64 



EXPERIMENTS UPON WHEAT 



Table XXV. — Effect of Wet or Dry Autumns on the increase of the 

 JVheat Croi) due to FallovAng (1870-1902). 



For the wet autumns, however, with an average rainfall of 

 13 -66 inches and a percolation of 8-92 inches, the wheat after 



Small Rainfall and Percolation 



Large Rainfall and Percolation. 



CROP 

 -30001b, 



RAiN 

 Inches 



Rainfall -Inches] ^^ Wheat after Wheat - lb. per Acre 



> Sept.toDec. 

 R??^ Percolation -inches I [JJ^ Wheat after Fallow - lb. perAcre , 



mB Increase due to Fallowing. 



Fig. 9.— Effect of Wet or Dry Autumns on continuous Wheat, and Wheat 

 alternated with Fallow. 



