64 



EXPERIMENTS UPON WHEAT 



TABLE XXV. Effect of Wet or Dry Autumns on the increase of the 

 Wheat Crop due to Fallowing (1870-1902). 



Taking the seasons of small rainfall, averaging 8*88 inches 

 for the four months September to December inclusive, the 



Small Rainfall and Percolation 



Large Rainfall and Percolation. 



CROP 

 -3000 Ib. 



RAIN 

 Inches 



25 



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



vSept.toDec. 

 h:;;v"v1 Percolation -Inches] I I I I I I Wheat after Fallow- I b. perAcre. 



|^m Increase due to Fallowing. 



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

 alternated with Fallow. 



