河西灌区全膜双垄沟播玉米的节灌增产效应

Effects of double ridges mulched with wide plastic film on saving water and increasing yield in corn fields of Hexi irrigation area

对在半干旱雨养区大面积推广的全膜双垄沟播技术作为低成本节灌措施在河西灌区的玉米栽培中进行试验研究.结果表明:在民勤试验点上,全膜双垄沟播处理的增产效果明显,且灌水量减少.其中,生育期灌水量为对照1/2的处理,其灌水量减少2190m3·hm-2,而玉米籽粒产量增加902kg·hm-2.在民乐辅助试验点上,玉米生育期不灌水,尚能获得10000kg·hm-2以上的籽粒产量;且与灌2次水比较,每公顷节水量可达4500m3.说明全膜双垄沟播技术可作为内陆河流域灌区农田的低成本节水措施,可在进一步试验研究的基础上予以示范和推广.

How to save irrigation water in fields has been a critical aspect in Hexi irrigation area.Due to the huge investments,methods such as drip irrigation and sprinkler irrigation are not suitable for grain crops such as corns with relatively low economic benefit.Thus,we applied the technology of double ridges mulched with wide plastic film extensively used in semi-arid rain feed region to the maize culture in Hexi irrigation area.The field experiments were conducted in Minqin and Minle in 2009.The results demonstrated that,in Minqin,the treatment of double ridges mulched with wide plastic film significantly increased the corn grain yield（902kg·hm^-2）and decreased the irrigation amount（2 190m 3·hm -2）comparing to the controlled fields.In Minle site,without irrigation in growing season,we still obtained 10 000kg·hm -2 grain field,and comparing to double irrigations,saved 4 500m3 water per hectare.It concludes that the method of double ridges mulched with wide plastic film could be feasible in irrigation area of inland river basin with low cost to save water.A certain area of further and more thorough experiments will be conducted in order to bring the technology to large scope of demonstration and extension.