Response of tropical soils to manurin; Coffee: history and economic importance, economics species, ecological considerations, nutrition, effects of fertilizer applications; Cocoa: history and world production, economic species, growing conditions, nutrition, effects of fertilizers; Tea: history, economic species and their distribution, ecological considerations, nutrition, effects manuring, manuring in the various tea growing regions; Tobacco: history and economic importance, commercial types of tabaco, growing condition, physiological aspects of nutrition, effects of fertilizers, current manurial practices.
