Novel coated slow-release fertilizer and preparation method thereof

Abstract

The invention relates to the field of slow-release fertilizers and discloses a novel coated slow-release fertilizer and a preparation method thereof. The novel coated slow-release fertilizer comprisesa base fertilizer and a slow-release layer, and the base fertilizer is externally coated with the slow-release layer. The base fertilizer is prepared from, by weight, 20-30 parts of urea, 6-12 partsof calcium superphosphate, 8-12 parts of potassium chloride, 0.3-0.8 part of trace element auxiliary agents and 2-5 parts of an antibacterial additive. The slow-release layer is prepared from, by weight, 2-5 parts of expanded perlite, 5-12 parts of polyvinyl alcohol, 1-3 parts of beta-cyclodextrin, 2-6 parts of epoxy linseed oil, 3-7 parts of modified diatomite, 0.2-0.7 part of eucalyptus oil and7-16 parts of polyacrylamide. By material synergistic effects of the base fertilizer and the slow-release layer, the slow-release fertilizer has advantages of long fertilizer efficiency lasting periodand great slow-release effects and is further excellent in water retention property and capable of improving a soil physiochemical structure, and a material of the slow-release layer is easily degradable and environmentally friendly.

Description

technical field [0001] The invention relates to the field of slow-release fertilizers, in particular to a novel coated slow-release fertilizer and a preparation method thereof. Background technique [0002] At present, slow-release chemical fertilizers are the development direction of agricultural chemical fertilizers in the world. But most of the slow-release chemical fertilizer products in the prior art have the following deficiencies: 1. The coating material cannot be degraded, such as film materials such as petroleum base, epoxy resin, polyethylene, polypropylene, polyvinyl chloride, etc., thereby remaining in the soil , causing environmental pollution. 2. The coating material is poisonous, which is harmful to the health of workers during the production process. 3. The cost of coating materials is too high to be popularized. 4. The slow-release period of the film material is too short, and the effect is not good. Therefore, the development of coated degradable slow-r...

AI Technical Summary

Problems solved by technology

But most of the slow-release chemical fertilizer products in the prior art have the following deficiencies: 1. The coating material cannot be degraded, such as film materials such as petroleum base, epoxy resin, polyethylene, polypropylene, polyvinyl chloride, etc., thereby remaining in the soil in, causing environmental pollution

2. The coating material is poisonous, which is harmful to the health of workers during the production process

3. The cost of coating materials is too high to be popularized

4. The sustained-release period of the film material is too short and the effect is not good

[0004] Chinese patent CN102731214B announces a sugarcane slow-release fertilizer production process, which adopts the fertilizer-wrapped fertilizer process to prepare the wrapped-type high-efficiency slow-release fertilizer for sugarcane, which realizes the combination of nitrogen, phosphorus and potassium three main nutrient fertilizers, forming three Elementary compound fertilizer; according to the nutritional requirements of sugarcane growth, nitrogen fertilizer urea is used as the core layer, potassium fertilizer is the middle layer, and phosphorus fertilizer is the outer layer; it has a slow release effect and can effectively solve the problem of sugarcane fertilization, which consumes a lot of manpower and financial resources. Low yield and low sugar content, the slow-release fertilizer has a short fertilizer effect period and cannot effectively improve the physical and chemical structure of the soil

Images