Abstract: Four varieties of alfalfa were studied by no-tillage cultivation method in Anshun karst area,and their growth performance was observed and recorded. The results showed that all the tested alfalfa cultivars could not complete the whole growth period. The difference in total plant height was significant (P < 0.01),stem diameter changed from 1.54 to 2.39 mm,and yield changed from 14 008.7 to 16 218.1 kg·m^-2 (P< 0.05). Biomass was the highest in the third stubble,and the difference of branch number was not significant (P > 0.05). The total effective plant branching number of the common alfalfa cultivar was the highest in the fourth year,which was677 plant·m^-2,followed by Victoria (618plant·m^-2),Sandeli (569 plant·m^-2) and West Star (550 plant·m^-2). The height of regenerated plants was positively correlated with aboveground biomass. According to comprehensive analysis,6-grade fall-dormancy variety Victoria and Sandeli are more suitable for cultivation in Anshun karst area with an elevation of 1 200~1 400mm.

Key words: Alfalfa, Introduction, Growth performance, No-tillage cultivation, Karst area

摘要： 在安顺岩溶区，以4种紫花苜蓿（Medicago sativa）为研究对象，采取免耕栽培方法，对其生长表现进行了观测记录。结果表明，各参试紫花苜蓿品种均不能完成整个生育期，全年总株高差异极显著（P<0.01），茎粗变化1.54~2.39 mm，产草量变化14 008.7~16 218.1 kg·hm^-2（P<0.05），产草量均为第3茬最高，分枝数差异不显著，4年后各参试紫花苜蓿品种有效植株总分枝数普通品种最多（677株·m^-2），其次为维多利亚（618株·m^-2）、三得利（569株·m^-2）及西部之星最少（550株·m^-2），再生植株高度与产草量呈正相关。经综合分析，秋眠级6级维多利亚、三得利适宜于安顺1 200~1 400 mm岩溶区推广栽培。

关键词: 紫花苜蓿, 引种, 生长表现, 免耕栽培, 岩溶区