【摘要】 2002-2005年进行紫花苜蓿生产力动态研究,发现紫花苜蓿种植不宜沿用传统轮作周期。结果表明,农田灌溉条件下草产量高峰出现在播种后的第2年,株丛密度和1级分枝数大幅下降是草产量下降的主要原因;以初花期作为刈割期,历年各茬平均草产量及其日均增长量均以第2茬最高;随生长年限的增加,紫花苜蓿返青期后延,根颈、根重和根体积增幅逐年减小。试验结果证明,农田灌溉条件下,特别是在较大的刈割强度下,粮草轮作中紫花苜蓿的种植年限不宜太长,应以3-5年为宜。更多还原

【Abstract】 Productivity dynamics of alfalfa were analyzed from 2002 to 2005 in Tongliao.The results showed that the peak of alfalfa yield occurred in the second year under irrigation condition.Yield reduced because of density and tiller of alfalfa decreased with growth years.The average yield per cutting and its increase yield per day were different at the beginning flower stage,the tendency as follows: the second cutting>third cutting>first cutting and last cutting.Diameter,weight and volume of root rise with growth year,but increment became small and the date of turn green delayed.The results also showed planting year of alfalfa should be 3~4 years in irrigation field and cutting four times per year.更多还原