WHEAT PRODUCTION ON DRY LANDS. 5] 
SPACING EXPERIMENTS. 
RESULTS AT MORO. 
Experiments to determine the effect on yield of sowing wheat in 
- rows spaced different distances apart were conducted at Moro with 
spring and with winter wheat. Table 42 shows the yields obtained 
from sowing Turkey winter wheat in rows 7 and 14 inches apart in 
the years 1917 to 1921, inclusive. Duplicate sowings on twentieth- 
acre plats were made in each of these years except 1919, when the 
experiment was repeated four times on twentieth-acre plats. Exactly 
the same quantity of seed was sown on each plat, the rows 14 inches 
apart having twice the quantity of seed per row as the rows 7 inches 
apart. Wheat sown thickly in the row usually emerges more quickly 
than wheat sown thinly. Thickly sown wheat also grows more 
rapidly when the plants are young. It will be noted from Table 42 
that the average acre yield obtained from the 14-inch spacing is 2.5 
bushels less than that obtained from the 7-inch spacing. This differ- 
ence in yield undoubtedly is significant and indicates that maximum 
yields of winter wheat can not be obtained by sowing in rows spaced 
as widely as 14 inches apart. 
TaBLe 42.—Annwal, total, and average yields of Turkey winter wheat when sown in rows 
7 inches and 14 inches apart at Moro, Oreg., in the 5-year period from 1917 to 1921, 
inclusive. 
Annual, total, and average yields per acre (bushels). 
Spacings. ; 7 | 
1917 | 1918 1919 1929 | 1921 Total. | Average. 
— H _ 
o 375) ee 2.0, 23.0] 30.7 26.0|  36.7| 136.4 27.3 
aaa | 18.5] 20.5) 26.7 23.7| 34.8) 124.2 24.8 
In 1916 and 1917 an experiment was conducted to determine the 
effect on yield of spring wheat and winter wheat of sowing in rows 
4,6, and 8 inches apart. In 1916 wheat was sown also in paired rows 
6 inches apart, with a 24-inch spacing between the adjacent pairs. 
The experiment was conducted on small plats, 8 feet wide and 33 feet 
long. Duplicate plats were sown at each of three rates of seeding, 
namely 4, 5, and 6 pecks per acre, on each of the four different 
spacings. An equal quantity of seed was sown in each of the four 
ifferent spacings in eachrate. The yields obtained in 1916 from each 
plat are shown in Table 43. 
TaBLeE 43.— Yields of Pacific Bluestem spring wheat when sown at three different rates 
and at four different distances between rows at Moro, Oreg., in 1916. 
Yields per plat (pounds). 
| Single rows. | Paired rows, | 6 
F inches apart, 24 
Rate of seeding. . inch spacing be- 
[ 4inch spacing. | 6-inch spacing. 8-inch spacing. | tween pairs. 
ba Eee] <i pga 
| Series 1. | Series 2. Series1. Series 2. | Series1. Series 2. Series 1. | Series 2. 
nea | Seis oi ee ETE f E, | 
r | 
a | 7.00 8.50 | 8.00 11.50 7.50 | 5.00 | 5. 25 4.00 
Bpecks....-......... 10.25} 10.50) 9.25) 10.50 9. 50 8.75 4.50 4.00 
ee 10. 00 14.00. | 9.50], -9.00 8.50 | 8.50 | 4. 50 4.50 
Average........ 9. 54 | 9. 62 7.96 4. 46 
