ne geome 
——— ors 
oss a 
0 telete 
WHEAT PRODUCTION ON DRY LANDS. 27 
TasLe 13.—Annual and average yields of Turkey winter wheat, after fall plowing ané 
after spring plowing at different times, represented by different stages in the growth 
of volunteer wheat, at Nephi, Utah, during the 6-year period from 1916 to 1921, in- 
clusive. 
| Yield per acre (bushels). 
Date of plowing. a al a ad Sl Gc sc 
1916 1917 1918 | 1919 1920 1921 Average. 
——— -——— - — — —j— —— | _ ~ 
Fall plowing: 
Wo RU 9 20. 0 23. 6 17.4 21.9) 25.5 38. 9 24.5 
Spring plowing: 
wo ie Re ee ees! 28. 8 16.3 22.1 26. 2 34.7 24, Z 
When volunteer wheat Waséincheshigh|) 16.1 219 15.6 16.5| 222 329 20. § 
When volunteer wheat wasl2incheshigh.| 15.6 22.6 15.7 17.6 19.0 30. 4 20. 2 
When plants were in early bloom.......-. | 12.6 21.0 10.1 12.9; 181 26. 8 16. 9 
When kernels were in milk stage........ eed ® 21.7 9.7 5.5] 18.1 27.7 15.4 
These two factors should be considered, but economy of production 
is of first importance. Usually the time between the first possible 
opportunity for spring plowing and the time the volunteer wheat is 
6 inches high is not more than two weeks, and sometimes less. With 
a large acreage left for spring plowing, a good part of the land can 
not be plowed before the volunteer wheat is 6 inches high, and it is 
not uncommon to see plowing done in summer when the wheat 
plants are in the milk stage, the last stage covered by the experiment. 
That it pays to work the land as early as possible in the spring is 
clearly indicated from the results shown in the table. 
In another experiment, reported later, to determine the influence 
on yield of different methods of handling summer fallow, a direct 
comparison was also obtained between the yields of winter wheat on 
ground plowed for fallow in the spring and in the fall. Yields are 
available for spring-plowed and fall-plowed fallow given ordinary 
cultivation during the years from 1910 to 1921, inclusive, and for 
spring-plowed and fall-plowed fallow given no cultivation and weeds 
hoed during the years from 1916 to 1921, inclusive. These data, to- 
gether with the data for the fall plowing and spring plowing in the 
experiment listed in Table 13, are shown in Table 14. 
TaBLe 14.—Annual and average yields of Turkey winter wheat grown on tenth-acre plats 
plowed in the fall and in the spring with fallow treated in various ways, at Nephi, Utah. 
during the 12-year period from 1910 to 1921, inclusive. 
Annual and average yields per acre (bushels). 
| 
| | | | | H 
| | | Avere 
Treatment. | | | age. 
1910/1911 1912 1913 1914 1915 1916 1917|1918 1919,1920|1921; | 
| pA ae 1910 1916 
| to | to 
| | =|: <|°, [19208923 
pan pout eg ert | 
| } j | 
Spring plowing, ordinary cultivation...... (14. 0133 0/22.0 5. 0/42. 8 31. 7/18. 3/31. 8|14. slo, 7/27. 5/38, 4:25. 2/25. 7 
all plowing, ordinary cultivation. ..-..../12.029.0,22.0) 4.0/45. 4.31, 3 19. 3/27. 8/16. 2/19. 3 27. 1/48. 0 25, 1/26. 3 
pans plowing, weeds hoed............... DBAS tes, PN Se aes era 19, 5/29, 2/13. 0/23. 0/27. 7/42. 2|....|25.§ 
0 EE ee ee ee ne pei ee pices Ge 117. §/31. 2/13. 2/21, 7/23. 8/45. 7)... .|25. 6 
117. 1/28. 8/16. 322. 1/26. 2/34. 7|....|24.2 
(20. 0/23. 6/17. 4 21. 9/25. 5) (24.5 
. | i a 
|25.2 
125. 5 
