Augustine BB, Godfre W. Effect of different phosphorus levels on four cowpea (Vigna unguiculata Walp L.) varieties for grain and fodder yield in Upper East Region of Ghana. Arch. Agric. Environ. Sci. [Internet]. 2019Jun.10 [cited 2024Nov.21];4(2):242-8. Available from: https://journals.aesacademy.org/index.php/aaes/article/view/aaes-04-02-018