Fertilizer selection is not only heavy fertilizer but also salt effect
In recent years, soil testing and formula fertilization has become an important technical measure for field and protected land cultivation, which contributes to high grain yield, high quality of fruits and vegetables, and improved agricultural economic benefits. However, some soil testing and fertilizer enterprises may easily cause secondary salinization of the soil due to the difference in fertilizer types during the fertilizer application process, which will destroy the soil fertility.
Soil testing and formula fertilization should not only coordinate the proportion of nitrogen, phosphorus and potassium.
The salt efficiency index of the fertilizer is usually used to indicate the effect of different fertilizer types on increasing the osmotic pressure of the soil solution. The salt effect index of various fertilizers is different, and the salt accumulation effect after applying it to the soil is also different. The greater the salt efficiency index of the fertilizer, the greater the potential for soil salt damage. The salt effect indexes of superphosphate, diammonium phosphate and potassium sulfate are 8, 34, 46, respectively, while the commonly used urea, ammonium nitrate and potassium chloride salt index are as high as 75, 105, 116, which is easy to cause in Huanghuaihai area. Soil salt accumulation.
Therefore, in the soil testing and formula fertilization, we must consider the types of fertilizers and their effects on crop growth and soil chemical changes.
Soil testing and formula fertilization, can not ignore the application of organic fertilizer
While the soil testing formula is rationally applied with chemical fertilizers, the appropriate application of organic fertilizer is an important measure to effectively prevent and reduce the surface sedimentation of soil. The application of organic fertilizer and the application of organic materials can also change the soil structure, increase soil cushioning performance and improve soil. Microflora, improve soil nutrient availability, supplement trace elements, promote crop root growth, and reduce environmental pollution.
Soil testing and formula fertilization methods need to be further improved. The purpose of fertilization is to compensate for nutrient losses and insufficient organic matter in the soil. Therefore, in addition to the base fertilizer, the ditch is a better way, and the topsoil is wrong. In recent years, sprinkler irrigation and drip irrigation have been applied in facility cultivation, so that fertilizer and water conservation are not easy to damage the soil structure, soil compaction is not caused, and soil salinization is reduced.
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