Release Characteristics of A New Slow-release Urea Fertilizer and Its Transformation in Soil

doi:10.11924/j.issn.1000-6850.casb17030019

Abstract

Abstract: To explore the nitrogen release and transformation process of a new matrix-based slow-release urea which was produced based on modified organic-inorganic composite materials, laboratory leaching and incubation experiments were conducted to analyze the nitrogen leaching, ammonia volatilization and nitrogen transformation characteristics. Results showed that compared with common urea, matrix-based slow-release urea reduced nitrogen leaching ratio and increased the supply time of available nitrogen. In sand leaching experiment, cumulative nitrogen leaching ratio in common urea treatment reached 98.9% at the 2nd leaching, while that in matrix-based slow-release urea treatment was 62.4%. In soil leaching experiment, leached nitrogen in matrix-based slow-release urea treatment during the 1st-3rd leaching was significantly lower than that in common urea treatment, and thereafter leached nitrogen in matrix-based slow-release urea treatment were generally greater than that in common urea treatment; the cumulative nitrogen leaching amount in matrix-based slow-release urea treatment (144.3 mg N) had no significant difference with that in common urea treatment (146.9 mg N). Ammonia emission peaked at the 3rd day after fertilization in both common urea and matrix-based slow-release urea treatment. However, cumulative ammonia emission in matrix-based slow-release urea treatment was significantly decreased by 41.6% compared with that in common urea treatment. The modified matrix materials had no effect on nitrogen transformation. Matrix-based slow-release urea reduced nitrogen loss from leaching and ammonia emission, and the mechanism is mainly attributed to the mesh structure of functional materials which can adsorb nutrient such as nitrogen.

CLC Number:

S143.1

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