CH. ix] Prices 1 63 



At Garforth the potash has usually given no return; 

 at Horton, however, distinct increases have been 

 obtained. 



In glasshouse practice sulphate of potash is generally 

 considered better than kainit. 



The muriate and sulphate are single potassium salts 

 but kainit is not: it is a mixture blended to constant 

 potash content containing sodium and magnesium salts 

 as well which have distinct fertilising value although 

 they are not as effective as potash. Dressings of potash 

 and particularly of kainit have occasionally reduced the 

 crops, apparently because interaction with the calcium 

 carbonate in the soil gives rise to potassium carbonate 

 which has a bad effect on the soil texture^. 



The composition and prices of the three manures were 

 before the war: 



Containing 



potassium 



equivalent to 



Sulphate of potash 48-5 % of K2O 



Muriate of potash 45 -, 



Kainit 12-5 



During the war sulphate of potash rose to 50 per ton 

 at which price it could hardly be profitable except for 

 potatoes and flax, and in special cases for other crops on 

 light soils. 



Flue dust, however, was obtainable at much cheaper 

 rates : 



