418 MANUAL OF TROPICAL AND SUBTROPICAL FRUITS 



protein 5.44, total sugars 1.87, fat 0.24, fiber 1.80, and hydroly- 

 zable carbohydrates other than sucrose 23.53. Thus it will be 

 seen that the pulp is rather high in protein and fiber and low 

 in acids. The seeds have a high starch-content and very little 

 sugar, while the protein-content is about 5 per cent. 



The climatic requirements of the jackfruit consist in abun- 

 dant precipitation and freedom from severe frosts. Probably 

 it can be grown by the aid of irrigation in regions where there is 

 little rainfall. Mature trees have passed through temperatures 

 of about 27 above zero in southern Florida, but they were 

 frozen to the large limbs. Though temperatures below freezing 

 kill young trees and injure old ones, the jackfruit is not, like 

 its congener the breadfruit, injured by cool weather several 

 degrees above freezing. It prefers a rich, deep, and moist soil, 

 but can be grown successfully on shallow and light soils such 

 as some of those of southern Florida. In Brazil it grows well 

 on clay and on sandy loam. Very little attention is given to 

 cultural methods in the regions where the jackfruit is commonly 

 grown. Like the breadfruit, it succeeds without much care from 

 man, the sole necessity being abundant moisture. 



Propagation is by seeds, which should be planted soon after 

 their removal from the fruit. The method of propagation by 

 means of root-cuttings or suckers, which is practiced with the 

 seedless breadfruit, is said not to be successful with this species. 



According to Paul Hubert, young trees come into bearing 

 when five years of age. It is doubtful, however, whether they 

 can be depended on to fruit so early. Thomas Firminger 

 writes : "The jackfruit is not borne, like most other fruits are, 

 from the ends of branches, but upon stout footstalks pro- 

 jecting from the main trunk and thickest branches of the tree. 

 In no other way, indeed, could its ponderous weight be sus- 

 tained. The situation of the fruit, moreover, is said to vary 

 with the age of the tree; being first borne on the branches, 

 then on the trunk, and in old trees on the roots. Those borne 



