Effects of soil Amendments on Spinach Growth and Cadmium Accumulation in Strongly Acidic Soil
In order to obtain well-performed soil amendment for remediating farmland soils polluted by strongly acidic cadmium(Cd),spinach was used as test plant in this research,and the effects of four soil a-mendments including zeolite,calcium-silicon based conditioner,commercial organic fertilizer and humic acid on soil pH and growth and Cd accumulation of spinach in strongly acidic soil were studied by pot experiment.The results showed that applying the four soil amendments all increased soil pH value(0.72～2.04 units),de-creased DTPA-Cd content in soil(14.5%～42.2%)and reduced Cd accumulation(4.8%～83.6%)in spin-ach.Compared with the control,the application of 30 g/kg calcium-silicon based amendment and humic acid significantly reduced plant Cd concentration by 83.6%and 61.5%,and reduced bioconcentration factor by 79.9%and 60.1%,respectively.Besides,the application of the four soil amendments all effectively improved soil acidity,reduced soil exchangeable Al3+content,and promoted spinach growth.The fresh and dry weights of spinach plant increased by 73%～1 230%and 71%～1 059%,respectively,compared with the control.The effects of different soil amendments on growth promoting showed as calcium-silicon based conditioner>humic acid>zeolite>commercial organic fertilizer.The reduction of soil available Cd and exchangeable Al3+contents was a key measure to increase spinach biomass.In summary,the calcium-silicon based amendment had greater advantages on improving highly acidic soil productivity and enhancing remediation of Cd polluted farmland.
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