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研究了半秋眠和非秋眠紫花苜蓿在上海的生长规律。结果表明:半秋眠和非秋眠紫花苜蓿月产草量呈现“双峰”型变化趋势,第一个高峰值在5月,非秋眠苜蓿的峰值持续到6月;4～6月是两类苜蓿生长较快的时期,期间的累计产草量占全年总产量的53.46%～65.2%;第二个生长高峰值出现在8月份,但明显小于第一个高峰值(p<0.05);7月份两类苜蓿的产量降至谷底,出明显的“夏眠”阶段;非秋眠品种的耐热能力高于半秋眠品种,月株高持续增长期比半秋眠品种长一个月,并且在“夏眠”后株高增加的幅度也高于半秋眠品种。
The growth of semi-fall dormant and non-fall dormant alfalfa in Shanghai was studied. The results showed that the monthly yield of semi-fall dormant and non-fall dormancy alfalfa showed “double peak” type change trend, the first peak in May, the non-fall dormancy peak continued until June; 4 ~ 6 The monthly growth of alfalfa was faster than that of the first peak (53.46% -65.2%). The second peak appeared in August but was significantly lower than the first peak (p <0 05). In July, the yield of two types of alfalfa dropped to the trough, and the stage of “summer dormancy” was obvious. The heat tolerance of non-fall dormancy varieties was higher than that of semi-fall dormancy varieties. Varieties grow one month, and in the “summer sleep ” after the height increase is also higher than the semi-fall dormancy varieties.