1899.] 



PUBLIC DOCUMENT — No. 33. 



125 



potassium oxide applied was the same in each case, while 

 the amount of total phosphoric acid applied in case 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 Mamirial Substance tised, ivith Reference to 

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



Potaesium 

 Oxide. 



Phosphoric 

 Acid. 



Nitrogen. 



Sulphate of potash, .... 



Dissolved bone-black 



Phosphatic slag meal,* 



Dried blood 



Philadelphia tankage (Btcamed 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- 

 veloi)ing 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 tirst 

 week of July. There was no marked difference in regard 



