I find that if to 83 parts of the soil I added 1 part of bonedust, 12 parts of castor cake, 2 parts of potash salt, and 2 parts of lime, I should make up a compost equal to good English farmyard manure, and at but a slightly increased cost, which would be more than covered by the special physical and other advantages arising from the use of kemmannu.
For instance, the growers of Areca nut palms, and pepper vines, make a mixture of Kemmannu, or red, or rather pink hued soil, which looks like recently-decomposed rock, black earth, and sheep dung, and apply the compost to their palms and pepper-vines, and it would be interesting to try such composts in the case of coffee.
I may add that I have since made a calculation with the object of seeing how, by the addition of manures to the kemmannu soil, I could make a mixture which would have all the fertilizing ingredients of farmyard manure in addition to the advantages possessed by the soil, and which I have just enumerated.