Pedosphere 31(9): 511--520, 2021
ISSN 1002-0160/CN 32-1315/P
©2021 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Rice productivity and profitability with slow-release urea containing organic-inorganic matrix materials
Yang YANG1, Binmei LIU1,2, Xiaoyu NI1, Liangzhi TAO1, Lixiang YU1, Ye YANG1, Mengxi FENG3, Wenjin ZHONG3, Yuejin WU1,2
1Engineering Laboratory of Environment-friendly High-efficiency Fertilizers and Pesticides of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031 (China)
2The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101 (China)
3Henan Xinlianxin Fertilizer Co., Ltd., Xinxiang 453700 (China)
      Applying slow-release fertilizers is possible means for reducing nitrogen (N) loss in rice production. Matrix-based fertilizers represent novel slow-release fertilizers. To date, there is little consensus about the effect of combined addition of organic and inorganic matrix materials on rice production. We developed a slow-release urea fertilizer with selected organic and inorganic matrix materials. The study aimed to:i) determine the effect of the slow-release urea on rice yield, profit, and agronomic efficiency and ii) elucidate its possible mechanisms. A two-year field experiment was conducted during 2015-2016. Besides, laboratory experiments were conducted to determine the potential N loss risk. Three treatments were set up:control without N application (CK), regular urea treatment (RU, 150 kg N ha-1), and slow-release urea treatment (SU, 150 kg N ha-1). The results showed that rice biomass and grain yield were significantly higher in SU than in RU (P < 0.05). The higher panicle density in SU was largely responsible for the greater grain yield. Net profit in SU was > US$450 ha-1, higher than in RU. Agronomic efficiency was significantly greater in SU than in RU (P < 0.05). Rice height, root area, leaf chlorophyll, leaf nitrate reductase activity, and leaf glutamine synthetase activity were larger in SU than in RU. Less N loss and greater soil N availability were partly responsible for the improvements in rice growth traits and physiological parameters in SU. Overall, the slow-release urea is a promising fertilizer for rice production.
Key Words:  ammonia emission,ferric sulfate,matrix-based fertilizer,montmorillonite,nitrogen leaching,path analysis
Citation: Yang Y, Liu B M, Ni X Y, Tao L Z, Yu L X, Yang Y, Feng M X, Zhong W J, Wu Y J. 2021. Rice productivity and profitability with slow-release urea containing organic-inorganic matrix materials. Pedosphere. 31(4): 511-520.
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