38 
BULLETIN 1175, U. S. DEPARTMENT OF AGRICULTURE. 
Table 15 also shows data for the two sets of varietal plats sown 
in 1917, when the second seeding was made eight days after the first. 
The season of 1917 was very dry during July, and the sorghums prac- 
tically stopped growth until rains fell in August. A study of the data 
shows that the milos and feterita varied but little in grain yield for 
the two seedings, though there is a slight advantage in favor of the 
later seeded plats. On the other hand, the total crop yields are in 
favor of the earlier seeding. The kafirs produced decidedly higher 
grain and total crop yields from the first seeding, as did shallu, darso, 
and Schrock sorghum. The kaoliangs made better grain yields from 
the second seeding than from the first, though the total crop yields 
were in favor of the earlier seeding. 
From the foregoing data it is seen that quite different results may 
be obtained from the same variety when seeded at different dates. 
To studv the ef- 
<35 
/<?& 
f ects of time of seed- 
ing on the grain 
sorghums and to de- 
termine the best 
average date on 
which to seed them, 
date-of-seeding ex- 
periments with two 
varieties were 
started at the Wood- 
ward Field Station 
in 1917. The vari- 
eties used for these 
date-of-seeding ex- 
periments were 
Dwarf Yellow milo 
(C. I. No. 332) and 
Sunrise kafir (C. I. 
No. 472). Dwarf 
Yellow milo was se- 
lected as a t} 7 pical dwarf milo to represent the durra-milo group in 
these experiments. Sunrise kafir was selected as the representative 
of the kafir group because it had produced the highest grain yields 
among the kafirs in the varietal experiments. The earliness and 
total crop yields of Sunrise kafir also were considered. 
In a preliminary date-of-seeding test conducted in 1916 Dwarf 
Yellow milo and Sunrise kafir were sown on three dates at intervals 
of approximately two weeks. This experiment showed that one 
month did not cover the possible limits of seeding for these crops 
under the conditions at the Woodward Field Station. In 1917 more 
complete date-of-seeding experiments were started. The first or 
earliest sowing was made about the middle of April, followed by 
others at intervals of 14 or 15 days as nearly as conditions permitted 
until the last date, on or about July 1. The two varieties have been 
seeded on six different dates each year since 1917. Though it has 
been impossible because of weather conditions always to make a 
seeding on the exact date planned, this schedule has been followed 
closely, and the average dates of seeding during the several years are 
close to those planned. In view of the results obtained up to 1919, 
/9P/?/L/S AffiY/ MAY/5 J(/A/£/ J(JM£/5 JULY/ 
Fig. 5.— Diagram showing the relation of row space per plant and 
per stalk to the percentage of suckering for the different dates c f seed- 
ing of Dwarf Yellow milo, based on 5-year averages, 1917 to 1921, 
inclusive. 
