1899.] 



l'lT.LIC DOCUMENT — No. 33. 



125 



potassium oxide applied was the same in each case, while 

 the amount of total phosphoric acid applied in ease of the 

 phosphatic slag meal was one-fourth more than in the case 

 of the dissolved bone-black, which is practically all soluble 

 in water. 



Composition of the Manurial Substance used, with Reference to 

 Potash, Phosphoric Acid and Nitrogen {Per Cent.). 



Potassium 

 Oxide. 



Phosphoric 

 Acid. 



Nitrogen. 



Sulphate of potash, .... 



Dissolved hone-black 



Phosphatic slag meal,* 



Dried blood, 



Philadelphia tankage (steamed leather), 

 Ground leather waste, .... 



14.00 

 18.40 

 4.00 



10.00 

 7.80 

 7.02 



* Calcium oxide, 48.6 per cent. 



They grew at a similar rate during spring until the latter 

 part of April, when those which had received dried blood as 

 nitrogen source (boxes 1 and 2) became more stalky, de- 

 veloping more and broader leaves than the plants in boxes 

 3, 4, 5 and 6. This difference in their growth became more 

 marked as the season advanced. 



The following statement gives the average height of the 

 plants at various stages of observation (inches) : — 



The plants in all boxes began blooming about the same 

 time, the first week of June ; they were harvested the first 

 week of July. There was no marked difference in regard 



