Gramoxone is a non-killing herbicide that can kill both monocotyledonous and dicotyledonous weeds in vegetable fields. It is generally applied before the preparation of vegetables for harvesting, and the vegetable stubble and weeds are killed together. The author had chosen to test the weed growing vigorous lettuce field, and promptly sprayed 150 ml/mu and 200 ml/mu after harvesting the lettuce, and compared with manual weeding and no weed control, and passed a two-month field trial and Observed, the results showed that Gramoxone had obvious controlling effect on the weeds in post-planting areas and significantly increased the yield of post-planted vegetables. The effects were as follows: 1. Gram-free apheresis had good grass control effect on post-planting areas: after medicine On the 7th, 14th, 21st, and 28th days of investigation and development, the control effects of 150g/mu of spray-free traces on weeds were 97.6%, 62.4%, 27.8%, and 23.1%, respectively. The spray-free traces 200ml/mu of weeds. The control effects were 96.8%, 74.5%, 33.3%, and 23.9%, respectively. There was no significant difference from the effect of manual weed control, but there was a very significant difference from the absence of weed control. The plot of no weeding was overgrown with weeds, indicating that Gramoxone had very significant control on the weeds in postharvest fields. 2, Gram-free traces of the effect of post-harvest vegetable production is obvious: the average yield of noodles of 150 ml/mu of the spray-dried vegetables is 13.19 kg, which is 20.8% higher than the control; the average yield of the spray-free trace 200 ml/mu is 13.60 kilograms, an increase of 24.5% over the control; the average yield of manual weeding plots was 13.42 kilograms, an increase of 22.9% over the control; the average plot yield without weeding was 10.92 kilograms. Although there was no significant difference in plant height and leaf thickness between the treated lettuces, the fresh weight per plant of the lettuce in the treated area was significantly heavier than that in the no weeding area. The performance was that the lettuce in the non-herbicized area grew more slender and smaller, and the lettuce production in the weeding area fell. . 3. After treatment without trace, there will be no side effects on the growth of postharvest vegetables, nor any phytotoxicity. Application method: After the vegetables are harvested, they are sprayed at a rate of 150 ml/mu. The weeds and vegetable residues can be killed together, and then the sorghum vegetables are planted. Gram-free traces of the contact herbicide, a few hours after application, weed leaves will die, and the soil does not penetrate the residual drug. Therefore, after one day of spraying without trace, one can prepare and transplant the seedlings.
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