once available during the growing and fruiting season, 

 possessing, therefore, a decided advantage over all other 

 Nitrogen plant-foods. 



The following list of materials used as a source of Nitro- 

 gen, in making commercial fertilizers, shows the percentage 

 of Nitrogen in each: 



Per cent. Nitrogen. 



Nitrate of Soda 15 to 16 



Sulphate of ammonia 19 to 22 



Dried blood 10 to 14 



Tankage 5 to 12 



Dried fish scrap 9 to 11 



Cotton-seed meal 6 to 7 



Castor pomace 5 to 6 



Tobacco stems 2 to 3 



Bone meal 2 to 4 



Peruvian guano 6 to 10 



Nitrate of potash 13 to 14 



Manures 0.3 to 1.6 



The following table shows the number of pounds of 

 Nitrogen removed in one year from one acre by the crop 

 specified: 



Crop. 



Wheat 35 bushels. 



Rye 30 bushels. 



Barley 40 bushels. 



Oats 60 bushels. 



Corn 50 bushels. 



Buckwheat 30 bushels. 



Potatoes 200 bushels. 



Sugar beets 15^ tons. 



Mangel-wurzel 22 tons. 



Meadow hay 2^ tons, dry. 83 



Timothy 2 tons, dry. 89 



Green corn i li tons. 85 



Red clover 2 tons, dry. 105 



Lucern 8 tons. 113 



Sugar-cane 20 tons. 153 



Sorghum 15 tons. I2I 



Cotton 750 lbs., seed. 26 



Hops 600 lbs., seed. 84 



Tobacco , 1 ,600 lbs. 



Grapes 2 tons. 



Cabbage 31 tons. 



Cucumbers 25 tons. 



Onions 11^ tons. 



Oranges 10 tons. 



Food for 

 Plants 



'^7 



Nitrogen. 



59 



51 



46 



55 



67 



35 



46 



69 

 150 



89 



32 



150 

 86 

 72 

 24 



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