1901.] PUBLIC DOCUMENT — No. 33. 99 



during this series of years have included spinach, lettuce, 

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

 l)ages, potatoes, tomatoes, s(]uaslies, turnips, sweet corn and 

 ccler}^ and each of these as a rule has been grown a number 

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

 ployed in these experiments. During the i)ast three years 

 stable manure has been applied in equal quantities to each 

 of the plots, while the chemical fertilizers have been 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 efiicien(;y of the dilierent materials used as 

 the source of nitrogen : — 



Nitrate of soda, 100.0 



Dried blood, 86.6 



Sulfate of ammonia, 83.6 



For the same period, and taking into account those crops 

 (tomatoes, garden beans and sweet corn) making nuich of 

 their growth after hot w-eather 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 been ap[)lied, and taking 

 into account the early 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, calibages, turnips, 

 squashes and celery), the relative standing is : — 



Nitrate of soda, 100.0 



Dried blood, 97.8 



Sulfate of ammonia, 91.9 



