in Liaoning Province,the second factor was the accumulated temperature and the extreme temperature.The rainfall crucial phase was from July to August and from April to May.The accumulated temperature crucial phase was from July to August.The much or less rainfall and the much or less accumulated temperature were bad for maize meteorological yield.The effect of the extreme maximum temperature was greater,the effect of the extreme minimum temperature was smaller,the possibility of the extreme maximum temperature gradually rise,the possibility of extreme minimum temperature gradually reduced in Liaoning.