Organic polymer slow-controlled release nitrogen and phosphorus fertilizer containing iron, manganese, copper and zinc microelements and preparation method of organic polymer slow-controlled release nitrogen and phosphorus fertilizer

Abstract

The invention discloses an organic polymer slow-controlled release nitrogen and phosphorus fertilizer containing iron, manganese, copper and zinc microelements. The organic polymer slow-controlled release nitrogen and phosphorus fertilizer is prepared by the following steps: stirring and dissolving phosphoric acid and zinc powder in the molar ratio of 27 to 1 to prepare a component A; adding ferrous sulfate, manganese sulfate and copper sulfate crystal to 50mL of distilled water in the molar ratio of 1.9 to 1 to 0.18; adjusting pH to be 8-10, standing and filtering to prepare a component B; adding the component B to the component A to prepare a product C; enabling urea and formaldehyde to react at 30-35 DEG C in the molar ratio of (5:4) to (2:1) for 40-200 minutes when the pH value is 8-10, then heating to 50-60 DEG C, and further reacting for 30-90 minutes; and adding the product C, adjusting the temperature to be 70-100 DEG C, and further reacting for 30-40 minutes, wherein the reaction solution is in a viscous state; pelletizing and drying to obtain the organic polymer slow-controlled release nitrogen and phosphorus fertilizer containing iron, manganese, copper and zinc microelements.

Description

technical field [0001] The invention relates to a slow and controlled release chemical fertilizer, in particular to an organic macromolecule slow and controlled release nitrogen and phosphorus fertilizer containing trace elements of iron, manganese, copper and zinc and a preparation method thereof. Background technique [0002] At present, there are 17 kinds of essential nutrients that are recognized as indispensable for crop growth, which can be roughly divided into macronutrients, secondary and micronutrients according to the quantity required by plants. The importance of macronutrients such as nitrogen, phosphorus, and potassium has been well known, but the importance of micronutrients is often overlooked because plants have less demand for them. In recent years, with the continuous improvement of crop yields and the gradual decline of the proportion of organic fertilizers in the total composition of fertilizers, the role of trace elements has become more and more obvious...

AI Technical Summary

Problems solved by technology

[0003] Inorganic salt trace element fertilizer is made by compounding the trace elements required by crops in the form of inorganic salt, but the trace elements applied in this form cannot be absorbed by plants quickly and effectively. Metal ions exist in the form of metal ions, which are easily fixed by the soil, so that the fertilizer effect of trace elements cannot be exerted normally.

With the deepening of research, water-soluble metal chelates began to be used as trace element fertilizers, and achieved obvious yield-increasing effects. However, the high production cost of chelates restricted their further development.

[0004] In view of the problems that inorganic salt micro-fertilizers are easy to be fixed, low utilization rate and high cost of water-soluble metal chelates, it is necessary to improve the existing micro-fertilizers and synthesize a slow-release micro-fertilizer to improve the utilization rate and reduce soil fixation on it

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