56 BULLETIN 1173, U. S. DEPARTMENT OF AGRICULTURE. 
In interpreting these data it must be borne in mind that. con- 
clusions based on them are applicable only to conditions similar to 
those prevailing during the period of these experiments. In the 
fall of 1918 and in 1919 the seed either remained dormant in the 
dry soil to be germinated at a later date or it was seeded at the 
later date under conditions where the soil, even at the shallow depth, 
remained moist after seeding. For such conditions the most shallow 
seeding was best. In the fall of 1920, on the other hand, there 
‘was some early moisture, followed later by dry weather. In this 
case the deeper seeding was best even on the early date. The 
best depth of seeding, therefore, must be determined by conditions. 
TABLE 40.—Annual yields and stands per acre of Turkey wheat sown on three different 
dates in a depth-of-seeding experiment at Lind, Wash., in.the years 1919 to 1921, 
inclusive. 
Stands (plants per acre) and yields per acre. 
1919 1920 1921 
Time and depth of seeding. 
Stand. | Bushels.| Stand. | Bushels.| Stand. | Bushels. 
ie er | | : Set 
Early date: 
IE T1a\ 6) GUE Se ae a ee ta ap ee Oe CaS OE | 220, 000 15.8 128, 000 9.2 624, 000 12.1 
Dpiriches. 2s. . 44a tet eee ee 122.000 13.7 | 76,000 6.5 | 756,000 11.9 
ponchos ee Ta eet ae 64, 000 9.0 53,000 5.0 | 819,000 12.2 
Midseason date: 
Winch =. oe. ee. we 380, 000 16.9 | 164,000 9.8 804,000 10.8 
Dinch es a8 ee Lier ae | 237,000 16.2| 93,000 7.0 | 844,000 11.7 
ABC Hesse ce tees bh kia luce 166, 000 12.6 | 83,000 6.1 | 751,000 LL. 
Late date: | : 
Lib aKel yee Se Ne sane me eld ia GS YS ee 8 eae ees 375, 000 13.9 180, 000 10.5 | 999,000 ileal 
Brimcics eos a eas Te 358, 000 12.6 | 135,000 9.9 | 901,000 10. 7 
UO! CLAV ES Seats alg gh SI a dh LR RR gy: | 289, 000 | 13.9 | 147,000 8.8 | 852,000 10.8 
> 
SPRING WHEAT. 
Conditions prevailing at the time spring wheat is sown differ 
somewhat from those found in the fall when winter wheat is seeded. 
In the spring the soil is moist, but if the season be dry it may tend 
to dry more or less rapidly from the surface downward. Data on 
depth-of-seeding experiments with spring wheat are given in Table 41. 
TaBLE 41.—Annual and average yields of Early Baart spring wheat in depth-of-seeding 
experiments at Lind, Wash., in the years 1917 to 1921, inclusive. 
Annual and average yields per acre (bushels). 
Depth of seeding. Se aT aa Tees 
1917, ep eAgi8 1919 1920 1921 | Average. 
SSS | 
ny Sr Cs | 9.4 | 5.3 9.7 9.6 7.8 8.4 
apogee |. oS ee ge 9.4 | 6.2 10.4 | 10.6 8.7 9.1 
ATTA OVES 5s es ee ce ene et 9.9 | 6.4 11.2 | 10.5 9.1 9.4 
These data are distinctly in favor of the deepest seeding. In a 
season when precipitation is comparatively abundant at the time of 
seeding, as in 1917, the most shallow seeding may be practically equal 
to that at the greater depths, but for the drier conditions, on the 
average, the deep seeding is preferable for spring wheat. 
