1982—1983年,我们用米拉品种进行本试验.试验分四个处理:(一)亩施150斤菜饼作底肥,20斤尿素作苗肥,不盖地膜;(二)底肥、苗肥同(一),播种后覆盖地膜;(三)亩施300斤菜饼作底肥,20斤尿素作苗肥,不盖地膜;(四)底肥,苗肥同(三),播种后盖地膜。试验地肥力中等,10尺开厢(含沟),做成3尺高畦播种,每畦两行,每行10穴,每穴下种薯两块。每小 1982-1983, we use the Mira varieties for the test.The test is divided into four treatments: (A) 150 kg of cake for the mu base fertilizer, 20 kg of urea as Miao Fei, do not cover the film; (B) the base fertilizer, Miao Fe (A) covering the mulch after sowing; (C) 300 kg mu mu base fertilizer for the base fertilizer, 20 kg of urea as Miao Fei, do not cover the film; (D) base fertilizer, Miao fat with (C), after sowing plastic film. Fertility test medium, 10 feet open (with ditch), made of 3-foot-high mullet sowing, each 畦 two lines, 10 lines per row, each hole two seed potatoes. Every small