陕北黄土丘陵区旱地春谷200～250kg／亩稳产栽培问题的研究

Research on Stable-Yielding Cultivation of Rainfed Land Spring Millet with Yield or 200～250kg/mu in Loess Hilly Regions In Northern Shaanxi

陕北黄土丘陵区春谷亩产２００～２５０ｋｇ的限制因子是地力不足，管理粗放，密度偏低，降水利用率过低，而不是降水量不足。通过采用增产潜力大的旱地春谷品种，适期播种，科学施肥．防止生长后期脱肥，结合沟垄、水平沟、丰产沟等水土保持耕作法，推广宽行小株距种植，增加种植密度，以水、肥保密，使旱地春谷亩产从７１～１５０ｋｇ提高到２００～２５０ｋｇ，并达到稳产。

The major constraints to spring millet yield of 200～250kg/um are notthe rainfall sliortage but poor land fertility,rough management,low plant density,lowerrainfall use efficiency。 The yield of spriiig millet was greatly improved from the original71～150kg/mu to 200～250kg/mu,remaining stable throtigh the adoptation of such im-portaiit measures as usiiig rainfed land spring millet seeds with great yield potential,sowing in right time,scicntific fertilization,preventing fertilizer shortage in late stage,combining of stich coiiservation tillages as ridge and furrow cultivation,level ditch culti-vation,bumper harvest ditch cultivation with the extenision of broad row and narrowspacing planting,increasing plant density guaranteed with water and fertilizer。