UNITED STATES DEPARTMENT OF AGRICULTURE 
DEPARTMENT BULLETIN No. 1175 
Washington, D. C. 
September, 1923 
GRAIN-SORGHUM EXPERIMENTS AT THE WOODWARD FIELD STATION 
IN OKLAHOMA. 
By John B. Sieglixger,. Assistant Agronomist, Office of Cereal Investigations. Bureau 
of Plant Industry. 1 
CONTENTS. 
Page. 
Objects of the experiments 1 
Description of the Woodward Field Station. . 2 
Location 2 
Soil 2 
Climatic conditions 3 
Classification of the grain sorghums 12 
Experimental methods 14 
Size and arrangement of plats 14 
Crop rotation 14 
Method of seeding 14 
Methods of obtaining data 14 
Environing conditions 15 
Varietal experiments 16 
The milo-durra group 17 
The kafir group 23 
The kaoliang group 30 
The shallu group 33 
Page. 
Varietal experiments — Continued. 
Miscellaneous sorghums 33 
Comparative yields of the grain sor- 
ghums 35 
Date-of-seeding experiments 36 
Dwarf Yellow milo 39 
Sunrise kafir 44 
Dawn kafir 46 
Reed kafir 47 
Feterita 48 
Blackhull kaoliang 49 
Comparative yields in date-of-seeding 
experiments 49 
Spacing experiments 52 
Dwarf Yellow milo 53 
Sunrise kafir 59 
Summary 64 
OBJECTS OF THE EXPERIMENTS. 
Grain-sorghum experiments have been conducted at the Woodward 
Field Station in Oklahoma since its establishment in 1914. This 
bulletin presents the data obtained from varietal, date-of-seeding, and 
spacing experiments with grain sorghums during the eight years from 
1914 to 1921, inclusive. 
Climatic factors are recognized to be the determining influence in 
the agriculture of the Great Plains area, the southern part of which 
may be considered as the grain-sorghum belt. It is because of the 
adaptability of the sorghums to droughty conditions that they are 
so extensively grown in the southern Great Plains. The objects of 
the experiments herein described were (1) to determine the response 
of the different varieties of grain sorghums to the climatic and other 
environing conditions and (2) to determine the behavior of the prin- 
cipal varieties of grain sorghums when certain factors under control 
of the grower were varied. 
1 This manuscript was submitted for publication March 10, 1923. 
The writer desires to acknowledge his indebtedness to E. F. Chilcott, superintendent of the Woodward 
Field Station, for cooperation in providing every faci'ity for the conduct of the experiments here reported 
and for many valuable suggestions. 
49019— 23— Bull. 1175- 
