PHYSICAL FEATURES 11 



fertility. The soils of Kyagwe and Busoga are 

 neutral in acidity, whilst that of Buddu is slightly 

 acid. This is to be expected owing to its paucity 

 of lime. 



The chief elements of fertility, iron, lime, 

 magnesia, potash, phosphoric acid and nitrogen 

 are present in sufficient quantities, except in the 

 case of Buddu soil, where lime and magnesia are 

 deficient. In the case of Busoga soil the propor- 

 tion of magnesia is excessive, while that of lime 

 is less than might be desired. 



Both Busoga and Buddu soils, therefore, would 

 be materially improved by the addition of lime. 

 The soil of Busoga is particularly rich in nitrogen. 

 More important, however, than the amount of the 

 elements present in a soil is the condition in which 

 they occur and the quantities immediately avail- 

 able as plant food. Mr. Kaye's Report is specific 

 on these points. His figures have been obtained 

 by treating the minerals with a certain solu- 

 tion of citric acid. The quantity of a mineral 

 which becomes soluble in this solution is considered 

 to be the quantity which is in such a condition as 

 to be readily soluble in the sap of the root-cells of 

 the plant, and therefore immediately available as 

 plant food. 



