On the Itlanarlal KfFtect of Calcium Cyananiide. {O? 



IV. General Conclusion. 



i). The nianurial effect of lime-nitrogen varies greatly with the reaction of 

 the other manuring compounds : it acts best when the total reaction in 

 the soil approaches neutrality. 



2). The manurial effect of ammonium sulphate varies also greatly with 

 the reaction of the other manuring compounds : it acts better when 

 sodium phosphate than when superphosphate is applied along with it. 

 Also from this fact, it must be inferred that ammonium sulphate acts 

 best when the reaction of the total manure approaches neutrality. 



3). The manurial effect of lime-nitrogen is under favorable conditions 

 equal (see barley experiment) to that of ammonium sulphate ; but 

 when the nitrogenous manures are compared in small applications, 

 ammonium sulphate proved superior. This result may be due to the 

 changed state of the reaction. 



4). On sandy soil, the action of lime-nitrogen was farther below that of 

 ammonium sulphate than on loamy soil. 



