山区晚播麦田,由于小麦生育期间积温不足,达不到早发、壮苗的要求,造成穗数,粒数减少,千粒重降低,成为山区小麦全面增产的“拉腿地”。为了提高山区晚播麦田产量,1983—1984年便开展了晚播麦田覆盖地膜试验。试验是在我所试验地(海拔175米)进行的。共设置11月14日、24日、12月5日、及1月11日四个播种期、盖膜处理。以不同播期的露地(不覆盖地膜)为对照。小区面积0.02亩、三次重复、随机区组排列。小麦品种为郑早。每亩播种量20斤。播种前每亩施底肥尿素40斤、过磷酸钙50斤。播种后立即覆盖地膜。地膜规格为一般透明地膜。试验结果如下: 一、增产效果显著从表一可见,不同播期的覆盖地都比对照增产,而且其增产幅度随着播期的推迟而增大。这充分说明晚播麦田覆盖地膜是山区小麦全面增产的有效措施之一。二、各产量因子得到了加强覆盖地膜的晚播麦田,由于地膜透光能力强,膜内昼夜温差大,为晚播麦苗早出苗,早分蘖、育壮苗创 Due to lack of accumulated temperature during wheat growth, the late-sowing wheat fields in mountainous areas can not meet the requirements of early-onset and strong seedling growth. As a result, the number of spikes, the number of grains reduced and the grain weight per acre reduced, making it a “pull leg place” for increasing wheat yield in mountainous areas. In order to improve the yield of late-sown wheat fields in mountainous areas, a film-mulching test of late-sown wheat fields was carried out in 1983-1984. The test was carried out on the site I tested (175 meters above sea level). A total of November 14, 24, December 5, and January 11 four seeding, cover film processing. To different sowing time (not covered with plastic film) as a control. Community area of ​​0.02 acres, three repetitions, random block arrangement. Wheat varieties Zheng early. Seeds per acre 20 kg. Stimulation of semen fertilizer before planting 40 acres of urea, superphosphate 50 pounds. Cover the mulch immediately after sowing. Film specifications for the general transparent plastic film. The test results are as follows: First, the significant effect of increasing yield As can be seen from Table 1, the coverage of different sowing dates increased compared with the control, and its yield increase increased with the delay of sowing date. This fully shows that late-maturing wheat field covering plastic film is one of the effective measures to increase wheat yield in mountainous areas. Second, the yield factors have been strengthened to cover the film of late-sowing wheat fields, the film is permeable to light, the temperature difference between day and night in the film is large, early emergence of late-sowing wheat seedlings, early tillering, nurturing seedlings