Journal of Food, Agriculture and Environment

Characteristics of nutrient release kinetics for organic polymer-coated fertilizers

Author(s):

Y. S. Xiong ^1*, J. F. Yuan ¹, R. G. Hu ²

Recieved Date: 2010-07-04, Accepted Date: 2010-11-06

Abstract:

The relationship between the membrane structure and the nutrient release of fertilizers coated by organic polymer was studied with electron microscope. The structure and thickness of membrane in coated urea and coated ammonium phosphorus (MAP) were determined by scanning electron microscope (SEM). The basic structure of membrane was micro-laminated interlayer surface with tiny granular or ultra-micro hole. The average membrane thickness of coated urea (CU) and coated ammonium phosphorus (CMAP-1) and coated ammonium phosphorus (CMAP-2) was 6.5×10^-5 m, 3.5×10^-5 m and 4.5×10^-5m, respectively. The relationship between the micro-laminated density and thickness of membrane and nutrient release of coated fertilizers was negative. The relationship between the nitrogen nutrient release of coated fertilizers and time was determined by electron ultra-filter (EUF). The findings showed that the first-order kinetics equation could be used to describe the release characteristics of N in the coated fertilizers. The kinetics equations of nitrogen released from CU and CMAP-1 and CMAP-2 were established as y = 2.162x – 3.973, y = 2.817x + 20.867 and y = 2.434x + 4.733.The characteristic of controlled release for coated fertilizer can rapidly be discriminated by electron ultra-filter (EUF).

Keywords:

Electron microscope, membrane structure of coated fertilizer, electron ultra-filter (EUF), nutrient release kinetics

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Agriculture
Pages: 733-735

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