苗期N肥与除草剂混施对老芒麦生长及杂草的影响

Effect of Mixture of Fertilizers and Herbicides on Growth of Elymus sibiricus L. and Herbicide in Seedling Stage

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/hm^2＋速效75 g/hm^2＂、＂尿素5000 g/hm^2＋速效75 g/hm^2＂、＂尿素7500 g/hm^2＋盖阔27 g/hm^2＂和＂尿素5000 g/hm^2＋盖阔27 g/hm^2＂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。

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 con- tents 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 % tfibenuren dry SC 〉 2,4-D butylate 〉 28 % WP T-Y, 2,4-D butylate 〉 28 % WP T-Y 〉75 % tTibenuron dry SC, 28 % WP T-Y 〉 2,4-D butylate 〉75 % tribenuron dry SC. The four types of treatments with 7500 g/hm^2 urea ＋75 g,/hm^2 28 % WP T-Y, 5000 g/hm^2 urea ＋ 75 g/hm^2 28 % WP T-Y, 7500 g/hm^2 urea ＋ 27 g/hm^2 75 % tribenuren dry SC and 7500 g/hm^2 urea ＋ 27 g/hm^2 75 % tribenuron dry SC significantly improved the tiller, increased growth rate, controlled weeds. Therefore, those mixture were worth applying widely.