By analyzing the relation between wheat yield and precipitation(from July of the past year to May of this year)from 1952 to 2008 in Linfen.Results shows that the yield of wheat per unit basically increased with the raise of precipitation,the wheat yield per millimeter of precipitation fundamentally decreased with the raise of precipitation.Dividend by the year of 1981,the yield of wheat per unit during 1982—2008 significantly increased due to the progress in production technology and the support of policy.C...
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