“黑土型”退化草地毒杂草防除试验研究

用４种除草剂在“黑土型”退化草地上进行毒杂草防除试验，结果表明，混合除草剂具有良好的防除效果，药的第２年优良牧草干物质疸由９４．８ｇ／ｍ＾２提高到２２３．４ｇ／ｍ＾２，优良牧草盖度由６０％上升到９５％；毒杂草干物质产量由１３２．４ｇ／ｍ＾２下降到１８．０ｇ／ｍ＾２，盖度由９０％下降到１８％。特别是对棘豆属、马先蒿属、橐于属植物的灭效近１００％。

Study on the control of weeds and poisonous plant on Black Soil Type deteriorated alpine meadow

In this study, four kinds of herbicides were used to control the weeds and poisonous plants on Black Soil Type deteriorated alpine meadow. The results showed that the mixture herbicides could effectively control the weeds and poisonous plants. The production of high quality herbage increased from 94.8 g/m2 to 223.4 g/m2 and the coverage of it rose from 60% to 95%. And the dry matter (DM) and coverage of the weeds and poisonous plants decreased from 132.4 g/m2 to 18 g/m2 and from 90% to 18% respectively in the following after spray. The efficiency of the herbicides on controlling some vicious weeds and plants such as Oxytropis, Ligularia, Pedicularis, etc, could nearly reach 100%.