小麦播种不适时,过早过迟都会减产。从安泽县1984—1985年度试验来看,迟播小麦减产是惊人的。我是9月4日播种第一期,以后每隔5天种一期,到10月14日共种九个播期。结果是9月19日播种的产量最高,折合亩产345.5公斤,10月14日播种的折合亩产仅126.5公斤,减产63.8％。在9月19日到10月14日之间,每迟种一天,平均减产8.8公斤,减产率为2.5％。试验中还看出偏迟播种比偏早播种减产更重。如自9月19日往前提三个播期是9月4日,该播期折合亩产256公斤,减产25.9％;往后推三个播期是10 When sowing wheat, it will be cut too soon too late. From Anze County 1984 - 1985 annual test point of view, delayed sowing wheat yield is staggering. I planted the first period on September 4, I planted it once every 5 days and shared 9 sowing dates on October 14. As a result, the highest yield was sown on September 19, equivalent to 345.5 kg per mu. On October 14, the yield per mu was 126.5 kg, down 63.8%. Between September 19 and October 14, on an average of 8.8 kilograms per day, the yield reduction rate was 2.5%. In the experiment, it was also found that the delayed sowing was more serious than the premature sowing and sowing. As from September 19 to mention three sowing date is September 4, the sowing date yield 256 kg per mu, cut 25.9%; push three sowing time is 10