Variability in the concentration of mineral elements and phytochemical contents of cowpea genotypes for crop improvement. - Mbuma, Ntombokulunga W.; Gerrano, Abe Shegro; Lebaka, Ntjapa; Amoo, Stephen; Mofokeng, Alina; Labuschagne, Maryke (Acta Agriculturae Scandinavica: Section B, Soil & Plant Science, 2021)