WHEAT PRODUCTION ON DRY LANDS. TI 
The average frost-free period at each station 1s shown in Table 5. 
Frosts in the late spring or early autumn rarely damage the wheat 
crop at these stations, though severe winter temperatures may i 
sometimes cause winterkilling of fall-sown grain. During the period : 
for which data are available the latest spring frost recorded at Lind f 
was on June 8, in 1901, and the earliest autumn frost on September 4 
27, in 1901. The latest frost in the spring recorded at Moro was on , 
June 1, in 1917; the earliest autumn frost on September 3, in 1912. 4 
The latest spring frost at Nephi was on June 22, in 1916, and the 
_ earliest autumn frost on September 4, in 1912. b 
| 
| 
——— 
Se es ee 
Fic. 9.—Fall-plowed land at the Nephi Substation in 1909, to be left rough during the winter in order 
to catch rain and snow. | 
y)- 
a 5.—Frost-free period at Moro, Oreg., Lind, Wash., and Nephi, Utah, for the years 
| 
specified. 
= Lind, || a Moro Nephi | Moro, Nephi 
Year. Wash! Year. Oreg. Utah. ! os Oreg. Utah.’ 
i| -— 7 5 
Days. Days. 
144 | 
Average... OEM LESS] as 32 MT OL hee eee See hoe td | eee Le ee ae 145 | 111 
1 United States Weather Bureau data. 
we 
