Preparation method of long-acting slow-release fertilizer special for tea trees

Abstract

The invention discloses a preparation method of long-acting slow-release fertilizer special for tea trees. The preparation method includes following steps: accurately weighing, by weight, 400 parts of formaldehyde, 650 parts of urea, 2 parts of sodium hydroxide, 110 parts of monoammonium phosphate, 120 parts of potassium sulfate, 45 parts of heptahydrate magnesium sulfate and 10 parts of 50% sulfuric acid for standby use; adding urea and sodium hydroxide, heating to 50 DEG C, and holding temperature for 1 h; adding 20% sulfuric acid for solidification, and raking for dispersing; entering a dryer, controlling temperature at 100 DEG C for drying, smashing, and screening; entering the dryer for drying; entering a cooler for cooling; entering a screening machine for screening, enabling materials meeting requirements on grain diameter to enter a packer for packing to be a product, returning excessive thick grains after being smashed into a granulator, directly returning excessive thin grains into the granulator, and repeating the process. The preparation method of the fertilizer is simple, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and relates to a preparation method of a special long-acting slow-release fertilizer for tea trees, in particular to a special high-nitrogen and low-phosphorus type long-acting slow-release fertilizer for tea trees and a preparation method thereof. Background technique [0002] Tea is one of the most important economic crops in my country, with an annual planting area of ​​more than 2.5 million hectares and a total output of more than 1.9 million tons. It is an important crop for poverty alleviation in mountainous areas. At present, there are major problems in tea planting in my country, which seriously affect the yield and quality of tea. Among them, the unreasonable use of fertilizers is one of the important reasons. There are many varieties of tea trees, and different regions lack targeted special fertilizer products that can meet the needs of high-quality and efficient tea production; 2. T...

AI Technical Summary

Problems solved by technology

At present, there are major problems in tea planting in my country, which seriously affect the yield and quality of tea. Among them, the unreasonable use of fertilizers is one of the important reasons. There are many varieties of tea trees, and different regions lack targeted special fertilizer products that can meet the needs of high-quality and efficient tea production; 2. The labor force is scarce, and traditional fertilization methods are time-consuming and laborious; 3. Fertilizer application is unbalanced. In order to pursue production, tea areas generally There are phenomena such as excessive application of nitrogen fertilizer and insufficient application of phosphorus and potassium fertilizers. The comprehensive utilization efficiency of fertilizers is low, and there is a phenomenon of increasing production but not increasing income.

[0003] Because tea trees have a lot of demand for nitrogen fertilizer, and the effect of quick-acting nitrogen fertilizer is short, the fertilization of tea gardens is very cumbersome. The base fertilizer is applied once a year, and the topdressing fertilizer is applied three times a year. , tea production and quality plummeted