Matrix-carrier slow-release urea based on rare earth modification and strengthening and preparation method thereof

Abstract

The invention discloses a substrate carrier type slow-release urea based on rare earth modification enhancement and a preparation method thereof. The substrate carrier type slow-release urea based on rare earth modification enhancement searched according to the invention mainly comprises conventional urea, slow-release carrier filler and rare earth; the slow-release carrier filler includes polyacrylamide and a composition; the composition is at least one of crushed lignin, straw, attapulgite and bentonite; the effective components of the substrate carrier type slow-release urea include, by weight: 71-99.97 parts of the conventional urea, 0.01-20 parts of the composition, 0.01-4 parts of polyacrylamide, and 0.01-5 parts of rare earth. The nutrient loading capacity and nutrient slow-release performance of the substrate carrier in \ slow-release fertilizer are improved, utilization rate of the fertilizer is increased, the effectiveness of rare earth elements is improved, the growth and development of plants is benefited, and plant stress tolerance is improved; in addition, the modification process related herein is simple and has a promising application prospect.

Description

technical field [0001] The invention relates to urea and a preparation method thereof, in particular to a matrix-carrier slow-release urea based on rare earth modification and strengthening and a preparation method thereof. Background technique [0002] Chemical fertilizers are important means of agricultural production and the "grain" of food. Since the reform and opening up, my country's agriculture has developed rapidly. my country feeds 22% of the world's population with less than 10% of the world's arable land, but my country's nitrogen fertilizer consumption accounts for one-third of the world's. Excessive and unreasonable application of nitrogen fertilizers reduces the nutrient utilization efficiency of fertilizers, which has brought many harmful consequences, such as a large amount of energy and resource waste, potential environmental risks, decline in the quality of agricultural products and degradation of soil quality, which has a negative impact on the environment...

AI Technical Summary

Problems solved by technology

At present, there are many laboratory studies on matrix fertilizers, and there are few large-scale products. The main problems are: (1) Some of the matrix carriers selected have low nutrient loads, such as hydrogels, etc. The application weight of gel carrier fertilizer is relatively large, the cost of transportation and application is high, and its long-term application may damage the soil physical structure, which is not conducive to large-scale application; (2) select non-renewable minerals, such as vermiculite, zeolite, bentonite and When montmorillonite is used as a matrix carrier, the amount of addition is large, which increases production costs and is not suitable for the sustainable development of modern agriculture; (3) Some carrier-type slow-release fertilizers have weak nutrient slow-release ability and are not suitable for long-term growth. crop nutrient requirements

However, rare earths in the form of conventional agricultural use, such as rare earth chloride or rare earth nitrate, are easily fixed by soil particles and have low effectiveness; while some organic acid complexed rare earths, such as rare earth citric acid, are easily soluble in water, resulting in easy leaching loss , reducing the utilization of rare earth

However, the one-time large-scale application of rare earths will increase the cost of fertilization and cause potential environmental risks

Images