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1984—1986年于滟南农学院实验农场对湘油5号(Brassica napus)用地膜覆盖,稻草覆盖和不覆盖(对照)三种处理进行了覆盖栽培的研究。结果表明:覆盖栽培均增高土温和保持土壤水分,尤以地膜覆盖比稻草覆盖更显著。稻草覆盖比地膜覆盖能抑制杂草,和增多土壤中的有效氮、磷、钾素,尤以增多钾素更突出。覆盖栽培促进根系生长,增大叶面积和提高生物产量。但地膜覆盖的在入春后绿叶数减少,p/R比值较低,稻草覆盖的则与此相反。覆盖栽培增产显著,盖蟆的主要是增加第一次分枝的有效角数,而盖稻草则主花序和第二次分枝的有效角均增加。
In 1984-1986, the experiment of covering cultivation of Brassica napus with plastic film mulching, straw mulching and non-mulching (control) was carried out in experimental farm of Taonan Agricultural College. The results showed that the cover cultivation increased the soil temperature and maintained the soil moisture, especially the mulching more significantly than the straw mulching. Straw cover than mulching can inhibit weeds, and increase soil available nitrogen, phosphorus, potassium, especially in the more prominent increase in potassium. Cover cultivation to promote root growth, increase leaf area and increase bio-yield. However, after plastic film mulching, the number of green leaves decreased, the p / R ratio was lower, and the straw coverage was the opposite. Coverage cultivation significantly increased, frog is mainly to increase the effective angle of the first branch, and straw cover the main inflorescence and the second branch of the effective angle are increased.