PRINCIPLES OF MANURING 117 



comparatively small amount of lime was 

 added to soil that had been brought into this 

 condition, fertility was immediately restored 

 and satisfactory yields were obtained. Sul- 

 phate of ammonia, therefore, would appear 

 to be specially adapted for use upon chalky 

 soils, and others derived from rocks contain- 

 ing a high percentage of lime. 



Climate also is not without influence in 

 determining the special suitability of one or 

 other of these two manures. On account of 

 the ease with which rain water removes 

 nitrate of soda from soil, one should rather 

 hesitate to use it in a district of high rain- 

 fall, or, at all events, other things being equal, 

 preference would be given to the other 

 manure. Conversely, nitrate of soda would 

 appear to have an advantage over sulphate 

 of ammonia in the drier districts of the East 

 and South of England, and especially if the 

 soil is heavy. 



But after giving full consideration to these 

 various questions, a farmer may still be in 

 doubt as to which manure to employ, and 

 in the end his choice will probably be deter- 

 mined by considerations of cost. When the 

 two manurial substances under consideration 

 are of standard quality, sulphate of ammonia, 

 as compared with nitrate of soda, contains 



