Cu Ni As Cr对萝卜出苗的影响

利用盆栽试验研究Ｃｕ、Ｎｉ、Ａｓ、Ｃｒ４个元素不同浓度对萝卜出苗的影响．结果表明，土壤含Ｃｕ５０ｍｇ／ｋｇ以上时，随着含Ｃｕ量的增加，出苗数随之减少．在酸性土壤上发生Ｃｕ和Ｎｉ危害时，可用提高土壤ｐＨ至中性的办法来消除．在中性土壤上，含Ｎｉ５０ｍｇ／ｋｇ以上对萝卜出苗有害．Ｃｕ、Ｎｉ复合污染比单一元素污染的危害大，且毒性Ｎｉ＞Ｃｕ．土壤Ｃｒ、Ａｓ含量越大，对萝卜出苗的危害也越大，并且毒性Ｃｒ（６＋）＞Ｃｒ（３＋）．

Effect of Cu,Ni,As and Cr on Radish Emerging

The effect of Cu,Ni,As and Cr concentrations on radish emerging was studied.The results showed that when the level of Cu in soil was above 50 mg/kg, the rate of emergency decreased with the increase in Cu concentration. The poison of Cu and Ni in acid soils could be reduced by raising soil pH to 7. The posien when Cu and Ni coexisted was more severe than that of single Cu or Ni. Ni had a stronger poiso compared with Cu.The rate of emergency also decreased with the increase in Cr and As concentrations in soils, and the poison of Cr(6 ) was more severe than that of Cr(3 ).