北京地区紫花苜蓿最佳播种量试验

A study of optimum seeding rate of Alfalfa(Medicago sativa) in Beijing

在顺义、通州、平谷和昌平进行不同播量试验 ,从 9～ 2 4kg/hm2 共设 6个处理 ,试验表明 :不同播种量对第 1年紫花苜蓿Medicagosativa的生长影响大 ,随播种量的增加 ,单株分枝数减少 ;在第 1年春季生长时 ,各播量对个体影响不大 ;随着苜蓿生长年限的增加 ,不同播种量对其生长发育的影响逐渐降低 ,产量之间的差异性越来越小 ;北京地区最佳播种量应控制在 1 2～ 1 8kg/hm2 的范围内 ,播种量超过 2 1kg/hm2 则群体生长发育有较大变化 。

Different seeding rate trails were carried out in shuenyi,Tongzhou,Pinggu and Changping seperately,6 treatments ranging 9～24 kg/hm^2.It was indicated that;different seeding rates greatly affected the Ist year Medicago sativa growth,branching no.of single plants decreased with increment of seeding rates.The seeding rates did not hove much influence on single plants in the Ist spring growth.With increased growing years of Alfalfa,different seeding rates had effect on growth/development decreasing gradually,yield defference lessening.Optimum seeding rate around Beijing should be about 12～18 kg/hm^2 .seeding rates over 12 kg/hm^2 will have bigger effect on community growth and development,as to affect the yield.