8 



BULLETIN 30, TJ. S. DEPARTMENT OF AGRICULTURE. 



heading and ripening. During the past five years, however, there 

 has been no such serious effect on the crops at the Nephi substation 

 except in the case of spring grains. The season of 1910 was the most 

 severe of any of the past five. 



EVAPORATION. 



2.0 



La 



A5 



\ 



\/o 

 'sos 



kO.7 



0.6 



05 



0.4 



03 



0./ 



J/IV FfB M/!/? /IPR M*r Jt/N£ JW.V /4U6. SEPT OCT A'OK 0£C. 



Since 1 908 the daily evaporation has been recorded for the months 

 of April to October, inclusive. The method of determining the evapo- 

 ration is that employed 

 at all of the stations 

 where the Biophysical 

 Laboratory of the Bureau 

 of Plant Industry has been 

 cooperating; hence, the 

 results obtained at Nephi 

 are made directly com- 

 parable with those ob- 

 tained at other points. 1 



The average evapora- 

 tion at Nephi during the 

 six summer months from 

 April to September, in- 

 clusive, for the past five 

 years has been 45.57 

 inches. This amount is 

 practically an average of 

 the amounts determined 

 by the Biophysical Lab- 

 oratory at the various 

 dry-land experiment sta- 

 tions in the Great Plains 

 area and westward. 



The average daily 

 evaporation by months 

 and the monthly evapo- 

 ration (in inches) at the 

 Nephi substation for the six summer months of the five years from 

 1908 to 1912, with the 5-year averages, are given in Table III. 



1 Briggs, L. J., and Belz, J. O. Dry farming in relation to rainfall and evaporation, U. S. Department of 

 Agriculture, Bureau of Plant Industry, Bulletin 188, p. 10-20, 1910. 



































k 





















A 





A 





















A 

























/ 



\\ 

























V 

























V 























































































\ 



/ 























V 

























































































/ 























/ 















































































































Fig. 6. — Graph showing the average monthly precipitation in 

 inches during the 15-year period, 1898 to 1912, inclusive, at 

 the substation, Nephi, Utah. 



