Alkaline compound fertilizer for preventing and improving soil acidification and preparation method of alkaline compound fertilizer

Abstract

The invention discloses an alkaline compound fertilizer for preventing and improving soil acidification and a preparation method of the alkaline compound fertilizer, belonging to the technical field of compound fertilizers. The alkaline compound fertilizer comprises the following raw materials in percentage by weight: 10-30% of urea, 6-40% of diammonium phosphate, 0-30% of potassium sulfate, 1-5% of calcium oxide and 1-15% of calcium carbonate. The preparation method comprises the following steps: taking calcium oxide, calcium carbonate, urea and potassium sulfate in a proportion, respectively crushing the obtained raw materials into powder, uniformly mixing, heating the obtained mixture, feeding the obtained object into a drum-type granulator to granulate, after granulating is completed, feeding the obtained product and diammonium phosphate particles in a proportion into a mixer, and uniformly mixing, so that a finished product is obtained. In the alkaline compound fertilizer, by taking calcium oxide as an alkaline component and taking calcium carbonate as an isolating agent and a pH value buffering agent, an alkaline raw material and physiologically acidic potassium sulfate are premixed so as to obtain particles, and then the particles are mixed with diammonium phosphate particles with a pH value similar to that of the particles, so that a situation that the alkaline raw material reacts with the diammonium phosphate so as to cause the loss of nitrogen elements and the activity reduction of phosphorus elements does not occur.

Description

Technical field [0001] The invention belongs to the technical field of compound fertilizers, and particularly relates to an alkaline compound fertilizer for preventing and improving soil acidification and a preparation method thereof. Background technique [0002] At present, chemical fertilizers are widely used. Most of the nitrogen and potassium in chemical fertilizers exist in the form of sulfate and hydrochloride (such as NH 4 CL, NH 4 SO 4 , KCL, K 2 SO 4 ). When this form of fertilizer is applied to the soil, the cations in the salt (NH4 + , K + ) Is largely absorbed by crops, and the corresponding anion (CL - , SO4 2- ) Still remains in the soil, and the H in the soil + The ions combine to generate corresponding inorganic acids, which lead to soil acidification. This situation is particularly serious in southern my country and protected areas (greenhouses). The pH value of the soil can be as low as 5 or even lower, and the pH value required for the normal growth of crops i...

AI Technical Summary

Problems solved by technology

The traditional way to improve soil acidification is to apply slaked lime Ca(OH) in the soil 2 , the dosage is not easy to control, slaked lime is not stable in the air, it is easy to react with carbon dioxide in the air and lose its activity, and it is inconvenient to apply, which increases labor costs, and may cause damage to crops if applied improperly