384 



THE SMALL GRAINS 



TABLE VII. EFFECT OF DIFFERENT METHODS OF CROPPING 

 ON THE YIELD OF WHEAT AT MODESTO, CALIFORNIA 



TREATMENT 



ACRE YIELD IN BUSHELS 



Wheat after wheat (1 year only) . . . 



Wheat after summer tillage 



Wheat after field peas turned under . . 

 Wheat after horse beans turned under . 

 Wheat after rye turned under .... 

 Wheat after rye and vetch turned under 



15.66 



33.3 



36.5 



37.6 



52.3 



54.0 



The first year the cost of the summer tillage method was 

 $2.70, and that of the improved method of wheat after 

 rye as a green manure $7.30 to the acre, up to the time of 

 harvesting. At $1.00 a bushel for wheat, the summer 

 tillage method gave a profit of $28.00 $2.70 = $25.30, 

 and the green-manure method $51.33 $7.30 = $44.03, 



FIG. 121. Wheat after wheat at Modesto, California, 1908. 

 Compare with Fig. 122. 



