2 BULLETIN 8386, U. S. DEPARTMENT OF AGRICULTURE. 
are applicable to a greater or less extent to a large part of the south- 
ern Great Plains area. 
This bulletin contains (1) a description of the district to which 
the results apply, (2) a description of the Woodward Field Station 
and the scope and methods of the experiments there conducted, and 
(3) the results obtained. 
DESCRIPTION OF THE DISTRICT. 
The section here described includes the plains of Oklahoma and 
Kansas, a large portion of Texas, and a small portion of southeast- 
ern Colorado and of eastern New Mexico. An outline map of this 
district is shown in figure 1. It includes the main districts producing 
the Dwarf broom- 
corn crop and a few 
localities where the 
Standard variety is 
crown. It contains 
at present approxi- 
mately 300,000 acres 
of broom corn, or 
UMhitdyy | about 87 per cent of 
: the entire acreage 
grown in thiscountry. 
TOPOGRAPHY. 
The section just 
outlined lies between 
the ninety-eighth 
meridian on the east 
and the one hundred 
and fourth on the 
Fig. 1.—Outline map of the southern Great Plains region, west. It extends 
oa ees Se aa district producing the Dwarf north to the northern 
boundary of Kansas 
and south to the thirtieth parallel in Texas. In general, it consists of 
broad rolling plains interrupted for the most part chiefly by the shal- 
low valleys of the larger rivers. The altitude ranges from approxi- 
mately 1,000 feet to 4,500 feet above sea level. The average annual 
rainfall varies considerably in different parts of the district, ranging 
from about 15 inches in some parts to 30 or more inches in others. 
SOIL. 
The soils of the area are naturally variable. Those of the 
eastern part have been exposed to greater precipitation and have 
