内蒙古赤峰地区敖汉苜蓿越冬初步研究

Preliminary Study on the Winter Hardness of Aohan Alfalfa in Chifeng Region.

苜蓿播种当年安全越冬与其生长生物量、分枝数、根颈入土深度及根颈粗细密切有关，引起赤峰地区近几年苜蓿越冬困难的主要原因是生产中苜蓿播种较晚造成其生长量不足和根颈入土较浅。试验表明，适时带肥早播促进苜蓿幼苗快速生长和封冻前浅耕覆土增厚根颈的保温层。

In recent years, there was the difficulty of the living through the winter for Aohan alfalfa (Medicago sativa L. cv. ‘Aohan’) in the country of origin. In April 1997 and May 1998, winter hardness of Aohan alfalfa under natural condition was studid in the Chifeng region. Late seeding time causing insufficient growth and little soil covering of root head were reasons for freezing injury. The measures of early seeding and applying fertilizer to seed and covering soil for root head could raise the winter surviral rate of “Aohan” alfalfa.