紫花苜蓿播种密度对草产量及其他生物学性状的影响

针对甘肃河西地区紫花苜蓿（Medicago sativa）种植中播种密度过大导致出苗率低、保苗困难等问题，本研究探索紫花苜蓿在河西地区的适宜播种密度。结果表明，在河西地区紫花苜蓿的适宜播种密度为600万粒/hm2，在此密度下草产量和单位面积蛋白质产量最高，分别为24 776.66 kg/hm2和4 924.5 kg/hm2；随着播种密度的增加，紫花苜蓿呈现出返青提前而开花推迟，同期株高增加，耐旱能力下降，干物质含量降低的趋势。

Influence of planting density on grass yield and other biological properties of Medicago sativa

To questioning the higher planting density leading to lower seedling rate and the difficulty of seedling maintenance of Medicago sativa in Hexi region of Gansu,the study investigates optimum planting density of M.sativa in Hexi region of Gansu.The results showed that grass yield depended on planting density of M.sativa.The optimum density was 6 millions grains per hectare.The density gave the highest grass and protein yields,of which were 24 776.66 and 4 924.5 kg/ha,respectively.However,with the planting de...