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为确立噁草酮防除直播稻田杂草稻的施用技术,通过温室盆栽试验比较了噁草酮在不同土壤水分环境下对栽培稻的安全性及对杂草稻的防效,并在大田中比较了不同直播方式下其对杂草稻的防效及栽培稻产量的影响。结果表明,透气条件下,噁草酮对栽培稻的药害最低,但对杂草稻的防效也较差;饱和水分条件下对杂草稻防效较好,150 g(a.i.)/hm~2时其出苗率和鲜重的抑制率达89.61%和61.87%,超过450 g(a.i.)/hm~2时完全抑制出苗;但药后播种对栽培稻安全性较高,600 g(a.i.)/hm~2下对其出苗率和鲜重的抑制率仅分别为38.06%和39.96%,播后施药的药害较重,最低剂量150 g(a.i.)/hm~2时抑制率已分别达88.77%和45.52%;淹水条件下,虽对杂草稻有100%的防效,但也完全抑制栽培稻出苗。大田施用噁草酮300、450、600 g(a.i.)/hm~2,旱直播和水直播方式下杂草稻株防效分别为26.88%、43.54%、44.45%和84.88%、85.74%、90.92%;鲜重防效分别为11.58%、20.16%、27.33%和30.86%、53.68%、80.15%。旱直播和水直播方式下施用量分别超过450、300 g/hm~2时栽培稻产量显著增加。综合分析,推荐水直播整地后泥水状态施用300 g(a.i.)/hm~2噁草酮,水层落干后播种,保持土壤湿润且土表不出现水渍,栽培稻顺利出苗后及时上水且不淹没苗心为宜。
In order to establish the application technology of oxadixone to control direct weedy rice in paddy field, the safety of oxalic ketone to cultivated rice in different soil moisture environments and the control effect on weedy rice were compared by greenhouse pot experiment, and compared in field Effects of different direct seeding methods on the control effect of weedy rice and the yield of cultivated rice. The results showed that oxacillin had the lowest phytotoxicity on cultivated rice under the aeration condition, but its weed control effect was weaker than that under the saturated water condition. ~ 2, the rate of emergence and fresh weight inhibition reached 89.61% and 61.87%, respectively. When more than 450 g (ai) / hm ~ 2, the rate of emergence was completely inhibited. However, ) / hm ~ 2, respectively, the inhibition rates of the emergence rate and fresh weight were only 38.06% and 39.96%, respectively. The phytotoxicity after sowing was heavier, and the inhibition rate was 150 g (ai) / hm ~ 2 Respectively, up to 88.77% and 45.52% respectively. Under flooding conditions, although the weedy rice had 100% control effect, it also completely inhibited the emergence of cultivated rice. The controlling effect of weeds on weeds was 26.88%, 43.54%, 44.45% and 84.88%, 85.74% and 90.92, respectively in the fields with 300, 450 and 600 g (ai) / hm ~ %; Fresh weight control effects were 11.58%, 20.16%, 27.33% and 30.86%, 53.68% and 80.15% respectively. The yield of cultivated rice increased significantly when the application rates were over 450 and 300 g / hm ~ 2 respectively under the conditions of direct seeding and direct seeding. According to the comprehensive analysis, it is recommended to apply 300 g (ai) / hm ~ 2 oxaliclone after muddy water preparation. The water layer is sown and sown to keep the soil moist and the soil does not appear water stains. And do not submerge Miao appropriate.