除草剂茎叶处理对稻田野荸荠球茎的控制效果

Suppression of Herbicides on Corm Formation of Eleocharis plantagineiformis Tang et Wang in Paddy

为了筛选能有效控制野荸荠球茎的除草剂,采用茎叶处理的方法,研究9种除草剂单剂或混剂对桶栽野荸荠球茎形成的控制效果。结果表明,吡嘧.唑草酮有效成分用量54、67.5g/hm2处理后野荸荠球茎的形成完全受到抑制,吡嘧磺隆45、52.5g/hm2处理对野荸荠的球茎数量的抑制率达100%、97.30%,球茎产量的抑制率达100%、98.35%,2甲4氯钠756、924g/hm2对野荸荠球茎数量的抑制率也达95.04%、99.43%,球茎产量的抑制率达95.68%、99.62%,这些药剂处理后球茎大小也显著小于对照;苄嘧.唑草酮57、68.4g/hm2也对野荸荠球茎数量有较好的抑制作用,对其产量的抑制率则较高,球茎大小也显著小于对照;而氯氟吡氧乙酸、2甲4氯.氯氟吡氧乙酸、灭草松和唑草酮对野荸荠球茎数量、产量及球茎大小的影响小。

The suppressions, exerted by nine kinds of herbicides with foliar-treatment, on corm formation of E.plantagineiformis were tested in plastic keg naturally, for screening herbicide to control corm of E. plantagineiformis. The results showed that, the number of E. plantagineiformis corm was completely suppressedby pyrazosulfuron · carfentrazone-ethyl with an active ingredient dose of 54 g/hm2 and of 67.5 g/hm2. Whendose of pyrazosulfuron was 45, 52.5 g/hm2, the inhibitory percentage nearly amounted to 100%. Being treated by MCPA-sodium with an active ingredient dose of 756, 924 g/hm2, the inhibitory percentage was 95.04%,99.43% in number and 95.68%, 99.62% in yield. There was lower suppression in corm number, and efficientinhibition in yield and size after being treated by bensulfuron-methyl · carfentrazone-ethyl at 57 g/hm2 and 68.4 g/hm2. However, there were small effects on the number, yield and size of E. plantagineiformis corm which had been treated by other tested herbicides involving fluroxypyr, bentazone and earfentrazone-ethyl.