冬油菜苗期化学除草效果和经济效益研究

为筛选出经济、高效、安全的化学除草方法，有效控制油菜田间杂草危害，提高油菜产量和种植效益，通过试验，研究了2种化学除草剂不同使用浓度的安全性和苗期化学除草效果，并以人工除草和不除草方法为对照，对比分析不同除草方法的投入和产出情况。结果表明：不同除草方法间油菜产量差异显著；化学除草方法对油菜田间杂草有较好的防除效果，并可显著降低油菜生产的劳动力和生产成本投入，进而提高经济效益；不同化学除草方法均于施药35天后表现出较好的除草效果；每公顷用21.2%喹·胺·草除灵悬浮剂900 mL于油菜4—5叶期、杂草3—4叶期兑水900 kg及时喷施的方法除草效果好，对油菜生长安全，可以作为冬油菜田的苗期化学除草方法在生产上应用。

Winter Oilseed Rape: Effect of Chemical Herbicidal at Seedling Stage and Economic Benefits

To screen out economic, efficient and safe chemical weed control method to control oilseed rape field weeds effectively, and improve yield and benefit of oilseed rape, the authors studied the safety and effects of 2 chemical herbicides at oilseed rape seedling stage with different concentrations. At the same time, the input and output of different weed control methods were analyzed with the CK of artificial weeding and non-weeding. The results showed that the yield of oilseed rape was significantly different between different weed control methods; the chemical weed control method had good control effect on oilseed rape field weeds, it could significantly reduce the input of labor and production cost, and improve the economic benefit. Different chemical weed control methods all showed good weed control effect after 35 days of application; the weed control effect was the best with timely spraying 900 mL 21.2% sinensis·amine·benazolin suspending agent added 900 kg water per hectare at 4—5 leaf stage of oilseed rape and 3—4 leaf stage of weeds, it was safe to oilseed rape growth and could be used as a chemical weed control method in winter oilseed rape field at seedling stage in the production.