徐州地区1200万亩耕地,常年种植冬小麦600万亩左右,小麦产量约占全年粮食总产的三分之一。不仅小麦的丰歉与粮食产量关系极大,而且成熟期的早晚也直接影响全年的生产。近年来我区小麦成熟期明显偏迟,与六十年代比较,麦收时间一般推迟了5—10天。这给生产带来许多问题。例如,这样就使麦季农活过份集中,劳力紧张,往往顾此失彼,耽误春作物的田间管理,影响夏作物的适时播种,以致后期受秋季低温危害。同时,也会使小麦迟熟,灌浆后期往往出现高温逼熟或遇干旱风危害,粒重下降,影响产量。而且由于雨季迫近,也容易发生“烂麦场”。1979、1980年雨季开始时间虽与常年接近。但由于迟熟,普遍发生 Xuzhou area 1200 mus of arable land, perennial planting of about 6000000 acres of winter wheat, wheat output accounts for about one-third of the total grain output. Not only does wheat apology and food production have a great relationship, but sooner or later the maturity period also directly affects the annual production. In recent years, wheat maturity in our region was significantly delayed, compared with the sixties, wheat received generally delayed 5-10 days. This brings many problems to production. For example, this would lead to over-concentration of McKinsey’s workforce and strain of labor, which often resulted in the loss of farm management of spring crops and the timely sowing of summer crops, resulting in the latter being endangered by the cold temperatures in autumn. At the same time, wheat will also be late-maturing. In the late filling stage, high-temperature ripening or drought-induced wind damage may occur, and the grain weight will drop, affecting the yield. And because the approaching rainy season, but also prone to “rotten wheat field.” Although the beginning of the rainy season in 1979 and 1980 are close to normal years. However, due to late maturity, widespread