半干旱区机播保苗综合增产技术研究

The Research on the Comprehensive Yield Increasing Techniques by Keeping A Full Stand of Seedlings Depending on Machine Seeding in Semiarid Area

提出了两套适合吉林省西部半干旱中、低产地区抗旱保全苗夺高产的耕种方法，即抗旱保苗耕种法、玉米日茬覆盖条带深松耕种法，上述两种机播方法均达到了充分利用大气降水、提墒、保墒、保全苗、壮苗、夺高产的目的，产量分别提高２５．０４％～２６．７５％；１５．８３％～２６．０５％，建议在半干旱区农业生产中积极推广这种耕种方法。

The research put forward two sets of cultivating methods that are suitable to droughtresistant for the sake of keeping a full stand of seedlings and gaining high yield in the medium and low yield area of the west part,Jilin Province,i.e.the cultivating method for. drought-resistant and keeping a full stand of seedlings,the strip and deep cultivating method with maize stubbles covering the ground,the above two machine seeding methods have reached the purposes of making fully use of rainfall,lifting moisture from lower layer to surficial layer, keeping the moisture, keeping a full stand of seedlings,making seedlings strong and gaining high yield,and the yields are increased by 25. 04%￣26. 75 %; 15. 83% ￣ 26. 05 %. We suggest that the two cultivating methods should be actively extended in the agricultural production of the semiarid area.