Effects of Basic Application of Soil Amendment on Soil Cd Passivation and Rice Cd Accumulation

doi:10.11924/j.issn.1000-6850.casb2024-0297

Abstract

Abstract:

To study the effect of the application of soil amendment on the Cd availability in soil and the Cd content in brown rice, a continuous three-year field experiment was conducted in two different textures of Cd contaminated paddy soil in Xiaojia Town, Hengyang City, Hunan Province. The results indicated that: (1) continuous application of soil amendment (2250 kg/hm² and 3000 kg/hm²) for three years significantly increased the paddy soil pH in Jinxing Village and Niuling Village, and reduced the content of available Cd in soil by 14.1%-50.0% and 16.9%-49.4%, respectively; (2) continuous application of soil amendment for three years significantly increased the rice yield in Jinxing Village and Niuling Village, and reduced the Cd content in brown rice by 40.4%-62.9% and 40.0%-64.1%, respectively. Moreover, the Cd content in brown rice in both areas was 0.15-0.18 mg/kg under the treatment of applying 3000 kg/hm²amendment, lower than the National Standards for Food Safety (GB2762—2022); (3) the net income of farmers in both areas increased significantly by 1603-2912 and 2282-3408 yuan/hm², respectively, under the treatment of applying 3000 kg/hm²amendment. Therefore, the application of soil amendment was a remediation technology that can achieve safe production in mildly Cd contaminated paddy soil.

Key words: amendment, Cd contaminated soil, rice, soil remediation, economic benefit, food safety

YUAN Haiwei, JIANG Xinghua, TANG Shouyin, HU Lu, LUO Xufeng, ZENG Peng, GU Jiaofeng, ZHOU Hang. Effects of Basic Application of Soil Amendment on Soil Cd Passivation and Rice Cd Accumulation[J]. Chinese Agricultural Science Bulletin, 2024, 40(36): 102-109.

Figures/Tables 7

References 29

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试验大田	土壤质地	pH	CEC/ (cmol/kg)	有机质/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	总镉/ (mg/kg)	有效镉/ (mg/kg)
金星村	黄砂泥	5.02	9.45	30.70	76.70	11.80	50.0	0.54	0.21
牛岭村	河砂泥	5.62	14.02	45.60	128.80	24.60	69.0	0.73	0.27

试验大田	土壤质地	pH	CEC/ (cmol/kg)	有机质/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	总镉/ (mg/kg)	有效镉/ (mg/kg)
金星村	黄砂泥	5.02	9.45	30.70	76.70	11.80	50.0	0.54	0.21
牛岭村	河砂泥	5.62	14.02	45.60	128.80	24.60	69.0	0.73	0.27

大田试验点	处理	稻米产量收益			修复后净增收入
大田试验点	处理	2020年	2021年	2022年	2020年	2021年	2022年
金星村	JX-CK	16949	14309	19516	—	—	—
	2250 kg/hm²	18269	15774	20985	-2130	-1985	-1982
	3000 kg/hm²	23320	20262	26779	2021	1603	2912
牛岭村	NL-CK	17536	16510	21057	—	—	—
	2250 kg/hm²	18784	17903	22869	-2203	-2057	-1638
	3000 kg/hm²	24490	23142	28816	2604	2282	3408

大田试验点	处理	稻米产量收益			修复后净增收入
大田试验点	处理	2020年	2021年	2022年	2020年	2021年	2022年
金星村	JX-CK	16949	14309	19516	—	—	—
	2250 kg/hm²	18269	15774	20985	-2130	-1985	-1982
	3000 kg/hm²	23320	20262	26779	2021	1603	2912
牛岭村	NL-CK	17536	16510	21057	—	—	—
	2250 kg/hm²	18784	17903	22869	-2203	-2057	-1638
	3000 kg/hm²	24490	23142	28816	2604	2282	3408