Food for 

 Plants 



96 



Quantity of Fertilizer Required for Hay Crop. 



As a guide in making up fertilizers tor grass, the follow- 

 ing figures based on the analyses made during these experi- 

 ments will be of interest. 



Fertilizer Elements in Crop of Grass Hay. 



In calculating the profit from the use of fertilizers only 

 the fertilizer cost of the crop was considered, the labor and 

 the rent of the land being left out of account. The exact 

 cost of th"; materials used was taken and the hay was rated 

 at a low market value, due regard being paid to quality, as 

 indicated on page 94. 



Since only the amount of Nitrogen differed on the three 

 plats it may be well to consider first the gain from its use. 

 This is shown below : 



Profit from Use of Nitrate of Soda. 



But the Nitrate was efficient not alone by itself, but 

 through the stimulus it gave the plants it caused better 

 utilization of the other elements of plant food. To get, 

 therefore, the full measure of its value, we must consider it 

 as an element in the complete fertilizer and calculate the 

 profit on this basis. These figures show the following gains : 



