FOOD FOR PLANTS 



103 



such as is only to be found commercially as Nitrate of 

 Soda. 



The plant food needs of a crop of 30 bushels of 

 wheat per acre amounts to about 70 pounds of Nitro- 



Fertilizer Experiment with Wheat. 



*»" 



Phosphoric Acid Phosphoric Acid Phosphoric Acid and 



and Potash with 1 oz. and Potash with Vi oz. Potash without 



Nitrate of Soda. Nitrate of Soda. Nitrate of Soda. 



Yield: 31/5 oz. Grain. Yield: 1% 02. Grain. Yield: i/L- oz. Grain. 



