During the investigation in the countryside, I often heard farmers say that more and more soil fertilization has been applied. In the past, one kilogram of chemical fertilizer was applied to produce three to four hundred kilograms per mu. However, the application of three to fourty kilograms now has no effect. It really is the appetite of the soil. "Is it increased? Indeed, the appetite for farmland soil has increased in many places for four reasons:

In terms of a single use of fertilizer, it is necessary to eat raw beaks, and to grow roots should be fat. Crops need to absorb a variety of nutrients in their lifetime, such as nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron and other macronutrient nutrients and trace elements such as boron, manganese, molybdenum, zinc, copper and other nutrients. Each of these elements has its own special expertise and it is not possible to find which one is missing in the crop. However, chemical fertilizers are now applied, and most of them contain only one or two nutrients required by the crop. In this way, long-term single application will result in more nutrients in the soil, and there will be less and less, and the yield of crops. It is also determined by the lack of nutrients. For example, phosphorus can promote the division and proliferation of cells in the crop and the synthesis, transformation, and transportation of organic matter, improve the drought resistance, cold resistance, and disease resistance of crops, and increase the yield and quality. If phosphorus is insufficient, stems and leaves will stop. Growth, poor root development, fewer tillers, heading, flowering, delayed ripening, lack of grain, and low yields. For example, if nitrogen fertilizers are used in large amounts in cold-sweeping fields and duck muddy fields where there is a lack of phosphorus, even if they are applied in large quantities, the yield may not go up. Also if there are not many potassium in the paddy fields in the south, such as large-scale application of nitrogen fertilizer and phosphate fertilizer, no potassium fertilizer is applied. Nor can it win high yields. Therefore, fertilization can not be "single hit one", must pay attention to the application of various fertilizers.

Soil compaction A large amount of ammonia and ammonium bicarbonate are used in paddy fields and dry soils, while neglecting the application of farm manure and other organic fertilizers, as a result, the concentration of ammonium in the soil increases, and the calcium adsorbed on the soil colloid is replaced, and is lost as water is lost. In one year, the soil becomes worse and worse, eventually causing compaction, affecting the aeration and permeability of the soil, and affecting the activities of beneficial microorganisms in the soil. The roots of crops grow in this closed soil and affect the absorption of crop nutrients. It will also grow poorly and there will be a variety of physiological symptoms. Even if you apply more fertilizer to this soil, you will not see the effect of increasing the yield.

Improper fertilization, nitrogen fertilizer applied to the surface of rice fields for a long time, the utilization rate is only 30% to 50%, the utilization rate of ammonium bicarbonate is even lower, generally only 26%, and most of the other become ammonia, went to the air. If we can improve the fertilization technology and change the shallow application to deep application, the utilization rate can be increased by 1 or more times. Another example is the use of calcium phosphate phosphate fertilizer in farmland, in order to facilitate maps and field applications in many places, the phosphorus in superphosphate will be quickly fixed by Tianzhong's iron and aluminum, so the Calcium superphosphate should be used in concentrated applications such as hole application or furrow application, or after application with organic fertilizer, and its utilization rate can be greatly improved.

Soil and water loss In many places, due to deforestation and wasteland reclamation and erosion, the surface of the soil is seriously washed away. Most of the nutrients in the soil have been washed away by rainwater. As time passes, the soil becomes worse and worse. The nutrients in the crop can not meet the needs of crop growth, and must rely on the use of large amounts of fertilizer, crops can survive, which is more and more fertilizer crops, one can not be ignored.

The appetite for soil for fertilizers is getting bigger and bigger. There are many reasons for this, and some are caused by human factors. However, as long as we take corresponding measures, the problems are not difficult to solve. First of all, in addition to doing a good job of soil and water conservation, and applying organic fertilizers while applying chemical fertilizers, the application of nitrogen, phosphorus, and potassium must be applied to fertilization techniques. Carry out a general survey of the soil to clarify the distribution of nutrients in the soil, do a good job of soil testing, formula fertilization, and symptomatic use of fertilizers, so as to give full play to the role of various nutrient elements in increasing production. In terms of farming techniques, the rice fields are "comfortable." Soil fertility is the ability of comprehensive performance of water, fertilizer, gas, and heat. In southern China, paddy soils are heavy in soil quality and have long waterlogging time. They often lack heat and gas, and nutrients in the soil are “gaped”. Although this field has a high content of organic matter, the release of fast-acting nutrients is slow, and the supply of fertilizers is poor. Some of them even have “Tianzhong has fat and rice is hungry.” If rice fields of this type are used for paddy fields, it is possible to increase air and heat. Promotes oxidation, and it has been given the effect of "benefiting and promoting blood circulation" in rice fields. According to the trial of cultivating and drying in the sun, the available soil nutrients can be increased by 30% to 40%, and the nutrient release potential in the soil can be used for the absorption and utilization of crops, and the utilization of fertilizers can be significantly improved.

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