(1) Compound fertilizer has a variety of nutrient elements, the ratio of nutrient is reasonable, fertilizer efficiency and utilization rate are relatively high. Although the chemical composition of the compound fertilizer is not even as the compound fertilizer, the nutrient ratio of the same compound fertilizer is fixed, and the compound fertilizer can be formulated into special series according to the nutrient status of different types of soil and the required fertilizer characteristics of the crop. Fertilizer has strong pertinence and significant fertilizer effect, and fertilizer utilization rate and economic efficiency are relatively high.
(2) Compound fertilizer has a certain compressive strength and particle size, good physical properties and easy application.
(3) Complete nutrients of compound fertilizers can promote soil nutrient balance. Farmers habitually apply more single fertilizers, especially partial nitrogen fertilizers, and rarely use potassium fertilizers. The application of organic fertilizers is also becoming less and less, which can easily lead to unbalanced soil nutrients.
(4) Compound fertilizer is beneficial to the popularization of fertilizer technology. Soil testing and formula fertilization is a technically strong, demanding and wide-ranging work. How to send this technology to households has always been a difficult problem to solve. Although the soil and fertilizing department can provide farmers with formulas through soil testing, and the farmers themselves purchase single-element fertilizers for compounding, it is labor-intensive and is limited by fertilizer supply conditions, which is difficult to promote in large areas. Formula fertilization technology through the use of special compound fertilizers this material carrier, truly technical integration, can better solve the above problems, thus greatly accelerating the application of formula fertilization technology.
Disadvantages: First, the nutrients contained in the application at the same time, some nutrients may not coincide with the period of maximum fertilizer requirements of the crop, easy to lose, it is difficult to meet the special requirements of the crop at a certain period of nutrients; Second, the fixed nutrient ratio of compound fertilizer It is difficult to meet the requirements of various types of soil and various crops at the same time.
Compound fertilizers can be used as base fertilizer and top dressing. Different types of compound fertilizers should be selected for different crops and different soils.
1 Low-level compound fertilizers are generally used for crops with short growth periods and low economic value. Medium and high-concentration compound fertilizers are suitable for crops with long growing periods, large amounts of fertilizer, and high economic value.
2*basic compound fertilizers are generally suitable for dry soil and chlorine-sensitive economic crops. Chlorine-based compound fertilizers are generally applied to paddy fields, rainy areas, and chlorine-insensitive crops.
3 The compound fertilizer containing ** phosphorus should not be applied on the slopes of paddy fields and rainy areas. Compound fertilizers containing calcium, magnesium, and phosphate are suitable for application on acidic soils.
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