丽江县主产包谷,60年代以来改革耕作制度,连作改套种,为推广杂交包谷,提高两季产量起了积极作用。全县套种面积4～5万亩。但因早播,气温低,出苗差,共生期长,相互争光争肥。加之春旱威协,包谷缺苗严重,每亩株数少,产量仍然较低。为 Lijiang County, the main package Valley, 60 years since the reform farming system, even for the change of intercropping, to promote the hybrid package Valley, to increase production in the two seasons played an active role. The county interplanting area of ​​4 to 5 acres. However, due to early broadcast, the temperature is low, poor emergence, long symbiotic, fight for each other fights fertilizer. Coupled with spring drought Wei Association, Guotu lack of seedlings serious, fewer strains per acre, production is still low. for