Solution system containing n-butyl sulfo-phosphoric triamide and application thereof

Abstract

The invention discloses a solution system containing n-butyl sulfo-phosphoric triamide. The solution system contains a solvent and n-butyl sulfo-phosphoric triamide dissolved in the solvent, wherein the solvent is one of citric acid ester compounds as shown in the structure formula (I) in the specification, in the formula (I), R1 is C2-C4 alkyl, and R2 is H or C2H5O. The solution system containing n-butyl sulfo-phosphoric triamide, which is disclosed by the invention, is low in volatility and combustibility, is environment-friendly and safe, good in stability, very good in curing resistance and crystallization resistance at a very low temperature (less than minus 10 DEG C), can be mixed and dissolved in water and is wide in application range, applicable to on-scale popularization and wide in application prospect.

Description

technical field [0001] The invention relates to a fertilizer additive, in particular to a solution system containing n-butylthiophosphoric triamide and its application. Background technique [0002] In agriculture, China widely uses urea as a nitrogen fertilizer, using more than 30 million tons per year. After urea is applied to the soil, most of it is hydrolyzed into ammonia and carbon dioxide. This process is produced by certain bacteria and fungi in the soil. Urokinase produced by catalysis. Ammonia and carbon dioxide produced are partially absorbed by plants or volatilized into the atmosphere, resulting in a greenhouse effect, or dissolved in water and lost to rivers and groundwater, polluting water quality. As a result, a large amount of nitrogen is lost from the applied soil. [0003] This hydrolysis process is effectively slowed down by the simultaneous use of urease inhibitors and urea. Among the many types of urease inhibitors, the most effective is n-butylthioph...

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Problems solved by technology

[0005] Introduced in U.S. Patent No. 5698003 is an additive called "liquid amide". In order to prevent the precipitation of n-butylthiophosphoric triamide at a lower temperature, 10wt% N methylpyrrolidone was added, but N Methylpyrrolidone is usually classified as a carcinogenic and teratogenic compound, so the additive is not enough in terms of safety. In addition, the minimum use temperature of the additive is 0°C, and when the temperature is below 0°C, n-butyl Thiophosphoric triamide will precipitate again, and the winter temperature in most parts of my country is below 0°C, so the use of this additive will be greatly restricted

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