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Effect of γ-PGA coated urea on N-release rate and tomato growth

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Wuhan University Journal of Natural Sciences

Abstract

The anionic polymer γ-polyglutamic acid (γ-PGA) was used to coat urea and slow its dissolution. Three types of slow release urea (SRU) fertilizers (polymer coated urea with pore constriction, polymer coated urea with enzyme inhibitor and polymer coated urea with pore constriction and enzyme inhibitor) were prepared and tested for the N-release rate. After using SRU, the effect on the tomato growth was analyzed. The extracts of SRU were analyzed for NH3/NH4 +-N and NO3 −-N. The N-release rate was used to determine the optimum ratio of ingredients. The results show that the three types of SRU met the dissolution rate standards recommended by the Committee of European Normalization. γ-PGA SRU increased the chlorophyll content of tomato (flowering stage) by an average of 100% compared with that grew in untreated urea. The results from soil analysis (0-60 cm in tomato pots) indicate that the content of NH3/NH4 +-N in SRU-treated pots was 25%–61% higher than that in soil from urea-treated pots during the growing period, while the content of NO3 −-N was nearly 50% lower after the tomato had been harvested. Newly formulated SRU fertilizer increases nitrogen uptake and reduces loss of applied nitrogen. Plant growth is enhanced, a valuable resource is conserved, and the aquatic environment benefits from decreased level of nitrate in agricultural run-off.

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Authors and Affiliations

  1. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang, 433002, Hubei, China

    Yue Jiang, Liming Liu, Guangfu Luo, J. Davidmark & Yingping Huang

  2. Hubei Yihua Chemical Industry Company, Ltd., Yichang, 443002, Hubei, China

    Zhanli Zhang

Authors
  1. Yue Jiang
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  2. Liming Liu
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  3. Guangfu Luo
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  4. Zhanli Zhang
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  5. J. Davidmark
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  6. Yingping Huang
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Corresponding author

Correspondence to Yingping Huang.

Additional information

Foundation item: Supported by the National Water Pollution Control and Management Science and Technology Major Projects of China (2012ZX07104-002-04), Natural Science Foundation for Innovation Group of Hubei Province, China (2009CDA020, T200703)

Biography: JIANG Yue, female, Master, research direction: polymer materials in the application of slow-release fertilizer.

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Jiang, Y., Liu, L., Luo, G. et al. Effect of γ-PGA coated urea on N-release rate and tomato growth. Wuhan Univ. J. Nat. Sci. 19, 335–340 (2014). https://doi.org/10.1007/s11859-014-1022-4

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  • DOI: https://doi.org/10.1007/s11859-014-1022-4

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