水直播稻田稗水莎草的危害损失与复合防除指标

摘要

Based on the determination of yield loss of wetland directsowing rice in natural mixed occurring conditions of E.crusgalli and J.serotinus,the pr ediction model of rice yield loss(Y=368.83628.4888X10.3524X2) was established and the economic thresholds under 5 kinds of weeding measures were further derrived. Meanwhile, the corresponding complex weed control targets were advanced, i.e. weeds should be controlled by application of 50%Quinclorac + 10%Pyrazosulfuronethyl or other weeding measures when weed densities in directsowing rice fields reached 1 plant/m2(E.crusgalli) and 30 plants/m2(J.serotinus),respectively.%在稗、水莎草自然混生条件下对水直播稻产量损失测定的基础上,建立了水稻产rn量损失预测模型:Y=368.83628.4888X10.3524X2，并进一步推导出5种不同除草措施的经济阈值，提出相应的复合防除指标，即水直播稻田杂草密度分别达到稗1株/m2和水莎草30株/m2时，需用“二氯喹啉酸+吡嘧磺隆”等除草措施进行防除。