A kind of slow-release fertilizer suitable for water and fertilizer integration and preparation method thereof

Abstract

The invention discloses a slow release fertilizer applicable to water-fertilizer integration. The slow release fertilizer is a nano capsule slow release fertilizer prepared from nutritional ingredients as core materials and a slow soluble film-forming polymer as a capsule wall material. The slow release fertilizer can be evenly dispersed into the water to form a colloidal solution and achieves the slow release and controlled release targets. The invention further provides a preparation method of the slow release fertilizer. The method comprises the following steps: dissolving the slow soluble film-forming polymer into an organic solvent which is not mixed and dissolved with the water; dispersing a core material water solution into the organic solvent to form a water-in-oil W / O emulsion; and adding the W / O emulsion to the water solution containing protective colloid to disperse, so as to form a W / O / W emulsion, and then evaporating a solvent, so as to form the nano capsule. The slow release fertilizer can be evenly dispersed into water to form the colloidal solution, and can be irrigated together with water; and the capsule wall material is a slow soluble film-forming polymer, and can be slowly dissolved into soil to achieve the controlled release target, secondary pollution to the soil is not generated, and the slow release fertilizer has market function value.

Description

technical field [0001] The invention belongs to the field of fertilizers for crops, and more precisely relates to a slow-release fertilizer integrating water and fertilizer suitable for modern agriculture. Background technique [0002] With the continuous increase of our country's population, the demand for food is also increasing. In order to solve the food problem, it is an important measure to vigorously develop modern agriculture. Chemical fertilizers play a very important role in agriculture. The main problems in the use of chemical fertilizers today are large application rates, low utilization rates, and soil pollution. my country's water resources are seriously lacking, and agricultural water consumption accounts for 61.9% of the total water consumption. The annual agricultural water shortage is very large. Drought and water shortage have become one of the main limiting factors that threaten food security and restrict the sustainable development of agriculture. In th...

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Problems solved by technology

The microcapsule organic fertilizer is only a simple water-in-oil W / O type. The microcapsules formed are not very stable, the slow-release effect is not very good, and the particles are relatively large, which cannot be effectively dispersed in water to form a water-soluble suspension. Not applicable Integration of water and fertilizer

[0007] According to the above, the current microcapsule particles in my country are relatively large. Although they can achieve the purpose of slow release control, they are not suitable for the integration of water and fertilizer in modern agriculture. A lot of manpower and time are wasted in the fertilization process, which increases the amount of water used.