Water-soluble composite fertilizer with high phosphorus and calcium, and preparation method thereof

Abstract

The invention provides a water-soluble composite fertilizer with high phosphorus and calcium. The composite material comprises, by weight, 10-60 parts of a potash fertilizer, 10-60 parts of a phosphate fertilizer, 10-30 parts of a calcium fertilizer, 2-20 parts of urea and 0.1-5 parts of an anti-caking agent. The invention also provides a preparation method of the water-soluble composite fertilizer with high phosphorus and calcium. The composite fertilizer has the characteristics of high content of total nutrients, stable physical and chemical properties, good powder fluidity, no caking, precipitation or gas bloating at high temperature, low temperature or normal temperature, and good solubility. Phosphoric acid or phosphate is added to a solution obtained by dissolving the composite fertilizer in water to provide an acidic condition in order to make phosphate radicals and calcium ions simultaneously stably coexist in a liquid phase and avoid the generation of calcium phosphate and other insoluble precipitates. The water-soluble composite fertilizer effectively improves the fertilizer utilization rate, has highly concentrated nutrients, is suitable for large-area automatic fertilization, can obviously improve the fertilizing efficiency, and also has the advantages of time saving, labor saving, fertilizer saving and fast fertilizer efficiency.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production, and in particular relates to a large and medium element fertilizer applied to crops, in particular to a high-phosphorus, high-calcium water-soluble compound fertilizer and a preparation method thereof. Background technique [0002] Phosphorus is one of the macronutrient elements necessary for crop growth and development. It is an indispensable element for the formation of nuclear protein and lecithin. Phosphorus can accelerate cell division, accelerate root and shoot growth, promote flower bud differentiation, early maturity, and improve fruit quality. For example, it plays an important role in the respiration, photosynthesis, sugar decomposition and transportation of crops. Phosphorus can promote seed germination, help flower bud differentiation, promote good flowering, and promote early maturation and fruiting; it can also promote root development, making roots grow early and qu...

AI Technical Summary

Problems solved by technology

However, in the liquid phase of fertilizers, phosphate ions easily react with metal ions such as zinc, calcium, and magnesium to form a large amount of precipitation, which greatly reduces the availability of phosphorus and metal ion nutrients, thereby reducing the nutrient utilization rate of fertilizers

At the same time, these insoluble sediments are easy to block the filters and drippers of the drip irrigation system, which will cause great losses to the agricultural drip irrigation system

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