144 



Food foi; Pj^ants. 



well doiio, a fanner may reasonably expect the following 

 increases from a top-dressing of 1 cwt. of Nitrate of 

 Soda : 



Wlieat, irrain 

 Wheat, straw 

 Barley, grain 

 Barley, straw 

 Oats, grain . . 

 Oats, straw . . 



TTay 



Mangolds .. . , 



Swedes 



Potatoes 



Per 1 cwt. nitrate 

 of soda. 



41/9 bushels 



5 cwt 



61/9 bushels 

 C)Vi cwt. . . . 



7 bushels . . 

 () cwt 



8 to 10 cwt.. 



32 cwt 



20 cwt 



20 CAvt 



Per 1 cwt. superphos- 

 phate or high grade 

 basic slag, 



to 114 bushels. 

 1/2 to 5 cwt. 

 2 to 3 bushels. 



to 2 cwt. 



1 to 'MA bushels. 

 to 2 c"wt. 



20 cut. 



20 to 40 cwt. 



10 cwt. 



For pnr|)oses of comparison the effect of phosphates 

 is shoA^ai also. 



Officiftl Abstract of a Paper read bji Professor E. B. Voorhees before 

 The International Congress of Applied Chemistry held in London, 

 June, 1909. 



INVESTIGATIONS RELATIVE TO THE USE OF 

 NITROGENOUS FERTILIZER MATERIALS, 1898- 

 1907. 



By Edward B. Voorhees, Sc. D. {Director) and Jacob G. Lipman, 

 Ph. D.- {Soil Chemist and Bacteriologist), Agricultural Experiment 

 Station, Netv Jersey, U. S. A. 



Ten years ago denitrification was believed to possess 

 an economic significance. A considerable number of 

 agricultural chemists thought that the destruction of 

 nitrate by denitrifying bacteria involved losses of nitro- 

 gen in all cases where nitrates and animal manures were 

 used together. The experiments recorded here w^ere 

 planned, primarily, to determine ^vhether such losses of 

 nitrogen really occur in field practice. The data collected 

 in the course of ten years su])ply some definite informa- 

 tion in this connection; and furnish, moreover, much 

 im]K)i-tant information bearing on other ])hases of the 

 jiitrogen question. 



