Starch coating material and application thereof in coated sustained/controlled release fertilizers

Abstract

The invention provides a starch coating material and application thereof in coated sustained / controlled release fertilizers. The coating material comprises starch, cellulose, humic acid and a crosslinking agent, wherein the starch accounts for 90.0-95.0% of the coating material by mass; the cellulose accounts for 0-10.0% (except 0) of the coating material by mass; the humic acid accounts for 0-10.0% (except 0) of the coating material by mass; and the crosslinking agent accounts for 0.2-5.0% of the coating material by mass. The starch coating material is used as the coating of the coated sustained / controlled release fertilizers and the coating accounts for 2-30% of the coated sustained / controlled release fertilizers by mass. The coating material has good coating forming property and water resistance and is degradable. Production and application of the material are environment-friendly. The sustained / controlled release fertilizers in different release periods can be prepared by adjusting the proportion of the components of the coating material to the coating material to the granular fertilizers. When the sustained / controlled release fertilizers are prepared by the invention, the used raw materials have wide sources and are cheap and easy to obtain. The preparation method is simple and prone to industrial production.

Description

Technical field [0001] The invention relates to a starch coating material and its application in a coated slow and controlled release fertilizer, and belongs to the technical field of materials and fertilizers. Background technique [0002] At present, due to the unreasonable use of chemical fertilizers and the leaching, transformation and volatilization of chemical fertilizers, huge waste of resources and serious environmental pollution have been caused. Therefore, how to organically combine fertilizer application with crop yield, quality and environmental protection has become the focus of special attention in the field of fertilizer research. [0003] Since the 1980s, the United States, Japan, Canada and other developed countries have shifted their research focus from scientific fertilization technology to the development of new slow- and controlled-release fertilizers, striving to greatly increase fertilizer utilization by changing the characteristics of chemical fertilizers. ...

AI Technical Summary

Problems solved by technology

The advantage of inorganic powder as coating material is that the source of material is wide and the price is low. After the fertilizer nutrients are released, the empty shells left in the soil can be broken by themselves, which not only does not pollute the soil environment but also improves the soil structure and provides some micronutrients. The effect of elements; its disadvantage is that the slow and controlled release effect is poor, the nutrient content is low, and it cannot really meet the requirements of the coated slow and controlled release fertilizer

Generally speaking, the coating formed by organic polymer has better water blocking performance than the film formed by sulfur and other inorganic substances, the surface of the coating is smoother and thinner, and the slow and controlled release effect is better; the disadvantage is that the polymer cost High, the polymer shells remaining in the soil are not easy to degrade, which is easy to cause soil environmental pollution