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所谓“半膜覆盖”是指用化工部门生产的高压低密度聚乙烯薄膜(地膜)或低压高密度废聚乙烯薄膜(微膜)覆盖在两行棉花之间的全部厢面。半膜覆盖栽培,主要是增加单株结铃数,增加早桃,提高单株铃重和纤维品质,从而提高群体生产力;同时由于生殖生长提前,所以衣分和霜前花率明显提高。在同等肥力水平条件下,半膜覆盖的比露地单株成铃增加6个～7个,皮棉产量一般每667平方米增加18公斤～25公斤,增产率20％以上。同时,可改善耕作层土壤热量状况。在相同的气候条件下,使棉株生育期提前12天～15天,因而表现出
The so-called “semi-membrane cover” refers to the chemical sector with the production of high-pressure low-density polyethylene film (film) or low-pressure high-density waste polyethylene film (micro film) Semi-membrane mulching cultivation is mainly to increase boll number per plant, increase early peach, increase boll weight and fiber quality of individual plants, thereby enhancing population productivity; and at the same time, the rate of flower blossoming and frost pre-emergence increased significantly due to the advance of reproductive growth. Under the same level of fertility, the number of bolls covered by the semi-membrane increased by 6 to 7 compared with the open-field plants. The lint yield generally increased by 18 kg-25 kg per 667 m2 with an increase rate of over 20%. At the same time, it can improve soil heat status of plow layer. Under the same climatic conditions, so that the cotton plant growth period of 12 days to 15 days in advance, which showed