Zinc-containing synergistic urea, preparation method thereof and application thereof

Abstract

The invention provides zinc-containing synergistic urea. The urea is a product obtained by mixing, dehydrating and granulating the following three components in percentage by weight: 0.08 to 0.24 percent of poly-asparaginic acid chelate zinc in mixed aqueous solution, 0.05 to 0.12 percent of poly-asparaginic acid chelate potassium in the mixed aqueous solution, and 99.64 to 99.87 percent of urea in a molten state. Through effective compound of zinc salt of macromolecular chelate state, potassium slat of macromolecular chelate state and the urea, the zinc-containing urea is favorable for promoting the absorption of plants on nutrients during application of the urea, so the utilization rate of the urea is improved in many ways.

Description

technical field [0001] The invention relates to a novel zinc-containing synergistic urea and a preparation method thereof. The invention also provides the application of the zinc-containing synergistic urea in zinc-deficient areas and in the growth of zinc-sensitive crops. The invention belongs to the field of agricultural technology. Background technique [0002] With the development of rural economy and the advancement of agricultural science and technology, the input of chemical fertilizers in my country's agricultural production has been increasing. In the direct input cost of agricultural production, the proportion of fertilizer expenditure has increased from 29% in 1978 to 40% in 2006. Among them, the application amount of nitrogen fertilizer, especially urea, is increasing year by year. In 2006, the average chemical fertilizer application amount (in pure form, the same below) for the production of three kinds of grains (rice, wheat, and corn) was 20.96Kg, of which ni...

AI Technical Summary

Problems solved by technology

[0007] (3) Simple large particle slow-release urea products

However, there are still the following deficiencies in practical application: First, these new urea products are still emphasizing the slow release and decomposition of nutrients to reduce the loss of nitrogen fertilizer, and less consideration is given to strengthening crops in a relatively low nutrient environment. Next, through nutrient enrichment and strengthening the roots of crops so that they have a strong nutrient absorption capacity, the purpose of improving nitrogen use efficiency is achieved; The uptake and utilization of macronutrients, especially nitrogen, is of great importance; especially the latter, which was not addressed in the current study

[0011] Zinc is contained in the soil, but it cannot be fully utilized by crops. The reason is that it is limited by the state of zinc. The zinc that can be absorbed by crops is called effective zinc. It should be in a water-soluble state, a chelated state, or a dilute acid-soluble state, etc. The main factors of effectiveness include: (a) soil pH: Zinc deficiency mostly occurs in soils with a pH value greater than 6.5, and the increase in soil pH leads to a decrease in available zinc; (b) carbonate: generally, the higher the carbonate content in the soil (c) organic matter: the decline of soil organic matter also reduces the available zinc content; (d) improper fertilization: a large amount of phosphorus fertilizer will induce zinc deficiency in crops; (e) a large amount of lime in some areas will change the soil pH can also lead to zinc deficiency

Images