23 



TABLA VII. 



Note 



On examiation of the general condition of the cane and of the 

 amount of infestation by diseases and insects, Mr. Johnston reported the 

 following facts: 



No. 1. Very small amount of root disease and very few insects. No 

 root grubs. A good root system developed, but many of the roots dead. 



No. 2. Good deal of root fungus. Roots well developed. Root hairs 

 in pretty good shape. Cane about fair. 



No. 3. Much root fungus. Root system only fair, root hairs in poor 

 condition; many dead and dry shoots, probably due to soil conditions. 



No. 4. Worse than No. 3. Great deal of root disease. Well developed 

 root system, but many dead roots. Root hairs scarce. 



No. 5. Some root disease. Root system fairly good, plenty of root 

 hairs. 



No. 6. Very small amount of root disease. Very good root system 

 and root hairs. 



No. 7. No signs of root disease. Roots and root hairs in excellent 

 condition. 



No. 8. Some root fungus. But roots well developed and root hairs 

 in good condition. 



The condition of the root system is considered of more importance 

 than the presence or absence of root fungi or insects. The abundance of 

 root hairs in good condition determines the ability of the plant to 

 assimilate sufficient water for its needs. 



The other samples mentioned on page 21, and taken by the writer, 

 comprised the following : 



No. 9. In Colonia A, field No. 1; about 12000 meters from the 

 central factory; the soils from this place are typical marsh soils and 

 their agricultural analyses have been given in the preceding chapter. 

 The first of the 3 samples represents the surface stratum, about four 

 inches thick, and consists of a mixture of the black vegetable mould and 



