MANURES, 307 



soluble and diffusible compound, is apt through double 

 decomposition to form objectionable salts in the soil, such 

 as calcium chloride. 



Potash manures pay best on light sandy or calcareous 

 soil and the crops to which they are applied with greatest 

 advantage are potatoes and the leguminous crops. 



Being a plant food which is well "fixed" in soil through 

 'nteraction with certain silicates, etc. there is little fear of 

 loss of potash through drainage. Potash manures there- 

 fore do not in their application demand the careful hand- 

 ling necessary in dealing with the soluble nitrogenous 

 manures. 



As regards the quantity to be employed, this among 

 other things will depend on the kind of manure used 

 and varies from one hundred and fifty to two hundred 

 and fifty kilogs. in the case of the poorer salt, kainit, 

 to from fifty to eighty kilogs. per feddan in the case of 

 the stronger manures. 



During 1906 only some fifty tons of sulphate of potash 

 were imported into Egypt at a cost of 950 P.T. per ton. 



