me AA 
CEREALS AT THE AKRON FIELD STATION 8) 
lished, and the total evaporation in inches by months from April to 
September, inclusive, is shown in Table 38. The evaporation is de- 
termined from a free water surface, the method being that employed 
at all of the stations where the Biophysical Laboratory of the Bureau 
of Plant Industry has cooperated. 7? 
TABLE 2.—June and seasonal precipitation and yields of Kharkof winter! and 
Peliss durum spring wheats grown at the Akron Field Station during the 15-year 
period, 1908-1922, inclusive 
Pr fe Acre yield (bushels) 
Year | - 
| Apnil'to | Kharkof | Peliss 
June ee, wheat wheat 
O73), Se De ides celta ce eens Sein ee ae aN ee. See ee a 2. 37 9.7 19.3 | 24.7 
Mp ed es ta ee rd Oren Geers Wiehe tien m Mecy ie Reger Foe 10,20 @ye 2] 23.6 
i ee Cl eh ea ey in ea ie aa NY 1. 38 | 8. 87 29.8 15.8 
LL ake DeRose Cea 1. 48 6. 60 14. 2 | 10.6 
SE eRe Ot: bofa Ate Rey In ee es Fae ot F529: | ae k2: 32 37.5 35.6 
id [ RT SR SP Bc OnT a ee ee iene oan 2 ee 1.35 | 6. 83 16. 6 | 10.5 
Pie eae Leap eee eer ee a ee oe ee 3.54] 10.67 26.0 | 26. 6 
ie ee po Pee & Rips OYA TR EEN a 3.75 14.17 29.2 31.6 
Repet Me ticng hE NNER, Wc Rete 1S ea Foal eS. 5 ape 2.09 | 7. 69 | 26. 2 14.4 
CIE. ee ott tet =o" AG ee See © ye eee ee 56 10. 83 | 16.9 28 
1 oe ee es 2 ee Be ee oer ee 96 7. 02 | 12.3 | 307 
LOT EL cee cee nee pe a poe pe a rl ey 8 ape wp ee 2.27 | 7.61 317.6 | 8.8 
Sein nee eye oe a eS a ee eS 3.97 14. 87 16.1 | 16.9 
AE gee Buh ey Se AO EE Sa 8 ety hie Se ee en 1324 7.44 13.0 | 9.1 
Mio e WT OAT GOR Sete ete ee Ps Te AS oe ee A £43) — 12.95 14.2 | 7.9 
IR TET oe Gere a EEN ee ea eA iar ge ier ee eee 2.21 | 9. 81 19. 3 | 16.5 
1 Wheat previous to 1917 usually was sown on fallow; yields for 1917 and succeeding years are averages of 
plats grown on fallow and on cornland. 
? No winter wheat survived the winter of 1908-09. 
3 Winter wheat was not sown in the varietal plats in the fall of 1918, and the yield given for 1919 is the 
average of two increase plats of Kharkof. 
The average evaporation for the six months from April to Sep- 
tember, inclusive, during the 15 years from 1908 to 1922, was 43.048 
inches. The lowest total evaporation, 33.55 inches, was recorded 
in 1915, the year of greatest rainfall durimg the same months. The 
highest total evaporation, 48.818 inches, was recorded in 1911. 
The precipitation from April to September was lower than that of 
1911 in only two years. Thus, the evaporation usually varies in- 
versely with the precipitation, though this is not always the case. 
The ratio of precipitation to seasonal evaporation, also given in 
Table 3, shows the evaporation for the 15 years to be more than 
three times the precipitation. In 1915 and 1920 the ratio was narrow- 
est, and in 1911, 1916, 1919, and 1921it was widest. The ratio of pre- 
cipitation to evaporation is a fair indication of the seasonal moisture 
conditions as related to crop yields. 
WIND 
Records of wind velocity have been kept at the Akron Field Station 
since 1908. The average monthly velocities vary to a considerable ex- 
tent, but the annual velocity is usually between 6 and 7 miles per hour. 
As a rule the atmosphere during January and February is quiet 
except during the snowstorms, which often become blizzards. During 
March, April, and May the most severe windstorms and the highest 
7 Briggs, L. J., and J. O. Belz. Dry farming in relation to rainfall and evaporation. U.S. Dept. Agr., 
Bur. Plant Indus. Bul. 188, p. 16-20. 1910. 
5421—257 2 
