A kind of slightly water-soluble fertilizer and preparation method thereof

Abstract

The invention discloses a slightly water-soluble fertilizer and a preparation method thereof. The method comprises the following the steps of: (1) adding a crosslinking agent into an aqueous solution of a polymer a for reacting, wherein the polymer a is polyglutamic acid, polyvinyl alcohol, polyethylene glycol or polyvinylpyrrolidone; (2) adding an acidifying agent, a crosslinking agent and a mixed monomer into the system in the step (1) for reacting continually; (3) adding an alkalizer and a crosslinking agent into the system in the step (2) for reacting continually, adjusting the pH value to neutral, adding a plasticizer and stirring to obtain a film forming solution, and preparing the film forming solution into a film to obtain a slightly water-soluble material; and (4) granulating thefertilizer and the slightly water-soluble material, and packing with the slightly water-soluble material to obtain the slightly water-soluble fertilizer.

Description

technical field [0001] The invention relates to a slightly water-soluble fertilizer and a preparation method thereof, belonging to the field of interdisciplinary research on water-soluble and wrapped fertilizers. Background technique [0002] There are two main problems in the current slow and controlled release fertilizer products: (1) Coated fertilizer is the main product of slow and controlled release fertilizer at present, and its disadvantage is that the coating material is difficult to degrade, and it is easy to cause secondary pollution and high cost , the reason is that refractory substances are used as the coating material, and the coated fertilizer is developed by using energy-intensive equipment; (2) the coated fertilizer mainly uses thermoplastic (solid) material as the coating material, and the fertilizer product is Nutrient release is mainly affected by accumulated temperature when the soil field water holding capacity is greater than 40%, and nutrients can be ...

AI Technical Summary

Problems solved by technology

[0002] There are two main problems in the current slow and controlled release fertilizer products: (1) Coated fertilizer is the main product of slow and controlled release fertilizer at present, and its disadvantage is that the coating material is difficult to degrade, and it is easy to cause secondary pollution and high cost , the reason is that refractory substances are used as the coating material, and the coated fertilizer is developed by using energy-intensive equipment; (2) the coated fertilizer mainly uses thermoplastic (solid) material as the coating material, and the fertilizer product is Nutrient release is mainly affected by accumulated temperature when the soil field water holding capacity is greater than 40%, and nutrients can be effectively supplied to crops with the change of accumulated temperature; however, when the soil field water holding capacity is less than 40%, nutrient release is inhibited and it is difficult to effectively supply crop demand

However, in relatively arid and semi-arid rain-fed agricultural areas, because the field water holding capacity of the soil is often lower than 40%, it is difficult for the current slow-release fertilizers to release a certain amount of nutrients in time with the rainfall and migrate to the effective absorption range of the crops with the water. Therefore, At present, there is an urgent need to develop a slightly water-soluble fertilizer that can release certain nutrients instantaneously with rainfall or irrigation and has certain slow-release properties.