MANURES AND MANURING. 



45 



ters of a ton less than that produced by the application of 

 20 tons farmyard manure; and third, that on each of the 

 plots 4, 5, and 6, the addition of artificial manures to the 

 lighter dressing of dung has yielded a larger crop than the 

 heavier dressing of dung yielded. 



" It may be urged, and justly so, that it is a mistake 

 to charge the potato crop with the full value of the farm- 

 yard manure. But whether the full value, or only haJl 

 of the value, of the farmyard manure is charged to the 

 potato crop, the result is the same, viz., the use of arti- 

 ficial manures along with 15 tons farmyard manure has 

 in each case left a greater profit per acre than the use of 

 20 tons farmyard manure alone. These experiments, there- 

 fore, seem to justify the conclusion that, as a general 

 rule, and particularly where farmyard manure is limited 

 in amount, farmers would be well advised to apply the 

 latter in more moderate quantities, and to supplement it 

 with suitable artificial manures. 



' That leads to the further question arising out of the 

 experiments : What artificial manures should be used in 

 supplementing a moderate dressing of farmyard manure? 

 An answer is furnished from the figures contained in the 

 following table : 



