Chinese Journal OF Rice Science >
Effects of Green Manure Planting and Lime Application on Cadmium Content in Double-cropping Rice Under Controlled Irrigation
Received date: 2023-10-16
Revised date: 2023-11-29
Online published: 2024-03-14
【Objective】Cadmium (Cd) pollution in farmland is a major environmental challenge affecting the development of high-quality rice production in China, impacting both rice commodity value and human health. This study conducted a large-area field trial to investigate the effects of green manure planting and lime application on rice yield and Cd content in grain under controlled irrigation, aiming to provide technical references for rice production safety. 【Method】Early and late rice varieties used in the experiment were Xiangzaoxian 24 and Huarun 2, respectively. The field experiment was conducted in Yiyang City, Hunan Province, where five treatments were set up: conventional cultivation (CK), controlled irrigation (W), green manure + controlled irrigation (GW), lime + controlled irrigation (LW), and green manure + lime + controlled irrigation (GLW). 【Result】Compared with the CK treatment, the average cadmium content in brown rice in the early and late rice under the W, GW, and LW treatments was significantly reduced by 34.5%, 83.5%, and 83.3%, respectively. The average cadmium content in rice grain was significantly reduced by 26.3%, 82.5%, and 83.4%, respectively. As for GLW, compared to CK, the cadmium content in brown rice of late rice was only significantly reduced by 43.7%, and that of rice grain was significantly reduced by 40.8% correspondingly. Compared with the CK treatment, the average cadmium content in rice husk in early rice and late rice under GW and LW treatments was significantly reduced by 71.3% and 74.2%, respectively. However, in GLW, it was significantly reduced by 38.5% only in the late-season rice. The average cadmium content in stems and leaves in early rice and late rice under GW and LW treatments was significantly reduced by 85.3% and 79.1%, respectively, but that of GM was significantly reduced by 51.9% only in the late rice. Compared with the CK treatment, the soil pH value in the early and late rice under the W, GW, and LW treatments was significantly increased by 6.2%, 23.7%, and 20.0%, respectively. The average soil effective Cd content in the early and late rice under the GW treatment was significantly reduced by 20.0% to 22.6% during the filling period. Compared to CK, the GW and LW treatments significantly reduced Cd translocation from early rice hulls to brown rice. Except for the W treatment, where the differences between early rice hulls and late rice stems and leaves were not significant, other treatments significantly reduced the enrichment of soil Cd in stems and leaves, brown rice, and rice hulls. There was no significant difference in rice yield among treatments.【Conclusion】Under flooding irrigation after panicle differentiation, planting leguminous green manure in winter or lime application in spring could ensure rice production safety in lightly cadmium-polluted paddy fields without affecting rice yield.
TANG Zhiwei, ZHU Xiangcheng, ZHANG Jun, DENG Aixing, ZHANG Weijian . Effects of Green Manure Planting and Lime Application on Cadmium Content in Double-cropping Rice Under Controlled Irrigation[J]. Chinese Journal OF Rice Science, 2024 , 38(2) : 211 -222 . DOI: 10.16819/j.1001-7216.2024.231005
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