Toxicity threshold limits of cadmium for leafy vegetables raised on mollisol amended with varying levels of farmyard manure.

In greenhouse experiments, the toxicity threshold limits of cadmium (Cd) were evaluated for amaranthus, fenugreek and buckwheat grown in a mollisol fertilized with varying levels of farmyard manure (FYM). The soil treatments involved factorial combinations of three levels of FYM (0, 2.23 and 4.46 g kg -1 soil) and seven levels of Cd (0, 5, 10, 25, 50, 100 and 150 mg Cd kg-1 soil). Increasing levels of Cd in the mollisol decreased the dry matter yields. The toxicity threshold limits of Cd for 10% reduction in the relative yields in 0, 2.23 and 4.46 g FYM kg -1 soil were 7.3, 30.5 and 11.0 mg Cd kg -1 dry matter