ORANGES IN WESTERN ANDALUSIA. 



575 



are given as the quantity of such constituents usually contained in 

 30,000 kilograms of what may be called stable manure of the normal 

 type : 



Kilograms. 



Potash 121 



Soda 8 



Lime 144 



Magnesia 60 



Phosphoric acid 51 



Sulphuric acid 30 



Siliceous acid ir>0 



Oxide of iron 102 



Hydrochloric acid y 



Total 675 



The general composition of these 30,000 kilograms of stable manure 

 may be summed up thus : 



Kilograms. 



Mineral constituents 675 



Nitrogen 120 



Carbon, hydrogen, and oxygen ..., . 5.205 



Moisture .* 24,000 



30,000 



Suppose 30,000 kilograms of such manure to have been applied to one 

 hectare of ground from which a crop of 16,000 kilograms of fruit has 

 been raised, let us see what mineral constituents have been replaced 

 and what proportion is still wanting. 



The deficiency of lime may be left out of consideration here, as there 

 is generally a very large amount of this constituent stored up in the soil ; 

 there remains, therefore, to be dealt with the deficiency of soda and of 

 phosphoric acid. The first may be met by the addition of common sea- 

 salt to the extent of 300 kilograms. The 63 to 64 kilograms of phos- 

 phoric acid may be supplied by adding either 1,000 kilograms of fowl 

 manure, 400 kilograms of guano, or 300 kilograms of ground bones. 



The nitrogen withdrawn by a crop of 16,000 kilograms weighs 136 

 kilograms ; supplied in 30,000 kilograms of manure, 120 kilograms- 

 showing a deficiency of 16 kilograms, for the supply of which may be 

 added either ordinary stable manure, 4,000 kilograms ; fenta desecada 



