苜蓿地菟丝子苗期防除试验

Experiment of preventing and Controlling Cuscuta Chineneie Lam at Seedling Stage in Alfalfa Field

对苜蓿地菟丝子进行种子库调查，并研究了地乐胺对苗期菟丝子的防除效果。结果表明：菟丝子种子主要分布于苜蓿地土壤0～10cm处，多达17733．42万粒／hm^2，20～30cm层无种子分布；在20，25，30℃温度梯度中，菟丝子种子发芽率随温度升高呈有规律的增加；硬实率在60．0％～73．3％；菟丝子从4月份出苗到6月初生长高度为31．9cm，平均生长速度为0．56cm／d；以喷施地乐胺3750mL／hm^2对苜蓿地苗期菟丝子防除效果最佳，为96．7％。

The seed of virulent weed Cuscuta chineneie Lam in the alfalfa filed was investigated. The ex periment was carried out to prevent and control Cuscuta Chineneie Lam at its seedling stage with bulranlin. The result showed that the seed mainly was distributed between 0 - 10 cm, more than 17. 7334 million/hm^2 ,no seed in 20-30 cm; under the temperature of 20℃ ,25℃ ,30℃, the pullulation rate of Cuscuta chineneie Lam seed regularly was increased with the temperature rise; the rate of hard grain was 60.0% 73.3%; from April to early June the height of Cuscuta chineneie Lam was 31.9 cm, mean growing speed was 0.68 cm/d, the effects of preventing and controlling Cuscuta chineneie Lam at its seedling stage in falcata filed,the effect of 3 750 mL/hm^2 was the best one,about 96.7%.