256 SYSTEMS OF PERMANENT AGRICULTURE 



TABLE 40. CROP YIELDS PER ACRE IN OHIO EXPERIMENTS WITH MANURE, 



PHOSPHATES, KAINIT, GYPSUM, AND "COMPLETE" FERTILIZERS 



Average of Three Series 



1 In the field, plots i and ii, 2 and 12, etc., lie end-to-end, plot n being essen- 

 tially a continuation of plot i, etc. 



2 The "complete" fertilizer applied to plot 18, every three years, contains 160 

 pounds sodium nitrate, 80 pounds acid phosphate, and 80 pounds potassium 

 chlorid. 



3 The "complete" fertilizer applied to plot 19, every three years, consists of too 

 pounds of slaughter-house tankage (containing 6 pounds of nitrogen and 6 pounds 

 of phosphorus), 80 pounds of acid phosphate, and 10 pounds of potassium chlorid. 



