CEREAL INVESTIGATIONS AT THE NEPHI SUBSTATION. 9 



Table III. — Average daily and total monthly evaporation (inches) at the Nephi sub- 

 station during each of the six summer months for five years, 1908 to 1912. 



Year. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Six 

 months. 



Average daily evaporation: 



1908 '. 



*0. 16 

 .12 

 .19 

 .16 

 .12 



*0.23 

 .19 

 .24 

 .27 

 .20 



0.26 

 .29 

 .36 

 .29 

 .31 



0.34 

 .31 

 .32 

 .28 

 .30 



0.30 

 .23 

 .32 



.34 

 .27 



0.21 

 .19 

 .20 

 .22 

 .21 



0.25 



1909 



.22 



1910 



.27 



1911 



.26 



1912 



.24 









.15 



.23 



.30 



.31 



.29 



.21 



.25 







Total monthly evaporation: 

 1908 



*4.80 

 3.64 

 5.82 

 4.93 

 3.54 



*6.98 

 5.99 

 7.46 

 8.41 

 6.30 



7.87 

 8.81 

 10.90 

 8.69 

 9.28 



10.52 

 9.47 

 9.98 

 8.72 

 9.24 



9.34 

 7.03 

 10.09 

 10.47 

 8.89 



6.23 

 5.59 

 6.01 

 6.69 

 6.16 



45. 74 



1909 



40.53 



1910 



50.26 



1911 



47.91 



1912 



43. 41 









4.55 



7.03 



9.11 



9.59 



9.16 



6.14 



45.57 







* The evaporation tank was not installed until June, 1908; hence, the evaporation for April and May, 

 1908, has been interpolated. 



The lowest total evaporation, 40.53 inches, was recorded in 1909. 

 The highest, 50.26 inches, was recorded in 1910. The high evapora- 

 tion of 1910, coupled with- the scarcity of rainfall, made that year a 

 severe one in dry-land crop production. The lowest average daily 

 evaporation has been recorded in April and the highest in July; how- 

 ever, there is little difference in the evaporations of June, July, and 

 August. 



The anemometer used at the Nephi substation was not obtained 

 until the spring of 1909, and for this reason a record of the wind for 



1908 is not available. Since 1909 a complete record of the wind dur- 

 ing April to October, inclusive, has been kept. The anemometer has 

 stood next to the evaporation tank and has recorded the wind which 

 has passed directly over the tank at a distance of about 2 feet from 

 the surface of the ground. The average wind velocity (in miles per 

 hour) during the months from April to October, inclusive, for the years 



1909 to 1912, inclusive, is presented in Table IV. 



Table IV. — Average wind velocity (miles per hour) at the Nephi substation by months 

 for the period from April to October for the years 1909 to 1912. 



Year. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Average. 



1909 



4.7 

 5.3 

 4.3 

 4.4 



4.6 

 4.6 

 6.0 

 5.2 



4.1 

 5.4 

 4.9 

 4.8 



4.1 

 4.4 

 3.7 

 4.3 



3.3 



4.4 

 4.4 

 3.9 



3.7 

 3.9 

 4.6 

 4.1 



3.6 

 3.2 

 3.4 

 3.2 



4.0 



1910 



4.5 



1911 



4.5 



1912 



4.3 







Average 



4.7 



5.1 



4.8 



4.1 



4.0 



4.1 



3.3 



4.3 



Table IV shows that the average wind velocity per hour at Nephi is 

 comparatively low, and that there is little difference among the 

 9679°— Bull. 30—13 2 



