Effects of ameliorants addition on Cd contents and yield of crop in Cd-rich reclaiming substrates

In this study, there were two substrates, one was fly ash plus vinasse substrate (substrate Ⅰ), and the other was fly ash plus sewage sludge substrate (substrate Ⅱ). The effects of using citric acid and white lime as ameliorants addition on the growth of kidney beans, cowpeas and potatoes planted on the two substrates were studied to choose the crops which could be securely planted. The results showed that white lime could significantly rise the emergence ratio, while citric acid had little effects on emergence ratio. The yield of kidney beans and cowpeas in substrateⅠ and potatoes in both substrates could be significantly increased by white lime; citric acid significantly decreased the yield of kidney beans and cowpeas in substrateⅠ, but had no significant effect on product of potatoes in both substrates. White lime could significantly decrease the content of Cd in both kidney beans and potatoes, while citric acid could significantly increase the content of Cd in kidney beans. Kidney beans, cowpeas and potatoes can be securely planted in fly ash plus vinasse substrate and only potatoes can be securely planted in fly ash plus sewage sludge substrate.