CEREAL CULTIVATION WESTERN AREA 385 



FIG. 



22. Wheat after rye and vetch turned under at Modesto, 

 California, 1908. Compare with Fig. 121. 



less cost of harvesting and thrashing in each case, the 

 difference in profit in favor of the latter method being 

 $18.73 (Figs. 120-122). 



Experiments in green-manuring were also conducted at 

 the California State Experiment Farm during the 4 years 

 1907-10, with results as given in the table following: 



TABLE VIII. EFFECT OF DIFFERENT METHODS OF CROPPING 

 ON THE YIELD OF WHEAT ON HEAVY SOILS AT DAVIS, CALI- 

 FORNIA, 1907-10 



TREATMENT 



ACRE YIELD IN BUSHELS 



Wheat after wheat 



Wheat after fallow 



Wheat after horse beans turned under . 

 Wheat after field peas turned under . . 



Wheat after wheat 



Wheat after horse beans turned under 



and followed by Kafir corn .... 



Wheat after rye and vetch turned under 



Wheat after burr clover turned under . 



2c 



32.7 

 41.6 

 43.1 

 43.3 

 38.6 



42.3 

 44.4 



48.2 



