GRAIN-SORGHUM EXPERIMENTS IN OKLAHOMA. 17 
cases varieties of no economic value have been continued, because 
of a constant demand for information regarding them. 
Results obtained from all selections, strains, and races of all the 
varieties under experiment in any or all of the eight years from 1914 
to 1921, inclusive, are presented in the tables that follow. The 
importance of a full presentation of the climatic factors has already 
been indicated; it is even more necessary to give full agronomic 
data which show the reaction of the varieties to the varying environing 
conditions. The data in the tables, therefore, include not only yields 
but many other agronomic data which show conditions of the experi- 
ments as well as the response of the varieties. These data include 
the row space occupied by each plant and stalk, the length in days 
of the vegetative and fruiting periods and of the total growing 
period, the extent of suckering, the height of the plants, the percentage 
of stalks headed, the percentage of seed in the total crop, and (in the 
milos) the percentage of erect heads. 
The date of seeding the varietal experiments has varied somewhat 
from year to year, the plan being to seed these experiments as near 
the middle of May as conditions permit. The dates of seeding 
these experiments in the several years are: 1914, May 11; 1915, 
May 26. reseeded on June 22; 1916, May 16 and 17; 1917, Mav 15; 
1918, May 14; 1919, May 19; 1920, May 19; and 1921, May 17 and 18. 
Each of the grain-sorghum groups is considered separately, a brief 
description of its distinguishing characters and a description of each 
variety included in these experiments being given. 
THE MILO-DURRA GROUP. 
The main characters which distinguish the milo-durra group from 
the other grain-sorghum groups are: Stems slender to midstout, dry 
and pithy, ripening with or before the seed; panicles short, broad, 
ovate or oval, short-branched, compact; seeds large. The varieties 
of this group represented in these experiments are milo, feterita, and 
White durra. Heads of several typical varieties of the milo-durra 
group are shown in Plate I, Figure 1. 
THE MILOS. 
Standard Yellow milo was the first milo introduced into the grain- 
sorghum belt. Later, a white-seeded variety appeared, which is the 
counterpart of the original milo except that the seed is white instead 
of orange yellow. A Dwarf Yellow milo has been in cultivation for 
about 15 years and has largely replaced the tall variety. The differ- 
ence between the standard and dwarf milos is mainly in stature. At 
Woodward, Old a., the height of standard and dwarf milos has 
averaged in the ratio of 3 to 2. During recent years a dwarf white 
milo has made its appearance. As before stated, color of seed is the 
only apparent difference between the yellow and white varieties. 
The orange-yellow color of milo is not objectionable, as this color is 
not associated with a bitter or astringent flavor as is the brown color 
of certain kaoliangs and sorgos. On the other hand, the orange- 
yellow grain of milo frequently brings a premium on the market 
when it is to be used in mixed poultry feed. 
At the beginning of these experiments three selections of Standard 
Yellow milo, one of Standard White milo, and three of Dwarf Yellow 
4 019— 23— Bull. 1175 3 
