Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2017, Vol. 25 ›› Issue (4): 810-813.DOI: 10.11733/j.issn.1007-0435.2017.04.018

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Effect of the Last Harvest Time on Over-winter Rate and Root Nutrient Content of Alfalfa in Horqin Sandy Land

WANG Wei-dong1, DENG Bo2, WANG Xian-guo2, GAO Kai1, ZHU Guo-li1   

  1. 1. Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028043, China;
    2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • Received:2016-09-05 Revised:2016-12-12 Online:2017-08-15 Published:2017-11-01

末次刈割时间对科尔沁沙地苜蓿越冬率及根系营养物质含量的影响

王伟东1, 邓波2, 王显国2, 高凯1, 朱国立1   

  1. 1. 内蒙古民族大学农学院, 内蒙古 通辽 028042;
    2. 中国农业大学动物科技学院, 北京 100193
  • 通讯作者: 高凯,E-mail:gaokai555@126.com
  • 作者简介:王伟东(1992-),男,内蒙古赤峰人,硕士研究生,主要从事草地资源利用研究,E-mail:1278683334@qq.com;
  • 基金资助:

    重点牧区草原“生产生态生活”配套保障技术集成与示范（2012BAD13B00）；通辽市与内蒙古民族大学科技合作项目（SXYB2012080）；科尔沁沙地苜蓿高效种植技术研究与示范（201403048-2）资助

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Abstract:

Second-year alfalfa grown in Horqin sandy land was cut at different time for the final harvest in this study. The root total nitrogen, soluble sugar, starch, and the following year green-up rate were measured. The results showed that:with the delay of the cutting time alfalfa winter survival rate decreased first and then increased, while alfalfa root total nitrogen and soluble sugar content decreased continuously. And root starch content exhibited an "up-down-up "trend. Last cutting on August 23 had significantly higher winter survival rate, root total nitrogen and soluble sugar content than other cutting time treatments (P<0.05).

Key words: Alfalfa, Over-winter rate, Soluble sugar, Starch, Total nitrogen

摘要：

通过以科尔沁沙地二年生紫花苜蓿（Medicago sativa）为试验材料，测定不同末次刈割时间处理条件下科尔沁沙地苜蓿根系全氮、可溶性糖、淀粉含量及翌年返青率。结果表明：随着末次刈割时间的推迟，苜蓿越冬率呈现先降低后升高的趋势，而苜蓿根系全氮及可溶性糖含量则呈现逐渐降低的趋势，根系淀粉含量则呈现出"升-降-升"的变化趋势，其中8月23日刈割处理越冬率、根系全氮及可溶性糖含量显著高于其他刈割处理（P<0.05）。

关键词: 苜蓿, 越冬率, 可溶性糖, 淀粉, 全氮

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