扁蓿豆生长发育规律的研究

通过4年的种植观察发现,种植第1年扁蓿豆和苜蓿生长都较缓慢,扁蓿豆的越冬率在l～4年内随着生育年限的增加而提高,而苜蓿的越冬率比扁蓿豆稍低.返青都在4月末,从返青到成熟期的生育天数扁蓿豆为120d,苜蓿为103d.生活第2年的扁蓿豆草层最大鲜量出现在30～40cm处,其中叶量占52.4%;生活第2年和生活第3年的苜蓿草层结构最大鲜量都出现在40～50cm处,分别为50.6g和55.2g,比扁蓿豆分别少了12.4g和7.2g.种子产量第3年最高,扁蓿豆为188.4kg/hm2,苜蓿为211.95kg/hm2.扁蓿豆的生育期较长,第1年为150d,第2年为125d,第3年为120d;而生活第2年的苜蓿生育期为120d,第3、4年都为103d.

Study on the Growth and Development Patterns of Medicago ruthenica Grown in Inner Mongolia

In the 2nd year,mowing M.ruthenica between 30 and 40 cm above the ground showed that it cosisted of 52.4% leaves.On the other hand,the weights of M.sativa(s) were 50.6g and 55.2g for the 2nd year and the 3rd year respectively,when mowed between 40 and 50cm above the ground.The highest fresh pile weights of M.ruthenica during the 2nd and 3rd years were higher than the highest weights of M.sativa by 12.4g and 7.2g,respectively.Their weights in the 3rd year were the highest and M.ruthenica and M.sativa were 188.40 kg/hm~2 and 211.95 kg/hm~2,respectively.The growth duration of M.ruthenica was always longer than that of M.sativa.In the 1st year,the growth duration of M.ruthenica was 150 days compared with 136 days in M.sativa.However,it became 118 days in M.ruthenica and 103 day in M.sativa in the 4th year.