Effect of Silicon on Growth, Biochemical Constituents, and Mineral Nutrition of Cowpea

The effect of different concentrations (50, 100, 200, 400, and 800mgkg-1) of silicon (Si) added to the soil was studied on growth performance, biochemical constituents, and nutritional status of cowpea [Vigna unguiculata (L.) Walp.]. Lower applications of Si resulted in an enhancement in relative yield, leaf area, chlorophyll, and iron (Fe) contents and a reduction in proline contents. A significant (P = 0.01) direct relationship between relative yield and lower applied Si concentrations was observed. A significant dependence of tissue Si concentration on soil Si concentration was observed. The results indicate a beneficial effect of Si on cowpea plants.