152 AGRICULTURE 



will work out at 10, 4s. 7d. Or, employ- 

 ing the system of units, we can multiply 

 56*85 by 3s. 7d., when, of course, we come 

 to the same result. If, therefore, considera- 

 tions of carriage and cartage are serious, 

 one would be disposed to select this form 

 of manure rather than the less concentrated 

 forms previously mentioned. Many experi- 

 ments have been carried out with the view 

 of determining whether potash is best 

 employed in the form of sulphate or of 

 chloride, but it cannot be said that crops 

 display any very special preferences for the 

 one as compared with the other. What 

 should therefore determine a purchase would 

 be considerations of carriage and cartage, 

 and, more particularly, the price per unit 

 at which the various manures are offered. 



As regards the crops to which potash may 

 with advantage be applied, it may be said 

 that it is only under very exceptional cir- 

 cumstances that cereals need a potassic 

 dressing. When barley is grown upon very 

 light land a considerable increase is sometimes 

 got from the use of potash, but in the case of 

 wheat and oats a potassic dressing is practi- 

 cally never required. It is for roots, potatoes, 

 and leguminous crops that considerations of 

 potash are most important. In the case of 





