3种除草剂对直播早稻田大龄杂草的防除效果

为筛选对大龄杂草高效安全的除草剂,选用10%双草醚SC、10%噁唑酰草胺EC和5%嘧啶肟草醚EC 3种常用药剂研究水稻5叶一心,稗草4叶一心、5叶一心直播早稻田中大龄杂草防除效果。结果表明:10%双草醚SC在16~31℃下安全性比较稳定且对稗草防效好,10%噁唑酰草胺EC在低温下安全性不稳定,防效和安全性都下降,对千金子防效好;5%嘧啶肟草醚EC对阔叶杂草的防效最高,安全性也相对较高,对稗草和千金子防效较差。

Control Efficacy of Three Kinds of Herbicides on Advanced Leaf Age Weeds in Direct Seeded Early Rice Field

In order to screen high-efficient and safe herbicide on advanced leaf age weeds in direct seeded early rice field, 10% bispyribac-sodium SC, 10%metamifop and 5% pyribenzoxim EC were chosen to investigate their control effects when early rice was in the period of 5.5 leaves, Echinochloa spp.was in the period of 4.5 leaves to 5.5 leaves.Results:10% bispyribac-sodium SC had good control and stable safety on Echinochloa spp.at 16~31℃, the control effects were 87.20%;The safety of 10% metamifop, which had good control effects on L.chinensis,was unstable at low temperature, the control effects and safety all descended.5% pyribenzoxim EC had the highest control effects on broad-leaved weeds and bad control effects on L.chinensis, while the safety was relatively higher.