Production method of urea sulfuric acid multi-nutrient functional compound fertilizer

Abstract

The invention relates to a production method of a urea sulfuric acid multi-nutrient functional compound fertilizer. The method comprises the following steps of: preparing a urea-formaldehyde condensate solution, preparing a urea sulfuric acid solution, preparing urea-sulfur-phosphorus slurry, preparing a granular fertilizer and the like. According to the production method disclosed by the invention, medium and low-grade phosphorus ore is taken as a main phosphorous source for producing the compound fertilizer so as to be conductive to sustainable utilization and protection of phosphorous sources in China; urea-formaldehyde is used for providing part of slow-action nitrogen, and a calcium-magnesium-phosphorous fertilizer and the like are used for providing long-action phosphorous and potassium so as to improve the utilization rate of nutrients in the fertilizer, simultaneously provide various trace nutritional elements and improve the anti-lodging and anti-disease ability of crops; and a surfactant and the like are added so as to be capable of improving reaction status and giving fertilizer weeding, soil improvement and other functions to the fertilizer. When the same yield of the crops is achieved, compared with the existing fertilizer, the total nutrients in the fertilizer disclosed by the invention can be reduced by above 5%, the fertilizer is saved, the synergy is realized, the production cost is reduced by above 10% in comparison with the ordinary compound fertilizer, and the cost is reduced by above 20% in comparison with the existing slow-release fertilizer.

Description

【Technical field】 [0001] The invention relates to the technical field of agricultural fertilizers. More specifically, the present invention relates to a production method of urea-sulfuric acid multi-nutrient functional compound fertilizer. 【Background technique】 [0002] Functional compound fertilizer refers to the general term of compound (mixed) fertilizers with special functions. It refers to fertilizers suitable for a certain (or a certain type) of specific crops in a certain area or fertilizers that contain certain substances and have specific effects. Functional compound fertilizer is a kind of fertilizer that provides crops with two or more nutrient elements in nitrogen, phosphorus, and potassium, and also has other functions, such as weeding, promoting crop growth and development, drought resistance, pest and disease resistance, and Fertilizers for lodging, correcting soil acidity, improving gaseous oxygen content in subsoil, etc. Functional compound fertilizers ha...

AI Technical Summary

Problems solved by technology

However, these fertilizers also have the following technical defects, such as not containing slow-release nitrogen or the content of slow-release nitrogen is not enough to meet the requirements of one-time fertilization, insufficient micronutrient elements, and fertilizers that do not have the ability to enhance crop lodging resistance and disease prevention. ability and increase the gas phase oxygen content of the lower soil and other functions