Study on the Application Effect of Leaf Surface Conditioner in Rice Fields with Different Cadmium Pollution Levels

doi:10.11924/j.issn.1000-6850.casb2023-0240

Abstract

Abstract:

The aims is to explore the effects of three leaf surface conditioners on the total cadmium content, available cadmium content, and soil pH in paddy soil with different levels of cadmium pollution, and on cadmium content in rice, cadmium content in various tissues of rice, and yield. Three leaf conditioners, silicon potassium medium element fertilizer, Bihu Nutritional Package, and Jiangcadulin, were selected to conduct field cadmium control experiments in paddy fields contaminated with heavy metal cadmium in Jinjing Town, Huanghua Town, Chating Town, and Wangcheng District of Changsha County. The results showed that spraying foliar conditioner significantly improved rice yield. Leaf surface conditioners had no significant effect on the total cadmium content in soil, but could significantly reduce the available cadmium content in soil. Leaf surface conditioners can slightly increase soil pH, but their performance varies greatly in different regions. Leaf surface conditioners can reduce the cadmium content of brown rice, but in moderately polluted rice fields, they cannot reduce the cadmium content of brown rice to national standards(≤0.2 mg/kg). Applying Bihu Nutritional Package can increase rice yield, increase soil pH, reduce available cadmium content in soil, and reduce cadmium content in brown rice. It is recommended to further demonstrate and promote this method in lightly and moderately polluted paddy fields.

Key words: foliar conditioner, cadmium pollution, paddy, rice

LI Cheng, WANG Shaoxi, QIAN Yanjie, YI Zhanping, YAN Xiaobing. Study on the Application Effect of Leaf Surface Conditioner in Rice Fields with Different Cadmium Pollution Levels[J]. Chinese Agricultural Science Bulletin, 2024, 40(6): 101-106.

Figures/Tables 6

References 33

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代号	地点	pH	总Cd/(mg/kg)	有效态Cd/(mg/kg)	有机质/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
A	长沙县金井镇	6.1	0.28	0.12	32.05	16.8	102
B	长沙县黄花镇	5.7	0.44	0.21	33.18	10.8	195
C	望城区茶亭镇	5.1	0.89	0.41	32.34	21.5	214

代号	地点	pH	总Cd/(mg/kg)	有效态Cd/(mg/kg)	有机质/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
A	长沙县金井镇	6.1	0.28	0.12	32.05	16.8	102
B	长沙县黄花镇	5.7	0.44	0.21	33.18	10.8	195
C	望城区茶亭镇	5.1	0.89	0.41	32.34	21.5	214

名称	主要成分
硅钾中量元素肥料	硅(Si)≥100 g/L，氧化钾(K₂O)≥120 g/L
碧护营养套餐（融地美+碧护+安融乐）	融地美：硅(Si)≥100 g/L；碧护：0.136%赤·吲乙·芸苔可湿性粉剂；安融乐：3%卵磷脂·维生素E
降镉灵	硅(Si)≥85 g/L，水不溶物≤10 g/L，钠(Na)≤10 g/L

名称	主要成分
硅钾中量元素肥料	硅(Si)≥100 g/L，氧化钾(K₂O)≥120 g/L
碧护营养套餐（融地美+碧护+安融乐）	融地美：硅(Si)≥100 g/L；碧护：0.136%赤·吲乙·芸苔可湿性粉剂；安融乐：3%卵磷脂·维生素E
降镉灵	硅(Si)≥85 g/L，水不溶物≤10 g/L，钠(Na)≤10 g/L

试验点	处理	水稻产量/(kg/hm²)	比CK增产/%
A	CK	7108.4c	—
	硅钾中量元素肥料	7634.1b	7.4
	碧护营养套餐	7829.5a	10.1
	降镉灵	7513.2b	5.7
B	CK	6843.2c	—
	硅钾中量元素肥料	7284.6b	6.4
	碧护营养套餐	7514.3a	9.8
	降镉灵	7245.7b	5.8
C	CK	6654.3c	—
	硅钾中量元素肥料	7071.2b	6.2
	碧护营养套餐	7316.5a	10.0
	降镉灵	7015.9b	5.4