【摘要】 1996 - 2 0 0 0年 5 a在 8个试区的测试结果表明 ,宁南山区苜蓿鲜、干草产量分别为 2 1740和 6 90 5 kg/ hm2 ,属低产区。灌水能提高苜蓿产草量 ,并减缓衰退过程。施肥能显著提高苜蓿产草量 ,纯 N施肥量应在 30 0 kg/ hm2 。适宜播种量为 7.5～ 15 kg/ hm2 ,田间密度宜在 2 0～ 40株 / m2 。为提高越冬率 ,苜蓿播种期不能早于 4月下旬 ,也不能晚于 8月中旬。选用 DEI、美国杂交和 SD等高产优良苜蓿品种是提高宁南山区苜蓿产草量的重要技措。更多还原

【Abstract】 In the background of low alfalfa production status,and in needs of industrialization and crop cultivation discontinuation for forestry and grassland,ways of fertilization,irrigation,plantation and good varieties introduction are studied to improve the productivity in this article.From 1996 to 2000,measured yields in 8 plots show that the yield is 21740kg/hm 2 in fresh weight and 6905kg/hm 2 in dry matter in the hilly south of Ningxia autonomous region,which means it belongs to low productivity area.Irrigation can improve the productivity and slacken the process of retrogress.Fertilization can also improve the productivity and pure N fertility should be about 300kg/hm 2.Amount of seeding should be 7.5～15kg/hm 2,plant per square meter should be maintained in the range of 20～40.Sowing date should be early to increase the rate of survivals after winter between the last ten day of April and the middle ten day of August.At last,plantation of good acclimated and high yield variety,e.g.DEL,American cenospecies and SD,is an important way of yield improvement.更多还原