双草醚防除水稻直播田杂草的效果和养分的影响

Weeds Control Efficacy of Bispyribac-sodium and Its Effects on Nutrition in Direct Seeded Rice Field

试验研究了20%双草醚悬浮剂防除水稻直播田主要杂草的效果及杂草防除后杂草对氮、磷、钾及水分的影响。试验结果表明,施用20%双草醚悬浮剂防除直播稻田杂草效果显著,防除异型莎草（Cyperus difformis L.）的防效为96.35%~100%,防除鸭舌草（Monochoria vaginalis（Burm.F.））的效果为95.39%~100%,防除旱莲草（Eclipta prostrata L.）的效果为85.42%~100%,防除稗草（Echinochloa crusgalli（L.）Beauv）的效果为68.72%~94.89%。杂草的防除与其对田间养分和水分的吸收呈负相关,有效改善了田间的光照和水肥条件,增产效果显著。

The weeds control efficacy of 20% bispyribac-sodium SC and subsequent effects on absorption of N, P, K and moisture were studied in the direct seeded rice field. The results showed that 20% bispyribac-sodium SC had good control on Cyperus difformis L., Monochoria vaginalis（Burm.F.）, Eclipta prostrala L. and Echinochloa crusgalli（L.） Beauv, which the control effects were 96.35%~100.00%, 95.39%~100%, 85.42%~100% and 68.72%~94.89% respectively. There was a negative correlation between the weed control effects and absorption of nutrition and moisture. With the weeds control, the light penetration rate and water and nutrient conditions were significantly improved, resulting in prominant yield enhancing.