In the past two years, food prices have been sluggish and the benefits of growing grain have been low. Many growers have switched to other cash crops, such as lotus roots, which are grown in many areas. In order to ensure the efficiency of lotus root planting, we must do the work of weeding, pest control, etc. in the process of growth, how to do it? Let's take a look at it.
First, lotus root herbicide
Previously, I saw a judicial case on the Internet that caused a dispute over the application of herbicides in Putian caused by the excessive use of “Popular Grassâ€. According to reports, Putian is 7-20 days after planting, can use the drug pure drug 20-25 g / acre, spray or soil law, after the drug to keep water 3-5 cm 5-7 days, and the case in the agricultural materials The dealer did not normally guide the plaintiff to use 50% of the grass net 80 grams * 2 packs of one acre (pure medicine 80 grams / acre), resulting in serious phytotoxicity.
At the recommended dose of 1125g/hm2 (pure drug 72g/mu), the leaves quickly appear burning black spots, the leaves are burnt black, the lotus leaves will gradually die, and the newly grown leaves have no phytotoxic symptoms; when the dose reaches 2 When the recommended dose is 2250g/hm2 (144g/mu for pure drug), the lotus leaves will quickly turn yellow to death within a few days. Therefore, we must pay attention to the dosage and usage when using herbicides.
Second, lotus root weeding used in various periods of medicine
1. 7-10 days after transplanting lotus root, you can choose 50% acetochlor 80-100 ml mixed with urea or fine soil, pay attention to the water layer of about 5 cm in the field, which can close the grass in Bailiantian. grass. It can be applied once more after one month, and the grass control effect is very good.
2, 15-20 days after transplanting lotus root, 20% metolachlor and bensulfuron-methyl 30g mixed with urea, also need to pour 5 cm of water layer, water retention for 5-7 days.
When the pure dose of metformin is 15 grams, the leaves will be scorched and curled, and the whole leaves will be scorched and will die in less than 1 week. When the pure amount of bensulfuron-methyl is 3 grams, the edge of the leaves will appear. Curled, with brown spots, gradually getting darker, and finally the leaves are severely curled and die.
3, optional rice Jie (pentaflufenacil), the amount can be up to 4 grams of pure drug, can control valerian, annual sedge and many broadleaf grass, etc., no effect on lotus leaf growth.
4. In the 3-4 leaf stage of grass weeds, drain the water layer of Putian, using 10.8% high-efficiency flupirtine emulsifiable concentrate or 15% flupirtine emulsifiable concentrate 40 ml, 15% quizalofol emulsifiable concentrate 30 ML, 24 ml of 24% ketene EC, 45 kg of water, spray the weeds when the dew is dry.
5, to prevent moss (shui Mian), with 5mg / kg copper sulfate control.
Note: The above chemical agents are in unused areas. Please pay attention to the small area test in the corner of Putian before use.
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