6 BULLETIN 402, U. S. DEPARTMENT OF AGRICULTURE. 
inches in 1915. The seasonal precipitation has been closely corre- 
lated with the yield in bushels per acre. The average precipitation, 
as computed from records of the 11 years, will probably be reduced 
when the records from a longer series are available. This is evident 
from the fact that at Leroy, Colo., the 25-year normal precipitation is 
17.19 inches (Table II). Leroy is located about 30 miles northeast of 
the Akron Field Station and is subject to similar climatic influences. 
The average precipitation during the 11-year period, 1905 to 1915, is © 
19.51 inches at Leroy and 19.72 inches at the Akron Field Station. 
A droughty condition often prevails from about June 15 to August 
31. The precipitation which falls during this period usually comes 
in the form of light showers. As the temperatures are high during 
the summer months, this precipitation is rapidly lost by evaporation. 
Table III, which gives the daily precipitation record at the Akron 
Field Station for 1914, illustrates this point. This table shows that 
from June 15 to October 8 there were only two rains of more than 
0.25 inch. 
Taste III —Daily precipitation recorded at the Akron Field Station, Akron, Colo., 
for the year 1914. 
[Data (in inches) from the records of the Biophysical Laboratory ofthe Bureau of Plant Industry. T=trace.] 
1914 Jan. | Feb. | Mar.| Apr. | May.| June.| July.; Aug. | Sept.} Oct. | Nov.| Dee. 
| 
1 Eig ate: bd Seteeh ee a a ashe tn pip rig EE Sl be le Fe A ed (Beet emer 0.25 | 0.81 | cheater So ae ey cc | Ee 
ye Ree SR EY Son BE Ey NE AN | ae at eee Sse OS 200 | Stee eee 0: 02)| 28:2 s|Lepe as 3 315 eee 
3 atlas Asati Nee Gece ke oe Mawes NO oe peters be ee PLS | Pas ae Pee cea) le se ae ee tees of A ea ee 0.97: 5.35.2 eee 
es eee ie ay Hs ee it a as is er Sy SS Se Po) La ee 
Leia d pins hE NMR o Bir Jy. Sa aed eR et O5027|-ae pA Ieee (aed Bate | aaa Pikes [i cesk ot ee Se ee ee eee 
1 ee essa ern ee ee ee Se SN PU Ee eee. See Ree (ee ss ae 1 YA [ee eae eee eet 57h BS ok 0.07 ee [es ii 0.10 
Moe ee no ee ee, | eer | ee ee | ere Li eee fies | Sere A te ee ‘Ae ID sare 40 
SSE en Rae Dea gs eS pT (Sees as So eal ek Oy ee |e es bee ay acs atal Se Ain 0s 26: Soeur 10 
Dee 5S ee Da ete See 0203) |= T Ri Gh Eee ie Care ee ee ee 02 51 P| | eet 10 
eRe eS sue Papa SES See eee SEL eee os sce fet ee lly AAR ost Se Ie ee 
LE Sa pert See foe bi A Des Be ata | a RUS tal AE ee oe) |. Ney | Md a a SF -10 LOTS =. SE eee Set oe eee 
HDR ee eS ES a te 1 UD ee ca Ge Pe | ey Se eee -11 A Ne (ee Pye 1 ee 
11S es Pay tal Gea ld Seen cs De i (Re) [ee oe Ci fe oe A 90 S26 eee oe 0.01 06.|2- | See 
J hc Uae oye aie in Mies Oy Ae eee RY Leman | In, Soe Lee Spe 2) sree Bh) ee 2 24 TN. olcc edhe. |S Sl eee 
LGC A a TS et eae ere, ome | RTs Ol OD (ee ee tb J a 6 ASS). AT WES ae eee sls eee ae 
YT py Se See ter eet S, Seger oa Neen | Pe ee | | ee - 46 LOS 1s Gee A i lle oP, Z | oe eet 0:10:|- 228 
Eee ee Nn Ne ee ee Ae Be eee SSIS. eee 7 PTS Be te = Se 47 10: See ccce 2 Eee eee 
i ch gen 8 ae RS, a | Aes pees 7 AME Ae ee o20 A pl (ee eR oe Pe ee Vere 
AO eer ee ee eee ee ee een T of Ip amty (Seem | (RESIS 1 Vee Se oe As O30 ties ees ee See 
DA) a ag ta Se ey ee eS EP See tee [cee » O14ha5 04 de eee es 
ieee OPT eo ee She ere i eee ee inetd | ba eee TS SAS LE Ee oe /06:3)-2.23 20 
PN BY tee LE SORT AER tag, 20, SENS (chy, Glee al ee eee .02 of Nagy (ene TD Ape ee ee ay (J a Se - 
eve Re Cet MRIS ere ee See AIRS Pea ee | Lee eee SY (a res (eine ee | SOD eo 06.15.5320) ae 
7), WoT Ee Sees eee eer [ea ee oe A Ve Oia Ab TT iat tT hee Pipl a ey Pernore| (See Ss 
PAST faa: Nae gre PS 9 cede oye BERN (ARE uate Uncen 1 [ie et LVR IMEAR «| bi iGiay 1S fasta rT. By) ty cee pes he eS a 
71 Cys. GRE a ae ma Ss anh ON er am a A, Le bea or ae as Ee Ae By 775| Parreatantedl Pe ene bee SA oe 
aes. Ne ee 2 tee ek Wee AEE ee tae ee MEY yn! Hee Oy Ay SO Rn ees SOUR ie en ee eee a ee 
Doses TEES = ek Soe Ce oe Ve Ae | ee 0.20) & ee ese 2 08 1c fa cl ee eee ee 
DS eid a a Ba eel 2 peace Sala ae f is | ied 2 |B AP fie RBS & eked BAY Dag 2 Sol |--ooee loo eae 
cn ER ae a ELE a besa eer TV Ac O7ee eee { 7 65) e022 a ee 
cS aie HE Wie ea De Te Ta PTE eo a Oe a We re We ae ee i a CE (cet 
Dital ec ee A) 587 -20 | 4.01 ao 1.66 | 1.05 23 | 2.08 | .10 -90 
EVAPORATION. 
As a factor affecting crop production the seasonal evaporation 
probably ranks next in importance to precipitation at the Akron Field 
Station. The total evaporation from a free water surface for each 
