EXPERIMENTAL STUDY ON THE ACCUMULATION OF HEAVY METALS IN DIFFERENT PARTS OF FORAGE UNDER HEAVY METAL POLLUTION ENVIRONMENT.

The use of agricultural fertilizers can cause serious pollution of heavy metals in the soil. In addition, it can also lead to unsafe factors such as heavy metal residues in the forage feed produced, which affects the health of livestock in the animal husbandry industry, and ultimately affects human health. Re search on the accumulation of heavy metals in different parts of forage under heavy metal pollution is very important to the safety and environmental protection of forage feed. In order to solve this problem, in this paper, we systematically studied the accumulation characteristics of heavy metals in forages in soils with different concentrations of heavy metal cadmium, and proposed a calculation formula for the content of heavy metals in forages. Through experiments, the average concentration of metal cadmium accumulation in the whole forage in different experimental fields was obtained. The measurement results found that the cumulative cadmium concentration of the three forages in experimental field 1 (seil cadmium concentration of 1.68 mg/kg), was lower than 1.0 mg/kg, which was a low concentration. The results of the accumulation of heavy metal cadmium in different parts of the stems and leaf roots of the three forage grasses showed that the cadmium con centration in the stems and leaf roots of bonnet, sweet Borghum and hybrid elephant grass showed a trend of first increasing and then decreasing with the increase of soil cadmium content. In addition, the cadmium concentration in the leaves of the forage grass is the least accumulated, followed by the roots and stems. A comprehensive comparison of the cadmium accumulation of the three commonly used for ages found that the cadmium accumulation concentration of the stems, leaves and roots of bonbon is far: lower than that of sweet sorghum and hybrid elephant grass, so its safety index is the highest. [ABSTRACT FROM AUTHOR]