Weishi County farmer Zhang Liuxiu asks: There are many special Putian grasses in their own families, and it is also necessary to manually remove them. Is there a good method for chemical weeding?
Answer: Weeding in Putian mainly starts with two aspects:
First, physical control. 1. Where there are conditions, the regular rotation of paddy crops can significantly reduce weeds. 2. Control water to suffocate weeds. In the initial stage of lotus root cultivation, the depth of irrigation is 2 to 3 cm. When the lotus leaves are 2 to 3, the depth of irrigation can be increased to 10 to 16 cm, and the depth of water can be maintained for 4 to 5 days to kill most of the weed seedlings. 3. For large weeds that have grown on the water surface, they are stepped into the soil immediately after manual removal. 4. At the same time eradicate the field weeds.
Second, chemical weeding. 1. In the weed 3 to 4 leaf stage, row out the Minami Minami water, use 12.5% ​​of the cover grass energy or 35% of the fine stable to kill 40 ml per mu, spraying 50 kg of water, 3 to 4 days after spraying Gradually yellow grass died. 2. When lotus roots are planted for 7 to 10 days, when water temperature is stable above 20°C, 25% of herbicide-ether EC can be used for 500 to 750 ml per mu, or 50% of Praxecol WP can be used for 40 to 50 g per mu, or 25% for weed control. Emulsifiable ether 500 ml per mu, plus 25% diuretic wettable powder 50 grams per mu, respectively, spraying 50 kg of water. 3. Use 25% herbicide ether EC 500 ml per acre plus 25% Prafulanet 50 g per acre to mix, then mix granular soil with fine soil, spread on the field surface, and keep 3 to 5 cm deep water Layers can be seen in 5-7 days. 4. Use 60% butachlor EC per acre 75 to 100 ml, or 12% caustic sorrel EC 125 to 150 ml per acre, spraying in the shallow water layer before the weeds germinate, killing the grass is also good.
When applying chemical herbicides, it is necessary to pay attention to 3 points: First, it is not suitable for spraying in cloudy and rainy days. Second, no spraying is performed when the water temperature is lower than 20°C. Third, it is not suitable for string irrigation between fields after spraying to prevent phytotoxicity.
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