B. Halm

Twenty Years' Results from a Shade and Fertilizer Trial on Amazon Cocoa (Theobroma cacao) in Ghana

M. Appiah, Y. Ahenkorah, G. Akrofi, 1987, Experimental Agriculture.

Twenty Years' Results from a Shade and Fertilizer Trial on Amazon Cocoa (Theobroma cacao) in Ghana

É., M., Appiah, 1987, Experimental Agriculture.

Phosphatase activity of soil as affected by cocoa pod ash

M. Appiah, Y. Ahenkorah, B. Halm, 1985 .