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SUDAN GRASS AND RELATED PLANTS. . 19 
from Apache County, Ariz., in 1915, this grass produced a hay crop 
4 to 5 feet high and sometimes matured seed without irrigation at an 
altitude of 6,000 to 6,800 feet, and in 1916 it grew 5 to 6 feet high and 
yielded 2 tons to the acre under irrigation at Eagar, Apache County 
(7,600 feet). At Currie, Elko County, Nev. (7,380 feet), 1 ton per 
acre without irrigation was reported in 1916. At Santa Fe, N. Mex. 
(7,000 feet), one satisfactory, cutting was secured on dry land, but two 
or three farmers in that State report entire failure at 8,000 feet. In 
southwestern Colorado at altitudes of 6,500 to 7,000 feet, Sudan 
grass grew 3 to 5 feet high and made satisfactory hay cuttings. It 
attained a height of 2 feet at Placerville, San Miguel County (9,000 
feet), and did equally well at Grand Valley, Garfield County, which is 
over 8,000 feet high. Many failures, however, have been reported 
from Colorado, especially in 1915, at altitudes above 6,000 feet. In 
Wyoming Sudan grass has been a failure at Laramie (7,000 feet), has 
sometimes grown 3 to 5 feet high at Cheyenne and other points at 
6,000 feet, but has appeared to be valuable only in the northeastern 
part of the State at the lower altitudes (4,000 to 5,000 feet). In 
Utah in 1916 Sudan grass grew but 24 feet high at 6,500 feet in Grand 
County, made 1 tons per acre at 7,000 feet in San Juan County, but 
froze at 8,300 feet in Carbon County when 4 inches high. In Montana 
under irrigation Sudan grass produced 4 tons of hay per acre in 1914 
and 3 tons in 1916 at Bozeman (4,887 feet), but has been satisfactory 
in less than half the dry-land tests in Fergus County (4,000 feet). In 
Idaho and Oregon the crop has been successful only in the lower 
altitudes, frost having killed or injured many plats on the dry lands 
of those States above 3,000 or 4,000 feet high. In both Oregon and 
Washington Sudan grass has been found valuable only at the lower 
altitudes. It can be planted with a reasonable chance of success in 
the valleys, both to the east and to the west of the Cascade Range. 
In the Willamette Valley, Oreg., and along the coastal plain in Wash- 
ington other forage crops, such as alfalfa and the small grains, which 
will outyield Sudan grass, are available, but even in these localities it 
can be profitably used for soiling and as an emergency hay crop. 
The limit of altitude for seed production is at least 1,000 feet lower 
than for hay, because under cool conditions it takes a month or more 
to mature seed after the crop has reached the proper stage of maturity 
to cut for hay. 
MOISTURE REQUIREMENTS. 
The drought endurance of Sudan grass is equal but not superior to 
that of the best sorghums. Its extensive fibrous root system enables 
the crop to grow as long as there is any available moisture in the soil. 
It has repeatedly shown ability to discontinue growth but continue 
alive during a period of drought and then revive quickly and grow 
vigorously when rain comes, It must have moisture, however, and 
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