关键词: 苜蓿栽培 抗逆高产 科尔沁沙地

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