Winter Vegetable Seedling Prevention Points
First, the bed soil selection and disinfection In order to prevent the spread of soil bacteria, bed soil should be selected within 5 years of planting the same field of vegetable loam soil, avoid vegetable garden soil. The organic fertilizer mixed with it must undergo high-temperature fermentation and be fully cooked. Bed soil is disinfected and disinfected. There are several methods for disinfection. There are two commonly used methods: First, use formalin to disinfect water and spray 1 cubic meter of 100 kg of water on 1 kg of formalin. The proportion of soil, the liquid sprayed on the bed soil, and then piled up the soil, with a plastic film cover tightly closed 4 to 5 days after removing the film, loose air and let the drug taste full play, can be used after two weeks. The second is medicine and soil dressing. Use 50% carbendazim WP or 70% thiophanate-methyl wettable powder 8-10 g and 10-15 kg of fine bed soil and mix well, 2/3 of the drug soil spread on the bed, after sowing Use another 1/3 for cover soil to make the lower cover.
Second, seed treatment Seed treatment before sowing can greatly reduce the incidence of disease, there are three commonly used methods: one is the warm soup soaking method, soaking with 50 ~ 55 °C warm water for 15 to 30 minutes, and then remove in 20 °C water After cooling, wash with water 2 to 3 times, and then put into a suitable temperature environment for germination; the second is the Pharmaceutical soaking. Use 25% metalaxyl wettable powder and 70% mancozeb wettable powder according to the ratio of 9:1, add water and soak it in 1500 times solution, and soak to prevent seedling stage damping-off. The third is chemical seed dressing. 50% of omeprazole WP or 50% of carbendazim WP is used for seed dressing. The dosage is 0.2-0.3% of the seed weight. Note that the seed must be seeded in the dry state.
Third, to strengthen the seedbed management, control of disease conditions First, we must grasp the appropriate planting density, to prevent overcrowding caused by seedlings crowded. The second is to pay attention to insulation, antifreeze, to prevent seedbed temperature is too low. The third is to soak the bottom of the water before sowing, after the emergence of seedlings to control the humidity, to prevent excessive watering, over-attendance. When the humidity is too high, weeds can be sprinkled with wood ash or dry soil. The fourth is to appropriately expedite the early cover of grass in order to extend the duration of the light while ensuring the seedbed temperature. The fifth is often ventilation, reduce air humidity, reduce the harm of harmful gases to seedlings.
Fourth, chemical control When the diseased seedlings are found, they must be removed in a timely manner and sprayed with bactericide to prevent the spread of the disease. To prevent the damping-off disease, 75% of chlorothalonil WP can be used as 600 times or 70% of Mancozeb as 500 times of liquid, spraying once every 7-10 days, spraying 2 or 3 times in succession; 5% of Hymex Agent 450 times or 75% of chlorothalonil WP 1000 times or 50% of carbendazim WP 800 times; 10% of Double Efficacy can be used to prevent root rot Aqueous agent 200 to 300 times solution or 50% carbendazim WP 400 times spray; control of gray mold available 50% acetaminophen WP 800 times, spray every 7 to 8 days, even Spray 2 or 3 times. Pay attention to timely ventilation after spraying to avoid increasing the humidity of the seedbed.
Most products of Fluorine-Containing Benzaldehyde are a pale yellow liquid. They are playing an important role in fine chemical intermediates, is used as the main raw material for the synthesis of a variety of pesticides, pharmaceuticals, surfactants, polymer monomer mildew. As used in medicine synthesis antihypertensive drugs, antipyretic analgesic anti-inflammatory drugs, anti-cancer drugs, muscle relaxation drugs for synthesizing fluorine cypermethrin, fluorine chlorobenzene daisy cool in pesticides, fluoride and styrene, wherein the polymer of styrene monomer to fluorine can be widely used in the manufacture of the recording material, a thermoplastic resin coating, liquid crystal materials. Currently new miticide is effective pesticide products which is the main raw material of Fluorine-Containing Benzaldehyde.
Fluorine-Containing Benzaldehyde
Containing Benzaldehyde,5-Dichlorobenzaldehyde,3-Bromo-5-Fluorobenzaldehyde
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