FARM CROPS 39 



nitrate of soda. These manures are not to be 

 applied at the same time ; the slag, which is to 

 be preferred to the super on the sourer and 

 more clayey soils, should be applied in January, 

 the kainit in autumn, the super in early spring, 

 and the nitrate of soda not till growth com- 

 mences. 



