To understand responses of Chamaecrista rotundifolia to planting density, the effect of five planting densities (5. 10, 20, 30, 40, 50 plants/m2) on yield, economic characteristics, crude protein and photosyn thetic characteristics of C. rotundi folia were studied. There was an initial increase then a decreasing trend with increasing plant density. Yield of fodder reached a peak value at a planting density of 40 plants/m2, and yield of hay reached a peak value at 30 plants/m2. Crude protein contents of C. rotundi folia were distributed more in leaves than in stems. Crude protein contents initially increased and then decreased with increasing planting den sity , and reached the peak value at a density of 30 plants/m2. The net photosynthetic rate of C. rotundi folia at different planting densities was due to non-stomatal limitation. Synthesize evaluation showed that a planting density of 30 plants/m2 gave the highest hay yield of 3 454. 83 kg/hm2 by C. rotundi folia, and the crude pro tein production reached 625. 83 kg/hm2.%为明确圆叶决明丰产栽培中的最佳留株密度,开展了6种留株密度(5,10,20,30,40,50株/m2)圆叶决明的产草量、农艺性状、粗蛋白产量、叶片光合特性的观测评价.结果表明,随着留株密度的增加,产草量呈先增加后减少的变化趋势,其中鲜草、干草产量分别在40和30株/m2条件下达到峰值；圆叶决明粗蛋白产量随着种植密度的增加,粗蛋白产量呈先增加而后减少的趋势,在30株/m2条件下达到峰值；光合特性研究的结果表明,非气孔因素的限制作用是不同留株密度条件下圆叶决明净光合速率变化的主要原因.综合评价认为,在本试验条件下,圆叶决明丰产栽培的最佳留株密度为30株/m2,干草产量可达3 454.83 kg/hm2,蛋白产量达625.83 kg/hm2.
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