Coffee Cultivation in General
Today the commercial growers of coffee on a large scale practise intensive cultivation methods, giving the same care to preparing their plantations and maintaining their trees as do other growers of grains and fruits. As in the more advanced methods of arboriculture, every effort is made to obtain the maximum production of quality coffee consistent with the smallest outlay of money and labor. Experimental stations in various parts of the world are constantly working to improve methods and products, and to develop types that will resist disease and adverse climatic conditions.
While cultivation methods in the different producing countries vary in detail of practise, the principles are unchanging. Where methods do differ, it is owing principally to local economic conditions, such as the supply and cost of labor, machinery, fertilizers, and similar essential factors.
Implements Used in Early Arabian Coffee Culture
1, Plow. 2 and 3, Mattocks. 4, Hatchet and sickle. Top, Seeder Implement
Soil. Rocky ground that pulverizes easily—and, if possible, of volcanic origin—is best for coffee; also, soil rich in decomposed mold. In Brazil the best soil is known as terra roxa, a topsoil of red clay three or four feet thick with a gravel subsoil.
Climate. The natural habitat of the coffee tree (all species) is tropical Africa, where the climate is hot and humid, and the soil rich and moist, yet sufficiently friable to furnish well drained seed beds. These conditions must be approximated when the tree is grown in other countries. Because the trees and fruit generally can not withstand frost, they are restricted to regions where the mean annual temperature is about 70° F., with an average minimum about 55°, and an average maximum of about 80°. Where grown in regions subject to more or less frost, as in the northernmost parts of Brazil's coffee-producing district, which lie almost within the south temperate zone, the coffee trees are sometimes frosted, as was the case in 1918, when about forty percent of the São Paulo crop and trees suffered.
Generally speaking, the most suitable climate for coffee is a temperate one within the tropics; however, it has been successfully cultivated between latitudes 28° north and 38° south.
Rainfall. Although able to grow satisfactorily only on well drained land, the coffee tree requires an abundance of water, about seventy inches of rainfall annually, and must have it supplied evenly throughout the year. Prolonged droughts are fatal; while, on the other hand, too great a supply of water tends to develop the wood of the tree at the expense of the flowers and fruit, especially in low-lying regions.