Arizona Agricultural Experiment Station 571 



to the soil types selected by these Indians. Photographs have 

 been taken to illustrate the methods employed by the Indians 

 in preparing ground for field crops and for gardens, and field 

 notes have been taken to show the varieties used and the 

 methods of planting. The results of these investigations will 

 be published within the next year, and we believe this data will 

 be of interest and value to dry-farmers. 



XI. SEED CERTIFICATION WORK 



For more than two years the Agronomy Department has 

 cooperated with the County Agent of Yuma County in inspect- 

 ing fields of alfalfa and certifying as to the varieties grown 

 and their purity. This work has made it possible for the grow- 

 ers of alfalfa seed to market their product in such a way 

 that it has brought many thousand dollars more than would 

 have been possible without certification. This work was car- 

 ried long enough to prove its value, and then it was taken 

 over by the Yuma County Farm Bureau. The County Agent 

 and the Agronomy Department continue to act in an advisory 

 capacity. 



EXTENSION WORK 



Throughout the period covered by this report one-half of 

 the time of S. P. Clark has been given to extension work along 

 agronomy lines. This work has included writing newspaper 

 articles, dehvering lectures at institutes, farm bureaus and 

 other public meetings, judging field crops at county fairs, 

 visiting the various counties in the State, and making numerous 

 farm tours with county agricultural agents. A total of 7093 

 miles was traveled on the railroad and 2722 miles by automo- 

 bile. The head of the Department has also been called upon to 

 do some extension work of a similar nature. 



PUBLICATIONS 

 During the fiscal year closed June 30, 1921, the following 

 publications have been prepared by the Agronomy Department : 

 experiment station circulars 



Sweet Clover in Arizona. 

 Sudan Grass in Arizona. 

 Hegari in Arizona. 

 Rhodes Grass in Arizona. 



mimeographed extension leaflets 

 Broomcorn in Arizona. 



Tentative Agricultural Program for the Salt River Valley. 

 Green Manure Crops for Arizona Orchards. 

 The Pit Silo. 



