In the flowerpots on the left is wheat supplied, first, with potash ; second, with potash 

 and phosphoric acid; third, with potash, phosphoric acid, and nitrogen. The tubes below 

 show the relative yield of grain. 



In the flowerpots on the right is vetch supplied, first, with potash ; second, with potash 

 and phosphoric acid; third, with potash, phosphoric acid, and nitrogen. The tubes below 

 show the relative yield of seed. 



FERTILIZING EXPERIMENT WITH WHEAT AND VETCH 



