SOILS AND MANURES 373 



use of the salt, and this to some extent would apply to chloride chap. 

 of potassium also. He refers to the fact that in England VIIL 

 it has been proved in many cases that potassium in the 

 form of chloride (i.e. " muriate of potash ") applied to potatoes 

 is not so beneficial as when the potassium is applied in the 

 form of sulphate, and in fact has caused deterioration in the 

 quality of the crop, while kainit has given the best results. 



Addendum. — The writer is informed that in Rhodesia the 

 "chocolate" soils prove best suited to maize, and produce 

 heavy crops year after year without the application of manure. 

 The "red" soils produce maize for about three years in suc- 

 cession, and then require a rest. The granite soils, though 

 producing good tobacco, are found unsuited to maize-growing. 



