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The advantage of organic fertilizer is that it contains many kinds of nutrients, including a large amount of various nutrients, and contains a large amount of active substances such as organic substances and vitamins.
Perennial application of organic fertilizer can renew or improve soil organic matter, improve soil physical and chemical properties, and significantly improve soil quality. However, the disadvantage is that the nutrient content is low, and the nutrient form is mainly organic, and needs to be gradually decomposed by the soil microorganisms to be converted into a form that the plant can absorb and utilize, so the nutrient supply intensity is low, and it is difficult to meet the needs of the rapid growth period of the high-yield crop.
In the application, it is necessary to take into account the characteristics of various types of organic fertilizers, and not only the characteristics of the organic fertilizer, but also the application of the appropriate fertilizer. In terms of waste generated by livestock and poultry farming, the amount of such organic fertilizer is very large, and it grows extremely rapidly with the rapid development of livestock and poultry production. If it does not make great efforts to scientifically treat livestock manure and Application will not only cause vegetables, fruit trees, and many economic crops such as tobacco, tea, and potatoes to lose large quantities of cheap and good fertilizer resources, but also reduce the yield and quality of such agricultural products, which will cause environmental degradation in the agricultural areas, which is not conducive to new Rural construction. Therefore, it is the first to fully develop and rationally apply the source of organic fertilizers for manure and urine in the production of economic crops. Because the main characteristic of manure-organic organic fertilizer is that the nutrient content is higher than other organic fertilizers, its carbon-nitrogen ratio (C/N) range is relatively narrow, generally between 6 and 10. For this reason, it is necessary to add partially crushed straw. Mixed organic fertilizer application. This will not only clean the rural environment but also ensure the quality and safety of fruit and vegetable agricultural products. The application of organic fertilizers for manure and urine can partially replace the supply of nitrogen and phosphorus nutrients to chemical fertilizers, thereby reducing the application rate of chemical fertilizers and increasing the utilization rate of chemical fertilizers.
In addition to cash crops, it is necessary to correct a tendency that rice production in food crops depends only on chemical fertilizers and not on organic fertilizers. In the long run, not only is food production difficult to sustainably grow, but agricultural non-point source pollution is also increasing. When recommending organic fertilizer application to a large number of farmland, we must first pay attention to the type, source and composition of organic fertilizer. The field organic fertilizer should focus on returning straw to the field, properly blending with chemical nitrogen fertilizer, adjusting its carbon-nitrogen ratio, and promoting decomposition of organic matter. The activity and optimization of soil microbial communities. If Daejeon wants to apply a large amount of organic fertilizers for manure and urine, not only the fertilizer source is difficult to guarantee, but also the organic fertilizer of manure and urine has little effect on the improvement of soil organic matter and fertilization in the field. The main function is to promote the circulation and renewal of organic matter. Urine organic fertilizer should be mainly used in the production of economic crops, especially new vegetable fields and new orchards.
In the modern intensive crop cultivation system, the rational use of organic fertilizer should pay attention to:
First, the manure cannot be applied and must be decomposed and subjected to a heap conversion process. It is necessary to make a large amount of dispersed raw manure and urine into a qualified organic fertilizer. At present, there is a lack of labor in the rural areas. After the manure is taken out, it often accumulates in the village roadside for several months or even half a year, allowing it to be exposed to the sun and rain, causing the ammonia volatilization of the manure and urine fertilizers and the loss of nitrogen and potassium nutrients and the pathogens. Spread. When it comes to spring agricultural production of the fertilizer, go straight to the ground. This is an unscientific approach and this phenomenon should change.
Second, moderate application. In the practice of controlling the amount of manure, EU countries have proposed regulations for controlled application. In the case of the United Kingdom, the application rate is set at 170 tons (nitrogen) per hectare. However, in recent years, in the production of vegetables and orchards in some areas of China, the application rate of manure per mu has reached an average of 2 tons or more, and some vegetable fields have reached 10 tons. This blind and generally high manure application rate has caused vegetable fields. Nutrient accumulation and water pollution. Because the manure is rich in organic nitrogen, the final product of its decomposition is also nitrate, which also pollutes the water and the environment. The manure may also have problems such as excessive heavy metals.
Therefore, in China's high-intensity intensive economic crop production, the technology of soil testing and formula fertilization should be applied, and the amount of organic fertilizer and chemical fertilizer should be standardized. Advocate the application of organic fertilizer and chemical fertilizer. The proportion of nitrogen supply suitable for each of them is preferably half of each.
For the fertilization of high-input and high-yield economic crops, it is necessary to pay attention to the controlled application of manure, which is scientific and reasonable. In today's increasingly developed aquaculture industry, excess manure should be applied to the field of food crops, which will be conducive to the sustainable development of China's food production and reduce the harmful emissions of some farmland.
Third, in addition to fermentation conversion, manure production should also adjust the carbon to nitrogen ratio, add straw components, widen the carbon to nitrogen ratio, and improve the soil improvement function of manure.
In short, in the high-yield crop production system, the application of organic fertilizer is only reasonable and sustainable, and those one-sided fertilization concepts are not conducive to high-quality, safe production. It should be said that the combination of organic fertilizer and chemical fertilizer is a scientific fertilization strategy.
(Senior Consultant of Sinofert, Professor of China Agricultural University, Cao Yiping) 
In modern intensive agricultural planting, fertilization is not only to obtain crop yield increase and income increase, but also to fertilize soil to improve farmland quality and achieve high yield, high quality and environmentally friendly sustainable development. Therefore, in recent years, there has been a tendency to pay attention to the application of organic fertilizers and chemical fertilizers.
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