Abstract:

The results of two years＇ test indicate that the grass yield under dry-farming condition is Caoyuan No. 2 〉 Gongnong No. 2 〉 Aohan Alfalfa 〉 Rambler Alfalfa in Kerqin sandy land. The fitting sowing rates of alfalfa are 11.25 - 18.75 kg/hm^2. The safety sowing time for overwinter varieties is from late May to early June. Deep tillage can improve alfalfa＇s yield obviously. Compared with conventional flatten culture to wait rainfall, dry burying too wait rainfall with ridges and furrows make yield increase 30%. It can increase grass yield by using all fertilizer for base fertilizer and dressing fertilizer with rainfall at seeding stage, and the latter has better efficiency. Supplying earth behind freezing-up makes winter-survival rate to enhance 83.4% -93.5%, and deep ditching and fattening in winter are batter than earth supplement of flatten culture. Alfalfa and buckwheat mixed sowing indicates that there is a negative correlation （r = - 0. 958 0） between alfalfa＇s yield and buckwheat＇s sowing rate. Compared sowing at the same time with a alfalfa and buckwheat mixed sowing at different time, we find yield increase about 40.87%. Middle tillage and weeding can enhance alfalfa yield in the alfalfa and buckwheat mixed sowing field.

Key words: alfalfa cultivation, stress resistance and high yield, Kerqin ;andy land

摘要：

两年试验表明,在科尔沁沙地旱作条件下产草量为草原2号〉公农2号〉敖汉苜蓿〉润布勒苜蓿;草用苜蓿适宜播量为11.25～18.75kg/hm^2;5月下旬至6月上旬为安全越冬播种期,深耕能明显地提高苜蓿产量,沟垄作“干埋集雨”较传统的平作播种增产30.13%,“一炮轰”施肥和苗期乘雨追肥可使产草量提高,但乘雨追肥效果更好;封冻前培土能提高越冬率,达83.4%～93.5%,其中深开沟冬磨平比平作培土效果更好。另外,苜荞混播表明,苜蓿产草与荞麦播种量和产量呈负相关（r=-0.958 0）,苜荞分期播种较同期播种产草量增加约40.87%,中耕除草能增加苜荞混播草地的苜蓿产草量。

关键词: 苜蓿栽培 抗逆高产 科尔沁沙地