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在青藏高原高寒草甸地区中华羊茅人工草地上使用2,4—D丁酯灭除双子叶杂草的研究结果表明,适合该地区使用的施药量范围为0.2～0.4毫升/米~2,6月下旬一次施药即可有效控制杂草危害,杂草灭除率达80％以上。在0～0.4毫升/米~2施药量范围内,植物群落主要种群的密度、盖度、高度和地上生物量等均随施药量的改变而发生明显变化。阔叶杂草的上述指际与施药量呈负相关,禾本科牧草的上述指标则与施药量呈正相关。经相关指数检验效果良好。生产试验表明,使用2,4—D丁酯灭除杂草可使牧草产量提高一倍。
The results of the study on the use of 2,4-D butyl ester to eliminate dicotyledonous weeds on the Chinese fescue artificial grassland in the alpine meadow region of the Qinghai-Tibet Plateau showed that the suitable dosage range for this area was 0.2-0.4 ml / m 2 , One pesticide application can effectively control the weeds in late June, and the weed elimination rate reaches more than 80%. Within the range of 0 ~ 0.4 ml / m ~ 2, the density, cover, height and aboveground biomass of the main population of plant community all changed obviously with the change of application rate. There was a negative correlation between the above index and the application rate of broadleaf weeds, while the above indexes of grassy pasture had a positive correlation with the application rate. The correlation index test results are good. Production trials have shown that the use of 2,4-D-butyl can eliminate weeds can double the herd yield.