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播种量对晚播紫云英生长及养分积累的效应
周 影1, 魏启舜1, 管永祥2, 陈 震2, 王 琳1, 郭成宝1, 文蔚明1
1.江苏丘陵地区南京农业科学研究所;2.江苏省农业技术推广总站
摘要:
大田试验条件下,研究了不同播种量(22.5 ~ 75.0 kg/hm2)对晚播紫云英生长状况、产草量以及养分积累等的影响。结果表明:随着播种量的增加,紫云英每公顷株数显著增加;播种量在30.0 ~ 75.0 kg/hm2范围内单株鲜重和干重随播种量增加而降低;不同处理单株分枝数差异不显著。鲜草和干草产量随播种量的增加呈先增加后减少的趋势,播种量为45.0 kg/hm2的处理产草量最高,鲜草和干草产量分别为48.34 t/hm2和5.70 t/hm2。不同播种量处理的植株地上部碳、氮、磷、钾含量差异不显著,其养分积累量随播种量的增加则先增加后减少,播种量为45.0 kg/hm2时紫云英养分积累量最高,继续增加播种量则差异不显著。综上,晚播紫云英的适宜播量为45.0 kg/hm2,即可获得较高的产草量及养分积累量。
关键词:  紫云英  晚播  播种量  产草量  养分积累量
DOI:10.13758/j.cnki.tr.2020.03.009
分类号:S-3
基金项目:国江苏现代农业(水稻)产业技术体系轮作休耕创新团队项目(JATS [2019] 336)资助。
Effects of Different Sowing Rates on Growth and Nutrient Accumulation of Later-sown Chinese Milk Vetch
ZHOU Ying1, WEI Qishun1, GUAN Yongxiang2, CHEN Zhen2, WANG Lin1, GUO Chengbao1, WEN Weiming1
1.Nanjing Institute of Agricultural Sciences in Jiangsu Hilly Area;2.Agricultural Technology Extension Station of Jiangsu Province
Abstract:
A field experiment was conducted to study the effects of different sowing rates (22.5, 30.0, 37.5, 45.0, 52.5, 60.0 and 75 kg/hm2) on the growth, grass yield and nutrient accumulation of late-sowing Chinese milk vetch (Astragalus sinicus L.). The results showed that with the increase of sowing rate, the number of emerged seedling per hectare increased significantly, however, the fresh and dry weights per plant decreased with the increase of sowing rate in the range of 30.0-75.0 kg/hm2 , and there was no significant difference in the number of branches per plant among different treatments. Fresh and dry yields increased at first and then decreased with the increase of the sowing rate. The highest yield of (48.34 t/hm2 for fresh yield and 5.70 t/hm2 for dry yield) was obtained when the sowing rate was 45.0 kg/hm2.The contents of C, N, P and K in the shoots were insignificantly different between different treatments, while nutrient accumulation was increased in the beginning and then decreased with the increase of sowing rate. The highest nutrient accumulation was obtained when the sowing rate was 45.0 kg/hm2, and no significant difference was found when sowing rate increasing further. Therefore, it is concluded that the suitable sowing rate of A. sinicus in late sowing is 45.0 kg/hm2 which can get the higher grass yield and nutrient accumulation.
Key words:  Astragalus sinicus L.  Late sowing  Sowing rate  Yield  Nutrient accumulation

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