WINTEE-WHEAT PRODUCTIOlSr AT FORT HAYS STATION. 



27 



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 hafir in rotations Nos. 501 to 510, inclusive, at the Fort 

 Hays branch station for the 7-year period from 1914 to 1920, inclusive. 



Year and crop. 



Yields per acre for the 10 rotations (bushels). 



No. 501. 



No. 502. 



No. 503. 



No. 504. 



No. 505. 



No. 506. 



No. 507. 



No. 508. 



No. 509. 



No. 510. 



Wheat: 



1914 



24.8 

 14.9 

 38.8 

 10.2 

 6.9 

 10.9 

 37.5 



24.3 

 13.5 

 32.9 

 14.3 

 10.8 

 10.4 

 39.0 



25.5 

 14.4 

 35.5 

 15.0 

 10.1 

 10.7 

 39.3 



26.8 

 12.5 

 37.8 

 12.3 

 11.2 

 11.0 

 35.8 



26.8 

 13.9 

 39.7 

 14.4 

 12.8 

 12.6 

 37.9 



26.7 

 13.1 

 40.3 

 14.6 

 12.4 

 12.8 

 31.2 



26.0 

 14.9 

 40.5 

 16.4 

 12.3 

 12.3 

 37.2 



24.3 

 14.4 

 38.7 

 15.5 

 12.9 

 12.0 

 37.7 



23.9 

 17.0 

 37.7 

 15.3 

 12.3 

 10.9 

 37.5 



23.5 



1915 



15 9 



1916... 



33 2 



1917 



11 1 



1918.. 



12 



1919 



10 1 



1920 



33.3 







Average 



20.6 



20.7 



21.5 



21.1 



22.6 



21.6 



22.8 



22.2 



22.1 



19.9 



Kafir: 



1914 



2.6 

 47.8 

 11.8 



8.9 

 14.1 

 34.5 

 78.2 



5.0 

 43.3 

 8.8 

 2.9 

 6.8 

 31.6 

 62.1 



6.4 

 43.7 

 10.7 

 3.4 

 5.3 

 32.3 

 68.5 



5.9 

 48.8 

 13.8 

 3.1 

 4.5 

 33.5 

 68.1 



5.8 

 46.9 

 19.8 

 1.7 

 3.3 

 38.3 

 68.0 



6.6 

 50.2 

 15.8 

 1.8 

 3.9 

 46.6 

 68.0 



6.9 

 35.0 

 13.7 

 1.3 

 4.8 

 35.2 

 67.3 



8.1 



39.8 



10.6 



.9 



2.5 

 40.9 

 63.1 



4.8 

 29.9 



7.9 

 .6 



3.7 

 38.4 

 47.6 



4.6 



1915 



30 3 



1916 



2.6 



1917 



4 



1918 



2 7 



1919 



28 4 



1920 



38.3 







Average 



28.3 



22.9 



24.3 



25.4 



26.3 



27.6 



23.5 



23.7 



19.0 



15.3 



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 



