blood. In no case is the recovery equal to two- 

 thirds of the Nitrogen applied; besides, there are wide 

 variations in the amount recovered in the different 



forms. 



In 1898, plant nutrition experiments were begun 

 at the New Jersey Station, one object of which was to 

 study the "relative availability" of these three forms 

 of Nitrogen, using a rotation of corn, oats, wheat and 

 timothy,— crops which, because of their long periods 



Food for 

 Plants 



4i 



Privet Hedge at Left and Vines Showing Result of One Year's 

 Use of Nitrate. New Jeisey. 



of growth would be likely to absorb relatively large 

 proportions of organic Nitrogen. The results of these 

 experiments for two rotations (10 years) show that the 

 recovery for Nitrogen as Nitrate was 02.09 parts per 

 hundred; for the Nitrogen as ammonia 43.20 parts per 

 hundred, and for organic (dried blood Nitrogen), 40 

 parts per hundred. These results agree almost exactly 

 with those obtained at Darmstadt. Figuring the above- 

 men lioned returns from Nitrate of Soda, since it shows 

 the highest recovery as 100, the relative availability of 



