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| Effects of nitrogen inhibitors on cadmium uptake and transport in rice |
| LI Xiao-xue1,2, WANG Yi1,2, XU Chao2, WANG Hua-jing1, ZHANG Quan2, ZHU Qi-hong2, ZHU Han-hua2, HUANG Dao-you2 |
1. College of Geography and Resource Sciences, Sichuan Normal University, Chengdu 610101, China;
2. Changsha Research Station for Agricultural & Environmental Monitoring, Chinese Academy of Sciences, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Changsha 410125, China |
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Abstract To understand the effect of urease inhibitor (NBPT), nitrification inhibitor (DCD), combined with urea as base fertilizer amendment on the concentration of chloride-extractable Cd (CaCl2-Cd) in soil and the Cd concentrations in Fe plaque on rice root surface and in various rice tissues, a field plot experiment was conducted in a typical Cd-contaminated rice paddy. Compared to the control, the amendments of NBPT, DCD, and NBPT plus DCD were significantly reduced the CaCl2-Cd concentration in soil, especially for a reduction of 15% in NBPT plus DCD treatment. Though the amount of Fe plaque was elevated in NBPT plus DCD treatment plots, no significant effect of the amendments on the Cd fixation in Fe plaque was found. Compared to the control, the concentration of Cd in rice grain and the transport coefficients of Cd from root to grain (TFgrain/root), from stem to leaf (TFleaf/stem), and from stem to grain (TFgrain/stem) were decreased by 18.4%, 20.0%, 40.6%, and 38.1% in NBPT plus DCD plots, respectively. The decrease of Cd concentration in rice grain in NBPT plus DCD plots could be explained by the decreased TFgrain/root and TFgrain/stem. The NBPT and DCD separately combined with urea singly applied as base fertilizer is an effective measure to reduce the Cd concentration in rice grain.
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Received: 21 October 2022
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