Effects of Two Modifiers on Passivation of Cadmium in Calcareous Soil in Northern China and Growth of Pakchoi

doi:10.7668/hbnxb.20192453

Abstract

Abstract:

To investigate the effects of zeolite and Ca-Mg-based bentonite on the passivation of cadmium in calcareous soil in Northern China and the growth of pakchoi,a pot experiment was conducted to study the effects of two modifiers(mass fraction of zeolite was 0.5%,1.0%,2.0% and mass fraction of calcium-magnesium bentonite was 0.2%,0.3%,0.4%,0.5%,0.6%,0.8%)on pH value,available cadmium content of calcareous cadmium-contaminated soil in Northern China and cadmium content,dry matter accumulation and chlorophyll content of aboveground part of pakchoi.The results showed that compared with the control,adding different doses of zeolite could increase the soil pH value.With the increasing of zeolite application dose,the available cadmium content of soil,the aboveground cadmium content,the dry matter accumulation and chlorophyll content of pakchoi decreased gradually.The germination rate of pakchoi increased gradually,but the effects of zeolite treatments on the indexes determined in the experiment were not significant.The application of Ca-Mg-based bentonite significantly increased the soil pH value(0.70—1.07)and decreased the Cd content in the aboveground part of pakchoi(63.83%—93.62%).The aboveground dry matter accumulation(5.56%—29.22%)and chlorophyll content(5.42%—11.72%)of pakchoi increased,and the soil available cadmium content significantly decreased by a higher dose(≥0.4%).However,the germination rate of pakchoi decreased significantly and inhibited germination.The research showed that Ca-Mg-based bentonite was more suitable for the passivation of cadmium in calcareous soil in Northern China than zeolites.The content of available cadmium in calcareous soil and the content of cadmium in the aboveground part of pakchoi could reduce by applying Ca-Mg-based bentonite.However,the amount of application should be strictly controlled to avoid affecting the germination of pakchoi and reducing yield.The comprehensive analysis of quality and yield factors showed that the addition of 0.3% Ca-Mg-based bentonite could effectively reduce the aboveground cadmium content of pakchoi and increase the aboveground dry matter accumulation and chlorophyll content of pakchoi.

Key words: Pakchoi, Calcareous soil, Cadmium, Zeolite, Bentonite

MA Jie, SUN Xiangyang, SUO Linna, WANG Lei, SUN Na, XU Ning, LI Jia. Effects of Two Modifiers on Passivation of Cadmium in Calcareous Soil in Northern China and Growth of Pakchoi[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(2): 152-159. doi: 10.7668/hbnxb.20192453.

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Figures/Tables 5

Tab.1 Effects of different amount of modifiers on pH value of soil

改良剂材料 Soil modifier	处理 Treatment	土壤pH值 Soil pH value
沸石	F1	7.83±0.10d
Zeolite	F2	7.80±0.10d
	F3	7.87±0.08d
钙镁基膨润土	T1	8.43±0.06c
Ca-Mg-based	T2	8.60±0.10b
bentonite	T3	8.67±0.06ab
	T4	8.70±0.10ab
	T5	8.73±0.06ab
	T6	8.80±0.10a
	CK	7.73±0.10d

Fig.1 Effects of different amount of modifiers on soil available Cd content
Different letters in the same group indicated significant differences among treatments at 0.05 level.The same as Fig.2—4.

Fig.2 Effects of different amount of modifiers on germination rate of pakchoi

Fig.3 Effects of different amount of modifiers on aboveground dry matter accumulation and chlorophyll content of pakchoi

Fig.4 Effects of different amount of modifiers on aboveground Cd content of pakchoi

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