WINTER-WHEAT PRODUCTION AT FORT HAYS STATION. BW 
in relation to the differences in yield exhibited from the different 
rotations that for the purposes of the present bulletin only limited 
consideration and conclusions are warranted. 
TABLE 11.— Yields of wheat and kafir in rotations Nos. 501 to 510, inclusive, at the Fort 
Hays branch station for the 7-year period from 1914 to 1920, inclusive. 
Yields per acre for the 10 rotations (bushels). 
Year and crop. it r 
No. 501.|No. 502.|No. 503.|No. 504.|No. 505.|No. 506.|No. 507.|No. 508.|}No. 509.|No. 510. 
Wheat: 
NQUAR Ee a8 es 24. 8 24.3 25.5 26.8 26.8 26.7 26. 0 24.3 23.9 23.5 
1G eae el eae 14.9 Ieee 14. 4 12.5 13.9 Meal 14.9 14. 4 17.0 15.9 
BOLE re es es 38.8 32.9 3525 37.8 39.7 40.3 40.5 38. 7 BLA 33.2 
lel 3 LY Gob get ee 10. 2 14,3 15.0 12.3 14,4 14.6 16. 4 15y6) 15.3 11.1 
OTe eS le 6.9 10.8 10.1 i? us 12.4 12.3 12.9 19403 12.0 
POT See AS 3 10.9 10. 4 10.7 11.0 12.6 12.8 12.3 12.0 10.9 10.1 
TREY en i 37.5 39. 0 39.3 35.8 37.9 Ale W Bie ays i 37.5 33. 3 
AVC APE eis 20.6 20.7 NGA) 2 22. 6 21.6 22. 8 Diao Darel 19.9 
Kafir: 
PORES ea tre) 2.6 5.0 6. 4 5.9 5.8 6.6 6.9 8.1 4,8 4,6 
HOUG = es en 47.8 43.3 43.7 48.8 46.9 50. 2 35. 0 39.8 29.9 30.3 
OIG Ee oes 11.8 8.8 10.7 13.8 19.8 15. 8 iG‘ 7 10.6 7.9 2.6 
NO eee et 8.9 2.9 3. 4 Sy il 1S 1.8 1583 9 6 4 
POUR OSS AE 14,1 6.8 5.3 4,5 oa 3.9 4,8 Fast 35 7 Fh, 3 
TASC el ge SI oes 34. 5 31.6 32.3 BRS) 38.3 46. 6 35. 2 40.9 38. 4 28. 4 
O20 ee OF eo s° 78. 2 62.1 68. 5 68. 1 68.0 68.0 67.3 63. 1 47.6 38. 3 
ACV CLA GC esa sce 28. 3 22.9 24.3 25. 4 26. 3 27.6 | Paha) 235 19.0 115533 
Comparing the yields in rotations Nos. 501 and 502 with those 
from the other rotations it is very evident that neither the deep 
plowing of No. 501 nor the dynamiting of No. 502 has been effective 
in increasing the yields of wheat on the fallow receiving such treat- 
ment. The preparation of the wheat stubble for kafir on these plats 
is the same as in rotation No. 504. Comparing the yields of kafir in 
Nos. 501 and 502 with that in No. 504 especially and with the other 
rotations in general, there appears good basis for the conclusion that 
the deep tillage of No. 501 has some years extended its effect to the 
kafir crop and increased its yield. Special attention is directed to 
the yields in 1917, 1918, and 1920, when this effect was shown. By 
the same comparisons the aftereffect of the dynamite has been to de- 
press the yields of kafir the second year after its use. This may 
not be the correct interpretation, although the evidence to support it is 
nearly as strong as that indicating an increase from deep tillage. 
Passing over the other methods to the last two, it is evident from 
comparison of them with the others that the yield of kafir is increased 
by cultivation that prevents the growth of vegetation during the 
spring before planting. The double-disking in the spring which 
rotation No. 509 receives is not sufficient to do this, and a marked de- 
crease from the others is noted in its yield. A still further decrease 
is noted in the yield in rotation No. 510, which receives no cultiva- 
tion at all until it is planted with a lister. This method is sometimes 
