208 



acre, and the same fertilizers in half the quantities named 

 above, were employed. No nitrogenous fertilizer was applied 

 to any plot. One plot received no fertilizer of any sort. 



In the following table $10 per ton is assumed as the price 

 of hay : 



Fertilizer experiment with hairy vetch. 



Although liberal amounts of commercial fertilizers had 

 been used in this field for several years previous, mineral 

 fertilizers were profitably applied to hairy vetch. The larger 

 application of fertilizers was more profitable than the smaller. 



It is believed that on average sandy land and in seasons 

 of normal rainfall the effects of fertilizers wonld have been 

 more pronounced. 



Leguminous plants (such as vetch, clover, cowpeas, etc.,) 

 when amply supplied with tubercles, need no nitrogenous 

 fertilizers, but are highly responsive to acid phosphate and 

 potash salts. These plants make heavy demands on the 

 mineral plant food of the soil. 



