The Purchase oe Artificial Manures. 



rate it may be used to some extent as an ingredient of a 

 mixture. 



Nitrogenous manures cannot be profitably employed on 

 leguminous crops (peas, beans, clover, etc.), and on a mixed 

 crop of, say, clover and grass, if the clover is to be preserved 

 against suppression, they must be used sparingly, if at all. 

 They must also be used with caution on barley, and especially 

 so where a fine sample, rather than large yield, is looked for. 

 Other crops, however, generally respond freely to the use of 

 this class of manure. 



Nitrate of soda and sulphate of ammonia are apt to be 

 lumpy, therefore the buyer should look carefully to the 

 mechanical condition. Nothing should be applied that will 

 not pass a i-inch riddle. Lumps larger than this will often 



1 plants with which they may come into contact. 



Nitrate of soda is generally offered on the basis of 95 per 

 cent, of purity (equal to 15-6 per cent, nitrogen or 19 per cent, 

 ammonia), while commercial sulphate of ammonia usually 

 contains 97 percent, of the pure article (equal to 20*6 per cent, 

 nitrogen or 25 per cent, ammonia). Sulphate of ammonia is 

 thus the much more highly concentrated manure. 



Purely Phosphatic Manures. 



Of these superphosphate and basic slag are the most 

 important. The former is, speaking generally, more suitable 

 for use under the following circumstances ; — 



(a) Where rapid effect is wanted. 



(b) In spring. 



{c) For arable land. 



(d) For admixture with sulphate of ammonia. 

 Basic slag is specially suitable : — 



(a) For use in autumn. 



(b) For use on grass land. 



(c) For use on land holding much peat or other 



vegetable matter. 



(d) For use on land addicted to finger and toe. 



(e) For use in orchards. 



(/) For admixture with nitrate of soda. 



G G 2 



