KELATION OF YIELD TO RAINFALL IN THE GREAT BASIN. 28 



RELATION OF YIELD TO RAINFALL. 



In order that the prospective settler may form an idea of the 

 yields that he can reasonably expect to obtain in regions of limited 

 rainfall, there is given in the following pages a summary of the yields 

 obtained, at a number of experimental farms conducted under state 

 and federal supervision. 



RELATION OF YIELD TO RAINFALL IN THE GREAT BASIN. 



During the years 1904, 1905, and 1906 the Utah Agricultural 

 Experiment Station conducted experiments at six dry-farming sta- 

 tions in Utah. a The following table shows the average yield of 

 wheat obtained by summer-fallowing methods at these stations dur- 

 ing the three years. The table shows the yearly precipitation, the 

 precipitation that occurred during the growing season from April 1 

 to July 20, and the corresponding yield. 6 The location of the coun- 

 ties may be seen by referring to the Utah precipitation map, page 44. 



Table II. — Relation of precipitation to yield of Lof (house wheat on summer-fallowed 

 lands at six dry-farming stations in Utah. 



[From Bulletin No. 100, Utah Agricultural Experiment Station.] 



County and year. 



Iron: 



1904 



1905. ... 

 1906.... 



Juab: 



1904.... 

 1905. ... 

 1906 



Tooele: 



1904. ... 



1905 



1906 



Sevier: 



1904 



1905 



1906. ... 



Washington 



1904 



1905. ... 

 1906 



San Juan: 



1904 



1905 



1906 



Yearly pre- 

 cipitation, 

 August 1 

 to July 31. 



Inches. 

 13.4 

 9.9 

 15.9 



15.4 

 11.3 

 18.4 



18.5 

 12.4 

 13.0 



13.2 

 11.5 

 15.5 



13.4 

 10.9 

 16.6 



6.6 

 19.0 

 20.0 



Seasonal 

 precipita- 

 tion, April 

 1 to July 20 



Inches. 

 3.8 

 2.8 

 3.2 



3.9 

 3.1 

 6.3 



4.6 

 3.2 

 4.5 



6.0 

 4.1 

 4.6 



2.2 

 2.9 

 4.1 



2.8 

 5.3 

 4.8 



Yield of 



wheat per 

 acre. 



Bushels. 



°> Bulletin 100, Utah Agricultural Experiment Station, by W. M. Jardine. 



b The writers are indebted to Mr. W. M. Jardine for assistance in compiling the 

 yields given in this table. The figures are based upon the average yields of Lofthouse 

 wheat plats and represent in most cases the average of the Lofthouse wheat yields 

 in the variety tests, in the depth-of-plowing tests, and in the time-of-seeding tests, 

 3 to 5 plats in all. In the depth-of-plowing tests the yield of the plat plowed 8 inches 

 deep was taken when possible, and in the other cases the average of the yields from 

 the plats plowed 5 inches deep and 10 inches deep was used. In the time-of-seeding 

 tests the yields of the plats sown on dates recommended in the bulletin were used. 

 These figures, therefore, represent the yields of wheat grown under conditions generally 

 advocated in the region, viz, on land plowed 8 inches deep and summer-fallowed. 

 188 



