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5.3 催芽埋根覆膜育苗就是先催芽埋根入圃(方法同前)然后覆盖地膜(也可先覆膜,后埋根)。覆盖地膜可以增温保墒,改善土壤的理化性能,抑制杂草的滋生蔓延,促使苗木根系生长,增加光照效应,有效地改变了由于春季低温、干旱造成的出苗率低、前期生长缓慢的状况;尤其在生长期短、春旱低温的旱原地区效率更为明显。试验表明,覆盖地膜后,4月上旬到6月中旬,可以提高耕作层地温3～5℃,促进种根提早10～12d 左右出土,提前10d 进入速生期,土壤含水量可以提高1％～3％,土壤孔隙度提高3％～4％。
5.3 Germination Buried rooting Seedling is the first germination into the root nursery (method with the former) and then cover the plastic film (also the first film, after burying). Covering plastic film can increase soil moisture, improve physical and chemical properties of soil, restrain the spread of weeds, promote root growth of seedlings, increase light effects, and effectively change the low emergence rate due to low temperature and drought in spring. Especially in the short growing season, spring drought temperature of the drylands more obvious. The experiment shows that after covering the plastic film, the soil temperature of cultivated layer can be increased by 3 ~ 5 ℃ in early April to mid-June, and the seedling root can be excavated earlier by about 10 ~ 12d. The soil moisture can be increased by 1% ~ 3 %, Soil porosity increased by 3% to 4%.