Biochemical contents and yield parameters of cowpeavarieties (vigna unguiculata (l.) walp.) on the application of copper

High concentrations of metals exert a negative influence on the development of plants, their use of nutrient and metabolism. The heavy metals can cause a major ecological crisis since they are non-degradable and often accumulate in plant parts, biologically magnified through trophic levels and causes deleterious effects on plants and animals. The present investigation deals with the effect of copper on the biochemical and yield parameters of Cowpea (Vignaunguiculata (L.) Walp.) under field condition. Copper was treated with Copper sulphate (CuSO4. 5H2O) from two Cowpea varieties (CO 7 and CO 6) of various concentrations (0, 5, 10, 25, 50, 100, 150 and 200 mgl-1) were prepared and were used for biochemical and yield studies. It is evident from the results obtained that the increase in copper concentration affected all the biochemical and yield parameters such as chlorophylls, carotenoids, total sugar, protein, amino acids, seed output, shelling percentage 100 seed weight, pod yield and harvest index were observed.