The application of organic fertilizer should be enough.

For a long time, people have completely blamed the soil deterioration on the excessive use of chemical fertilizer, and it is believed that the application of more organic fertilizer can not only improve the yield and quality of crops, but also cultivate the land. Therefore, in recent years, many vegetable farmers have spared no expense to increase the amount of organic fertilizer, and some vegetable farmers have applied more than 40 cubic meters of chicken manure per mu of shed land. However, excessive application of organic fertilizer will also affect the physical and chemical properties of soil, and in serious cases, it will lead to a series of adverse consequences, such as soil salt accumulation, affecting crop growth. And excessive input of organic fertilizer will also lead to nitrate accumulation in vegetables, which does not meet the requirements of standardized production of vegetables. What is more serious is that excessive application of organic fertilizers such as municipal solid waste polluted by heavy metals will also cause heavy metal pollution in soil and vegetables. So, how to apply organic fertilizer scientifically and reasonably? The author thinks that we should pay attention to the following points: pay attention to the selection of high-quality organic fertilizer. High-quality organic fertilizer is the basis of high quality and high yield of vegetables, but now most of the organic fertilizers used by vegetable farmers are bought commercial fertilizers, which are generally of low quality, and some are even mixed with municipal sludge and domestic waste, which can not reach the standard of organic matter content at all. Even some bought chicken manure is mixed with soil, or has been mixed with fire alkali by some illegal traders (to increase the volume). After these inferior organic fertilizers are applied to the soil, the effect can be imagined. Therefore, high-quality organic fertilizer must be selected in production, and it is best to choose the one produced by regular large manufacturers when selecting commercial organic fertilizer. Strictly control the amount of fertilizer applied. Since more application of organic fertilizer is harmful than beneficial, we should control its dosage in the future production, so how much per mu of vegetable field can we apply to meet the needs of vegetable production? The author thinks that, in general, it is suitable to apply 15 square meters of pure chicken manure and 35 square meters of rice husk manure per mu of vegetable land, and the fertilizer amount of eggplant fruit vegetables is larger, and the upper limit can be taken. The amount of fertilizer required for leafy vegetables is slightly smaller, and its lower limit can be taken. The application effect of biological fertilizer is good. No matter basic application or flushing application, organic fertilizer had better be used with biological fertilizer. Why cooperate with biological fertilizer? Because after the application of organic fertilizer in combination with biological fertilizer, the biological bacteria in biological fertilizer can accelerate the decomposition of organic matter in organic fertilizer, make it more beneficial to crop absorption, and at the same time decompose and transform some harmful substances in organic fertilizer to avoid causing harm to vegetables. Therefore, in the basic application of organic fertilizer, 150-200 kg of biological fertilizer can be applied per mu, and 20-25 kg of biological fertilizer can be applied per mu.