Investigation on bioaccumulation of heavy metals like lead, cadmium and mercury by pigeonpea an important pulse crop of India, were undertaken. The experiments were performed to evaluate the extend of accumulation of these metals in the aerial parts of the plant.

A study was carried out on toxic effects of cadmium nitrate on chlorophyll content of soybean and pigeon pea for two crop seasons. The concentration studied were 0.01M, 0.001M and 0.0001M. Chlorophyll content markedly decreased in all the treated plants and the decline was directly related to the concentration.