1. Take multiple measures to cultivate robust seedlings If the current high temperature period is improperly managed, the seedlings are prone to become overgrown, and it is difficult to control once the head is over. The vegetative growth and reproductive growth are unbalanced, resulting in serious flower drop and fruit drop, which affects the early yield. Therefore, it is very important to prevent the seedlings from growing up and cultivate strong trees. What factors can cause the seedlings to grow long? 1. High temperature photo In order to reduce the temperature in the shed, many vegetable farmers lay a shading net with a high shading rate or spill excessive mud on the shed film, which results in a low light intensity in the shed and the temperature at night cannot be reduced, which causes the seedlings to see less light during the day and photosynthesis The efficiency is low, the nutrients produced by photosynthesis are low, the temperature at night is high, the nutrients consumed by breathing are more, and the seedlings grow weaker over time. It is recommended that friends of vegetable farmers should not cover the sunshade net all day, and the sunshade should be properly cooled to ensure the required light intensity of the plant. 2. Partial application of nitrogen fertilizer The base fertilizer is mainly manure, and the nitrogen fertilizer content is the highest in the manure, and the phosphorus and potassium fertilizer content is low. Applying a large amount of manure makes excessive nitrogen nutrition in the soil before and after planting, or flushing with nitrogen-containing fertilizer after planting, will cause the seedlings to appear long. 3. Watering Tomatoes, peppers and other eggplant vegetables should not be watered after planting, usually after the first planting water is poured, the second slow watering should be poured every 5 days or so, until the first ear or mango sits Before, no more watering, mainly water control, through drought to stimulate root piercing. Mr. Meng, a vegetable farmer, has unique experience in preventing and controlling the growth of pepper seedlings. He believes that weak root systems and a low root-to-root ratio are important reasons for the growth of the seedlings. In the early stage of cultivating a strong root system, the seedlings will not grow up, but grow up. From this point of view, Master Meng attached great importance to the use of biological bacterial fertilizer in the early stage, on the one hand to prevent soil-borne diseases, on the other hand to promote root growth and development. In the management after planting, increase the temperature difference between day and night, spray boron-containing foliar fertilizer, optimize flower bud differentiation, and prevent falling flowers and fruits. Second, pay attention to avoid root injury before and after planting Before and after planting vegetables, it is inevitable that the root system will be injured, the absorption capacity will be reduced, and the resistance will be weakened. It is easy to create opportunities for pathogen infection and dead trees. Some negligence in the management of vegetable growers tends to increase the damage to the root system and requires special attention. 1. Manure needs to be fermented with bacteria after soil treatment Most vegetable farmers sprinkle the manure into the shed and mix it with soil disinfectant. After the stuffy shed thinks that the manure is also fully rotted, they start to colonize, but later problems such as root burning and gas damage occur. Vegetable farmers don't understand why. When the vegetable farmers use the chemical fumigation shed, although they have also gone through the process of high temperature stagnation, the fumigation fume sterilization is not only capable of killing root-knot nematodes and pathogenic bacteria in the soil, but also various beneficial bacteria in the soil. Dead, without microorganisms, it is impossible to rot manure. Therefore, the application of manure into the shed when it is smoked can only play the role of sterilization and insecticide, but it has no effect of promoting decay. I would like to remind the friends of the vegetable farmers that after using the chemical fumigation shed, they should promptly expose the film to ventilate, plough the soil, and disperse the remaining pesticide thoroughly, and then apply the high-fertility biological agents with the water to promote the complete fermentation of the manure. 2. Watering should grasp the time and degree First, do not water at noon. Some vegetable farmers believe that noon is the highest temperature of the day, and watering just cools down the vegetables. In fact, otherwise, watering at noon can easily lead to the phenomenon of "fried" roots in the root system of vegetables when stimulated by cold water, resulting in a substantial reduction in vegetable production. The watering ****** selection is carried out before 9 am, which can not only achieve the cooling effect, but also not cause damage to the vegetable root system. Secondly, the amount of watering should not be too large. Many vegetable farmers think that in summer, the water evaporates quickly, and it does not matter if the flood is flooded, so the big and small ditch is filled up every time. However, this approach is wrong. Excessive watering in summer can also cause vegetable roots to be rooted, especially in sheds with relatively thick soil and poor air permeability. 3. After planting, it is very important to prevent pests and diseases The "two nets" covering cultivation method can be used to prevent high temperature, insect pests and rain. The two nets mentioned here are shading nets and insect nets. First of all, we should pay attention to the reasonable use of sunshade net, so as not to cover the sunshade net for too long, so that the lack of vegetable light will cause the plant to grow long. The correct time to use the shading net is: around 11 am to 3 pm on sunny days. The shading net should not choose the shading rate is too high, the shading rate is preferably 50%-60%. Secondly, the insect-proof net must be strict. Many vegetable farmers have certain problems with the use of insect control nets, often with inadequate coverage, causing serious pest transmission. In the hot season, in order to improve the ventilation and reduce the temperature in the shed, many vegetable farmers often do not use insect nets on the top vents. At this time, whitefly, leafminer, beet armyworm, armyworm and other insect pests are serious, and the number is large. They often enter the shed from the top vents and doorways, causing serious harm, and also easy to spread viral diseases. It is recommended that the anti-insect net settings should be comprehensive to avoid the occurrence of insect pests. After planting, the diseases were mainly virus diseases and Phytophthora root rot. Viral diseases are mainly achieved through the use of anti-viral varieties and insect control. At the same time, viruses A, Viralin and Ningnanmycin can be used for prevention. Phytophthora root rot can be solved by rooting. You can use 50% DT 500 times mixed with 25% metalaxyl and cymoxanil 500 times solution for root irrigation, about 100 grams per plant. In addition, it is necessary to strictly prevent rainwater irrigation sheds from causing vegetable rot and dead trees, set up rainproof membranes in time, and build shed drainage channels to prevent rainwater from entering the shed. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone Youth Biotech CO,. Ltd. , https://www.youtherb.com