关键词: 苜蓿, 适应性, 侧根, 根系发育能力

Abstract: This experiments studies on the adaptation of different alfalfa in Yellow River delta. The results are as follow:Root of alfalfa are mainly distributed in 0~30cm layer below the surface of soil because of the high paretic water and soil salt-It will induced production of secondary roots after its taproot was severed. Developmental secondary roots were one of the main characters for alfalfa to adapt in this region. Root system can greatly declined the content of total soil salt, and increased the contents organic matter and total nitrogen of 0~30cm soil layer, The‘Wudi’ alfalfa had different effect on different soil ions, it can greatly declined the contents of CO₃^2-,C1-,SO₄^2- and Na⁺,and can declined the contents of HCO₃^-,Ca²⁺,Mg²⁺, and K⁺.‘Naiyan’,‘German’ and ‘Wudi’ alfalfa had high root regeneration ability (RRA),RRA of‘Baoding’ and ‘Bilu’ alfalfa in the middle level, RRA of ‘Longdong’ and ‘Tongxin’ were low in the field experiment. In order to develpoment alfalfa industry in this area, We should select high RRA alfalfa cultivars, build water conservancy project and plant alfalfa with high density.

Key words: Alfalfa, Adaptation, Secondary root, Root regeneration ability