【摘要】 以不同尿素浓度组合3种内吸传导型除草剂,对川西高原人工老芒麦草地苗期混施,结果说明:不同N肥与除草剂混施组合对老芒麦分蘖形成与生长速度有促进作用;第5天不同N肥浓度处理间和总处理间,分蘖数与株高呈现出显著差异;10~35 d总处理间、除草剂间、N肥间、互作间差异均达极显著水平;相同浓度尿素下,不同除草剂对老芒麦生长影响不同,相同除草剂混合不同浓度尿素其影响有差异;除草剂对分蘖抑制顺序为盖阔>2,4-D丁酯>速效,对株高抑制顺序为2,4-D丁酯>速效>盖阔,对杂草防除效果速效>盖阔>2,4-D丁酯;"尿素7500 g/hm2+速效75 g/hm2"、"尿素5000 g/hm2+速效75 g/hm2"、"尿素7500 g/hm2+盖阔27 g/hm2"和"尿素5000 g/hm2+盖阔27 g/hm2"等混施组合,可促进老芒麦分蘖形成、提高生长速度,防除杂草效果明显,适合在生产中推广。更多还原

【Abstract】 In this study,the different contents urea mixed with three kinds of the conduction-type herbicides was applied to the artificial grassland of Elymus sibiricus L.at the seedling stage in the Southwest Plateau Sichuan.The results showed: the mixture with different contents urea and herbicides improved the tillers and growth rate of E.sibiricus L..There was a significant difference between the treatments and the total treatments,between tillers and height of plant in the fifth day;there was a highly significant difference between the total treatments,herbicides,ureas,and interaction in the 10th – 35th.The different herbicides with the same urea content had a different effect on growth of E.sibiricus L.Meanwhile,a same kind of herbicide with different content urea also had a different effect on growth.The herbicides inhibitted the tiller,plant growth,and weed control,etc.The order of herbicide inhibiting tiller,height of plant,weed control was 75 % tribenuron dry SC > 2,4-D butylate > 28 % WP T-Y,2,4-D butylate > 28 % WP T-Y >75 % tribenuron dry SC,28 % WP T-Y > 2,4-D butylate >75 % tribenuron dry SC.The four types of treatments with 7500 g/hm2 urea +75 g/hm2 28 % WP T-Y,5000 g/hm2 urea +75 g/hm2 28 % WP T-Y,7500 g/hm2 urea +27 g/hm2 75 % tribenuron dry SC and 7500 g/hm2 urea +27 g/hm2 75 % tribenuron dry SC significantly improved the tiller,increased growth rate,controlled weeds.Therefore,those mixture were worth applying widely.更多还原