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Abstract
大田试验条件下研究了不同播种量对紫云英(<em>Astragalus sinicus</em> L.)生长及物质养分积累的影响。试验设7 个处理, 播种量为7.5~52.5 kg·hm<sup>-2</sup>。试验结果表明, 随播种量增加, 紫云英出苗数显著增加, 单株分枝数、单株复叶数和单株重均呈下降趋势。紫云英鲜草产量随播种量增加而增加, 播种量为7.5~30.0 kg·hm<sup>-2</sup> 范围内增产幅度较大, 而播种量>30.0 kg·hm<sup>-2</sup> 时, 若继续增加播种量则增产幅度减小。紫云英种子产量随播种量的增加呈先升高后降低的趋势, 播种量为15.0 kg·hm<sup>-2</sup> 时种子产量最高。播种量对紫云英养分含量影响较小,但显著影响养分积累量, C、N、P、K、Ca、Mg、Fe、Mn、Cu、Zn 积累量均随播种量增加而增加。紫云英翻压做绿肥的适宜播种量为30.0 kg·hm<sup>-2</sup>, 而若以收获种子为目的则播种量以15.0 kg·hm<sup>-2</sup> 为宜。
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