Efficacy of organic amendment in soil to overcome the heavy metal stress for plant in soil
Last modified: 2015-11-20
Abstract
Rapid industrialization and urbanization processes has led to the incorporation of pollutants such as pesticides, petroleum products, acids and heavy metals in the natural resources like soil, water and air thus degrading not only the quality of the environment, but also affecting both plants and animals. Heavy metals are important environmental pollutants that cause toxic effects to plants; thus, lessening productivity and posing dangerous threats to the agro-ecosystems. They act as stress to plants and affect the plant physiology. Study was conducted to suppress the metal toxicity against Vigna mungo by adding farm yard manure (FYM) and press mud (PM) as an organic amendment in the soil. The experiment was conducted in the glass house. Surface sterilized seeds of V. mungo was grown in pots containing: different doses (0, 25, 50 and 75 ppm) of metal [Cu(II)] spiked sieved soil and different doses of organic matter (OM) viz., 1 % and 2 %. Results revealed that 80-90% of the toxicity effect of copper metal was controlled by FYM (1%, 2%). Moreover, at higher dose of FYM i.e., 2% significantly depicted better growth and yield of the plant as compared to other treatments of OM. While; about 50-70% of the copper toxicity was suppressed at each doses of PM (1%, 2%) in comparison with FYM. From this it emerged that organic matter (OM) amendments have great potential to control the metal pollution in soil. More investigation on the mechanisms by which OM acts on metal toxicity on plant growth is needed to make the use of FYM more predictable.