Considered as a potato manure, soot is relatively 

 deficient in phosphates and potash, and on some 

 soils this deficiency would show up in the crops when 

 compared with a complete manure. 



KlLN DUST. The sample of kiln dust contains : 



Moisture 10-30 



Organic Matter ... 79 '95 containing Nitrogen 3 '98 

 Mineral Matter ... 9'75 Phosphoric Acid 0'93, 



and Potash, 1 '80. 



100-00 



The same remarks apply to this as to the soot. 

 The kiln dust, however, contains less nitrogen, and 

 this in a less active form. 



GUANO. The sample of guano contains : 



Moisture and Volatile Matter ... 43 "25 containing Nitrogen, 



5-24 

 Mineral Matter ... 56 75 



100-00 



Earthy or Insoluble Phosphates 26 '70 or Phosphoric Acid 12*23 



Soluble Phosphates none 



Potash 1-15 



Magnesia 4'70 



On most soils it would be well to add potash salts 

 to the guano for potatoes. 



" POTATO MANURE." The sample contained : 



Moisture 14-16 



Sulphate of Ammonia ... 1T54 containing Ammonia 2 '97, 



Nitrogen 2 '4 



Phosphate rendered soluble . 17 '68 or Phosphoric Acid 8'10. 

 Potash 2-70 



Such a manure would be obtained by mixing one 

 part of sulphate of ammonia with seven parts of 



