小麦是金华市春粮生产中的主要作物,历年种植面积约占春粮总面积60～85％。但它的产量(系全市平均亩产,下同)年际波动较大,如1963～1982年产量的变异系数达28％。分析其原因,主要与当地小麦生长期间降水量的年际波动有关,据金华上述年代统计:从小麦出苗分蘖期(11月下旬)至成熟期(5月中旬)平均总雨量为668毫米,变异系数24％,1973 Wheat is the main crop in spring grain production in Jinhua City. The annual acreage accounts for 60-85% of the total area of ​​spring grain. However, its output (the city’s average yield per mu, the same below) fluctuates significantly from year to year, with a coefficient of variation of 28% for the period 1963-1982. The reason is mainly related to the interannual fluctuation of precipitation during the growing season of wheat. According to the above statistics of Jinhua, the average total rainfall from the tillering stage of wheat (late November) to the mature stage (mid-May) is 668 mm, the variation Factor of 24%, 1973