794 
Journal of Agricultural Research 
Vol. XXVIII, No. 8 
and radiation and wet bulb depression. On this basis the transpiration during 
the summer season should be very high in this desert if plants were in an actively 
growing condition. This, however, is not the case, since practically all plant 
growth is made during the late winter and early spring months. If comparisons 
are made between conditions at Akron, Colo., and Bard, Calif., during the period 
TYPE or \OE3E7TT OESEPT CPEOSOTE 3POEBPUSM SPGEEPOSM 
PESETAT/Oh) SAGE. &9GE. BCASM 
ELEM9T/OA/ -20FT. 2033FT. 2860FT. 3970FT. 6200FT. 
3TAT/OA/ /A/0/O, CAUF E&PEGAS, A/EP FT GEORGE, UTAH PAROHAH, UTAH YELLOJTG7VA/E PARE. 
iifififn 
dfatm iaut 
8 . 6 / 
30YP8. 
/3.00 
30YP8. 
/8.80 
34-YPS. 
Fig. 21.—A comparison of the vegetation with rainfall and temperature at Indio, Calif., Las Vegas, Nev , 
St. George and Parowan, Utah, and Yellowstone, Wyo. The graph shows monthly rainfall, monthlj 
and annual mean, monthly absolute maximum and minimum, and monthly mean maximum and mini¬ 
mum temperatures. In addition, the mean annual rainfall, the mean annual, the annual maximum, 
the mean maximum, the min imum and the mean minimum temperatures, and the length of each record 
in years are given in figures below each graph. The type of vegetation and the name of the station with 
the elevation above sealevel are shown at the bottom of each column of graphs. 
of growth it is evident that the plant growth is this desert region is not subjected 
to conditions as extreme as at Akron, Colo. The months January, February, and 
March at Bard correspond as regards the time of active growth with May, June, 
and July at Akron, Colo. During these periods the light intensity 10 at Bard is 
i® Kimball, H. H. variations in the total and luminous solar radiation with geographical 
POSITION IN the united states. Mo. Weather Rev. 47:769-793, illus. 1919. 
