How to prevent greenhouse vegetable damage

In recent years, there has been frequent occurrence of vegetable damage in greenhouses, and lighter crop production and severe crop failure have affected the income of vegetable farmers. The main reason is that the environment inside the greenhouse is relatively airtight, and ammonia, nitrous acid and other gases generated from fertilizer damage cannot be effectively diffused; or due to the long-term use of certain fertilizers, they lack the rainwater and the leaching of large amounts of irrigation, resulting in these fertilizers. A large amount of accumulated in the soil, causing physiological disorders of vegetables. Mainly manifested as poor root development, less new roots, brown roots, water-soaked leaves above the ground, yellow-white leaves or light brown leaves, severe leaf dehydration and wilting, death of some plants. The following precautions can be taken:

First, soil testing formula fertilization. Based on soil testing and fertilizer field tests, based on the laws of crop manure requirements, soil nutrient performance and fertilizer effects, on the basis of rational application of organic fertilizers, the application quantities of fertilizers such as nitrogen, phosphorus, potassium, and medium and trace elements were proposed. Fertilization period and application method.

Second, increase organic fertilizer, farmyard fertilizer, improve soil fertility. Fresh farmyard fertilizers must be fully decomposed before they can be applied. The application of organic fertilizer can improve soil structure and soil cushioning, reduce fertilizer use, and reduce salt damage.

Third, select the appropriate fertilizer varieties. It is advisable to use chemical fertilizers with less auxiliary components, not to use excessive amounts of ammonium nitrogen fertilizers and ammonium nitrate fertilizers, and to advocate the use of low-nitrogen and high-concentration compound fertilizers.

Fourth, thin fertilizer and ground facilities, control fertilizer dosage. The amount of chemical fertilizers should not be too much. When topdressing, it should be applied sparingly to avoid the harm caused by one-off overuse of fertilizers and the accumulation of salt in the soil.

Fifth, to promote the full depth of chemical fertilizer or ditch applied to cover soil. Fertilizer should not be applied on the surface of the soil. Deep application of the soil can preserve fertilizer, reduce volatilization losses, and reduce direct injury. Acupoints need to be more than 10 cm from the roots of the crop. At the same time, pay attention to fertilization to properly water, keep the soil moist, reduce the solution and avoid high concentrations of fertilization.

Six, the implementation of dry and dry rotation.

Seven, loose soil, ventilate. When it is found that there is gas damage in the shed, loosen the soil in time to release the harmful gas as quickly as possible. At the same time, we must strengthen ventilation and reduce the concentration of harmful gases.

VIII. In the event of fertilizer damage, watering should be done in a timely manner to dilute it in order to solve the problem of fertilizer and fertilizer damage. It is also possible to spray the protective agent or foliar fertilizer on the foliage according to the situation.

Cosmetic Ingredients

Cosmetics are compound mixtures made from various raw materials after reasonable blending and processing. There are many types of cosmetics raw materials with different properties. According to the raw material properties and uses of cosmetics, it can be roughly divided into two categories: base raw materials and auxiliary raw materials. The former is a main raw material of cosmetics, which occupies a large proportion in cosmetic formulations, and is the main functional substance in cosmetics. The latter is responsible for shaping, stabilizing or imparting color, fragrance and other characteristics to cosmetics. These substances are not used in large amounts in cosmetic formulations, but are extremely important. Cosmetics are chemical mixtures made of natural, synthetic or extracted substances with different functions as raw materials and processed through production processes such as heating, stirring and emulsification.

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