THE CULTIVATION OF COCOA 115 



" Siloewok Sawangan " in Java, for instance, the sweet 

 potato (Ipomaea batatas) is used as a soil-preserver 

 between cocoa and under the light shade of the " kapok " 

 (Eriodendron anfractuosum) (Fig. 40). The sweet 

 potato gives no room for weeds, and troublesome grasses 

 are in particular well kept down. The soil on this 

 plantation is very fertile, rather heavy and rich in 

 humus. 



FIG. 40. Sweet potato (Ipomaea batatas] used as a soil preserver for young 

 cocoa planted under "kapok" (Eriodendron anfractuosum}, with tannia for 

 temporary shade (Java). 



The "lamtoro" (Leucaena glauca) (Fig. 35), a few 

 species of indigo (Indigofera tinctoria and others), the 

 " rorako " (Ormocarpum sennoides) and the " roempoet 

 toeri " or pigeon pea ( Clitoria cajanifolia) also suit the 

 purpose perfectly well. 



In Surinam the pigeon pea ( Cajanus indicus) would 

 be suitable, but the dense shade, first of bananas, and 

 afterwards of the permanent shade trees, make the use 

 of leguminous inter-crops impossible. 



More paying, but not so useful as a soil preserver 

 and improver, is the cassava. This plant has already 



