Pedosphere 14(1): 45--52, 2004
ISSN 1002-0160/CN 32-1315/P
©2004 Soil Science Society of China
Published by Elsevier B.V. and Science Press
A preliminary study on natural matrix materials for controlled release nitrogen fertilizer
DU Chang-Wen, ZHOU Jian-Min, WANG Huo-Yan and LI Shou-Tian
Department of Soil Science and Plant Nutrition, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail:
      A controlled release N fertilizer was developed by the carrier method using natural polysaccharides (PS) and urea. The results showed that mixing of PS and urea led to significant control of urea release. When a cross-linker (boric acid or glutaraldehyde) was added, a better control effect was observed. During a 30 min leaching time the nitrogen release rate from the controlled release fertilizer was nearly constant, which was significantly different from normal urea. One of the controlled release mechanisms was related to space resistance from a large molecular structure. Infrared (IR) analysis indicated that interaction of PS with urea was through a hydrogen bond or a covalent bond. These bonds created an α-helix or high molecular network fertilizer carrier system, which was another reason for a controlled nutrient release. Pot experiment showed that nitrogen use efficiency could increase significantly with a carrier fertilizer
Key Words:  carrier, controlled release fertilizer, nitrogen fertilizer, polysaccharides
Citation: Du, C. W., Zhou, J. M., Wang, H. Y. and Li, S. T. 2004. A preliminary study on natural matrix materials for controlled release nitrogen fertilizer. Pedosphere. 14(1): 45-52.
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