The experiment was conducted in the autumn of 2019 to see how three cowpea (Vigna ungiculata (L.) Walp) varieties responded to humic acid concentrations and addation methods on growth and yield. (Ramshorn, TSD, and Biader) varieties of cowpea were used. Humic acid at concentrations of 0, 2, and 4 mL liter-1 was applied through foliar spray and ground irrigation. With three replicates, the experiment was set up in a divided plot configuration. At the 0.05 level of likelihood, mean values were compared using L.S.D. In response to different concentrations of humic acid, the varieties vary greatly in growth parameters such as plant height and lateral branchees, as well as yield parameters such as green pods and soft seeds. For both addation processes, the highest concentration of humic acid was 4 mL liter-1 in all varieties. The application of ground irrigation was superior to foliar spray application. When it came to humic acid concentrations and applications, the Bayader variety performed better.
Please see the link :- https://www.ikprress.org/index.php/PCBMB/article/view/5549
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