1901.] PUBLIC DOCUMENT — No. 33. 99 



during this scries of years liave included spinach, lettuce, 

 onions, garden peas, table Ijects, early cabbages, late cab- 

 bages, potatoes, tomatoes, scjuashes, turnips, sweet corn and 

 celery, and each of these as a rule has been grown a number 

 of years. Up to 1898, chemical fertilizers alone Avere em- 

 ployed in these experiments. During the past three years 

 stable manure has been applied in equal quantities to each 

 of the plots, while the chemical fertilizers have l)ccn used 

 in the same amounts and applied to the same plots as at first. 

 Taking into account the period when chemical fertilizers only 

 were used, and the crops (spinach, lettuce, onions, table 

 beets, garden peas and early cabbages) whose period of 

 growth is the comparatively early part of the season, we 

 find the relative efiiciency of the dilFerent materials used as 

 the source of nitrogen : — 



Nitrate of soda, 100.0 



Dried blood, 8G . 6 



Sulfate of ammonia, . 83.6 



For the same period, and taking into account those crops 

 (tomatoes, garden l)eans and sweet corn) making nutch of 

 their growth after hot weather fairly sets in, we find the 

 relative standing as follows : — 



Nitrate of soda, 100.0 



Dried blood, 97.8 



Sulfate of ammonia, ....... 103.5 



For the period since manure has l)ecn applied, and lakin<>- 

 into account the earl}^ crops only (spinach, lettuce, table 

 beets, onions, garden peas and potatoes), the relative stand- 

 ing: is : — 



'& 



Nitrate of soda, 100.0 



Dried blood, 88.8 



Sulfate of ammonia, . . . . . . . 61.7 



For the same period, taking into account the aggregate 

 yield of all the late crops (tomatoes, cabbages, turnips, 

 squashes and celery), the relative standing is : — 



Nitrate of soda, 100.0 



Dried blood, 97.8 



Sulfate of ammonia, 9 1 . 9 



