砖红壤添加铜对作物生长和残留的影响

本文对广东湛江地区砖红壤性水稻土,进行铜(CuCl_2)的不同添加浓度对水稻和花生作物生长发育和残留影响的盆栽试验研究。结果表明,在玄武岩成土母质发育的较高铜背景土壤上(46.5mg/kg),添加金属铜浓度在200mg/kg范围内,无论对水稻或花生,仍未出现对产量的不良影响,反而有一定的促进作用。从作物食用部分的残留量与土壤浓度的相关性来看,花生显著,而水稻不明显。最后建议277mg/kg土壤铜浓度作为砖红壤性水稻土的临界浓度。

Effect or Adding Copper in Lateritic Soil on Crop Growth and Its Residue.

The effects of different amounts of copper adding to the lateritic paddy soil in Zhangjiang area of Guangdong Province on the growth and residue of rice and peanut are studied by pot experiment. The result indicates that the soil developed from basalt containing less than 200ppm Cu has beneficial rather than harmful effect on the growth of rice and peanut. The correlation between the concentration of added copper and its residue is significant in peanut, but not in rice. It is suggested that the critical concentration of copper in lateritic paddy soil is 277ppm.