570 Thirty-second Annual Report 



Beardless barley was sown in an alfalfa field which is to 

 be plowed later in the season. This very materially increased 

 the tonnage of hay obtained from this field. As a feed for 

 horses this mixture of fairly well-matured barley and alfalfa 

 has proved to be almost ideal. 



VII. EFFECT ON FIELD CROPS OF DYNAMITING SUBSOIL 



The results secured in 1920 with this project were the same 

 as in 1918 and 1919, namely, there was no appreciable difference 

 between crops grown in soil that was dynamited and in soil 

 that was not so treated. 



VIII. VARIETAL AND CULTURAL TESTS OF GRAIN AND FORAGE 

 CROPS AND OF GRASSES AND MISCELLANEOUS CROPS 



Under this project more extensive tests were made with 

 Rhodes grass than in previous years. One planting on ex- 

 tremely alkaline soil has withstood two winters and is now 

 starting the third summer with vigorous growth and a full 

 stand. Rhodes grass promises to be of considerable value as a 

 pasture crop on the alkaline soils of our lower valleys. 



Napier grass gives a large yield, but because of its vigor- 

 ous growth the stalks soon become hard and woody which 

 renders them inferior for silage. This grass does not bear seed, 

 but is propagated from cuttings, which makes it less desirable 

 than the common varieties of sorghum. 



IX. COOPERATIVE CROP EXPERIMENTS 



This project enables us to distribute good seed to farmers 

 who will give it good cultural treatment; it also enables us to 

 test crops under different soil conditions and at various alti- 

 tudes. Under this project four hundred and fifty lots of seed 

 were supplied to farmers in various parts of Arizona during 

 the growing season of 1920. In the spring of 1921 more than 

 600 lots of seed were supplied to cooperators. In a majority 

 of cases cooperators have furnished satisfactory reports con- 

 cerning the adaptability of varieties, hardiness, yield, and 

 other data. 



X. A STUDY OF INDIAN AGRICULTURE 



In this project a detailed study has been made of the 

 conditions under which different tribes of Indians carry on 

 dry-farming operations. Considerable attention has been given 



