Suitable Soil
It was for many years believed that if a tree were analysed the best soil for its growth could at once be inferred and described, as it was assumed that the best soil would be one containing the same elements in similar proportions. This simple theory ignored the characteristic powers of assimilation of the tree in question and the “digestibility” of the soil constituents. However, it is agreed that soils rich in potash and lime (e.g., those obtained by the decomposition of certain volcanic rocks) are good for cacao. An open sandy or loamy alluvial soil is considered ideal. The physical condition of the soil is equally important: heavy clays or water-logged soils are bad. The depth of soil required depends on its nature. A stiff soil discourages the growth of the “tap” root, which in good porous soils is generally seven or eight feet long.