我所从1976开始采用塑料薄膜温床增温的方法,使第一季玉米提前到2月底3月初播种,6月底7月初收获。收获后利用当时高温条件,抓紧把种子晒干于7月5日播种第二季,10月20日左右收获。从而一年完成了两个世代。增温效果三年来我们用聚氯乙稀薄膜做温床的覆盖材料,以竹子荆条做支架;制成拱型床罩,高80厘米,跨度85厘米,床长20米,南北向。这种全面受光式塑料薄膜温床,增温效果显著,早春当外界气温为3℃时, From 1976, I started to use plastic film hotbed method of warming, so that the first season of corn ahead of the end of February early March sowing, early June early July harvest. Harvest after the use of high temperature conditions, pay close attention to the seeds dried in July 5 seeding the second quarter, harvest around October 20. This completes two generations a year. Warming effect Over the past three years we use PVC film to do the hotbed of the covering material, made of bamboo Vitex bracket; made of arched bedspread, 80 cm high, span 85 cm, 20 meters long bed, north-south. This comprehensive light-type plastic film hotbed, significant warming effect, early spring when the outside temperature is 3 ℃,