冷床双膜育苗比冷床单膜育苗提前3—5天出苗,采苗量每平方米增加300—500株,且苗齐、苗壮,既节能又省工易行,其技术要点如下: 1.育苗时间。栽播春薯和夏薯采苗圃育苗时间为3月上中旬,麦垄套种育苗时间可推迟到3月底。 2.下种量。每亩75公斤,其中50公斤用来栽 Cold bed double-membrane nursery nursery than single bed nursery 3-5 days in advance emergence, mining seedlings per square meter increased 300-500, and Miao Qi, Miao Zhuang, both energy-saving and easy to work, the technical points are as follows: 1 Breeding time. Planting sweet potato and summer potato seedling nursery nursery for the time in mid-March, wheat Ridge interception seedling time can be postponed to the end of March. The next species. 75 kilograms per mu, of which 50 kg for planting