Effect of organic fertilisers on the zinc and cadmium uptake of soybeans and wheat on an artificially contaminated soil

摘要

The objectives of the research reported here was to investigate the effect of organic fertilisers on the Zn and Cd uptake by plants from poluted soils. Soybean and wheat were grown in a greenhouse experiment on soils contaminated with 300 and 3 mg kg(-1)Zn or Cd respectively. 10 g kg(-1) dry matter of soybean straw, alfalfa green meal and farmyard manure (1, 4 and 2 % N respecively) were added. The addition of Zn and Cd as nitrates increased their concentrations in both crops, in all growing stages and in all plant parts, but the effect of the organic fertilisers on the Zn and Cd content and uptake were distinctive different. This differences in the effect of the organic fertilisers were attributed to the synergistic effect of nitrogen on the uptake of Zn and Cd.