PURCHASE AND USE OF FERTILIZERS 



329 



(/) All the plots must be treated alike in every respect, except 

 as to the amount and kind of fertilizer applied. The same kind 



Fig. 76. Plots for a fertilizer and rotation experiment, four sections of 40 

 plots each. The plots marked (X) are check plots. Ohio Station. 



and quality of seed must be used over the entire area. The 

 plowing or sowing on all the plots must be done the same day. 



22 



