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我区地膜覆盖西瓜由1980年的2亩扩大到1983年的530亩,占西瓜播种面积的54%。覆盖方式由高畦、平畦直播覆膜,发展到先用地膜扣小拱棚,后盖地面的一膜两用新形式。经过统计观测,这种新形式较其它覆盖形式有明显的经济效果。根据我国北方春季多风,本地“五一”节前后常有霜冻的气候特点,我们从1982年开始进行了沟棚式地膜覆盖试验。结果表明,较一般地膜覆盖提前7天左右收获,产量增加20%左右。具体做法是: 一、开沟下种,土地必须精耕细作,土壤含水量必须充足。土地整好后,用山地犁开沟,依次向北叠土,头犁过后施肥,再套犁,尔后按所要求的规格整理好。沟宽1.3尺,小埂顶部宽0.8尺,大埂2.6尺,沟深0.9(见图)。用幅宽1.6米、厚0.02—0.015毫米的地膜覆盖两行,两边各用土埋压0.5尺。行距3尺,
The watermelon covered by plastic film in our district expanded from 2mu in 1980 to 530mu in 1983, accounting for 54% of the area planted with watermelon. Coverage from Gao Tuo, flat-screen broadcast film, the development of the first film with a small shed Shed, the back cover of the ground a new form of dual-use film. After statistical observation, this new form has obvious economic effects over other forms of coverage. According to the spring windy weather in northern China and the climatic characteristics of the frost that often occurs before and after the May Day holiday in our country, we conducted a furrow-type mulching test from 1982 onwards. The results showed that the yield was increased by about 20% compared with the average about 7 days before film mulching. The specific approach is: First, under the ditch species, the land must be intensive, soil moisture must be adequate. After the land is finished, dig the ditch with the mountain plow, turn it over to the north, fertilize it after the first plow, then set the plow and then finish it according to the required specifications. The width of the furrow is 1.3 feet, the top of the small furrow is 0.8 feet wide, the big furrow is 2.6 feet and the groove depth is 0.9 (see picture). Cover with a width of 1.6 meters, 0.02-0.015 mm thick film mulching two lines, each side with the buried pressure of 0.5 feet. 3 feet spacing,