8 BULLETIN 10%, U. S. DEPARTMENT OF AGRICULTURE. 
The most valuable evidence perhaps is that from the oldest block 
of plats, which have a continuous record from 1906 to 1920, inclusive. 
There are 14 plats of winter wheat in this block. Four of these are 
cropped continuously to winter wheat by different methods, one is 
on fallow in a 2-year rotation (or alternation of wheat and fallow), 
seven are in 4-year rotations, and two are in 6-year rotations con- 
taining brome-erass or alfalfa. 
The land had been under cultivation for some years before the 
experimental work was started. The experiments being started in 
the spring of 1906, spring wheat was sown that year. Results with 
winter wheat are available for the 14 years from 1907 to 1920, in- 
clusive. The yields from the 14 plats and also the average yield of 
the county for each year of this period are given in Table 5. The 
j4-year averages are shown at the bottom of the table. 
TaBLe 5.— Yields of winter wheat in Ellis County, Kans., and in 14 plats at the Fort 
Hays branch station for the 14-year period from 1907 to 1920, inclusive. 
Yields per acre for the several plats and rotations (bushels). 
n ns x an ~ x“ x. ~ oD ¢ poe 
Continuous wheat. = ae | an Be S eS ae | 3 8 
: ° RS |B ss |/RBR Bs | Bs | Bs |] Bis 189 B 
Dee = |88/83|88|83|83|83/ 48 lbe | ot 
Ait! wen iesiatss ra EB) og =| wd | oA Si .cdi¢a | ead 
> |ltaleta| so Soo iret 2 |g He | ee | SB] SB lgo.|/as 
iS) Os Pe a rs “Ss Hae I a i=) Coes Oe es MS 2] so 
: S ee | HE 2 = o|/eo0}]e8 |} O27 | SS] SA] me) 5 aa S| So 
og (na| se) @ | 4 ae) S| Seles Ae ee es) ee eee 
S = ay |e “ ee Res i ~P am ~Pa | 25 aS IpRe| ao 
abel ala lel Ble cee Oe Sm Sey ee SSS 
1OOfs 5-2 9 Get S22|teold- 6) ol 2e4| = 02) 12: 5 9° 3| eats 253 ete |e oe Ole Oa9 7. 8| 8.8 
1908-55: 14 25.6] 23.3] 30.5] 28.1] 32.3) 29.2) 21.8! (0) 23. 21 OLA GLE eS itso. get 
1909 c. 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
1910... .< 13 20.5} 27.8) 39.8) 36.8) 42.5) 42.7) 22.5) 40.1 30.9) 39.3) 35.0) 29.5) 23.3) 25.1 
1911225. 2 0 ESl 23) 6s 2.6| . 5,2] ie 2) ge |. 92.816 928]. nal crn 
IQIQE=i-E 12 2aa|. Ada8| 2202112 20: Gl 295 21° 27.7 0 | 4.9} 13.2) 10.1 8.6} 13.9] 19.0) 12.9 
19ise= 6 S| 9. Qaal. - 4.50) 8541 1023/16. 4) 0-285 Zi Os 8| Sots seas Oh yol ie eo eee Ge 
1943522 19 20.6) 24.8) 25.3} 23.1) 21.6) 19.9): 19.8) 18.5) 23.5) 22.5) 21.4) 24. 0)°> 19.9) 6,7 
LOT. srs 11 9.3} 13.1]. 14.9} 13.9) 11.3] 17.5) 19.8) 22.3] 21.8) 20.4! 18.8) 20.7) 21.0) 19,7 
AOL TS: 13 8.7| 22.7) 27.6] 23.1) 33.8} 31:8] 28.8! 29.8) 33.8] 33.2) 31.5} 36.6) 34.8] 23.5 
1OIVeee 32 2 0 2.0) 9226) 0 Well aya G63 EE Pe | Sats) Ladi .3 Ba) pant 0 
AQISE SS t* 9 9.'7| 1439/5145 40 248) 8528) @12. 6) F457) ABA) P1250) 2 18S)" TOF 7) S6esal| aaa Sees 
1919... 9 17.9) 16.8) 18.9} 19.8) 10.0) 13.5) 14,6) 11.0) 13.7) 12.7) 20.6) 24.7] 21.8) 20.3 
1920-255. 18 19.9) 24.4) 26.0) 24.2) 37.0] 33.3) 30.9) 31.1} 32.6) 32.2) 27.8 37.7] 30.0] 29.1 
Avge 10.2) 10. 5 14.6] 17.0) 17.3) 20.3] 19.0) 13.4) 14.9) 16.5) 15.5) 14.0) 16.2) 15.0) 12.2 
a Plowed under for green manure. » Spring wheat by error. c All wheat on the plats destroyed by hail. 
CONTINUOUS AND ALTERNATE CROPPING TO WHEAT FOR 14 YEARS.4 
Of these 14 plats the greatest interest attaches to the four that are 
continuously cropped to wheat and the two on which wheat and fal- 
low alternate. These have no rotation number but are designated as 
A, B, E, and F, continuously cropped, and C and D, on which wheat 
and fallow alternate. Plats C and D are located between plats B and 
Kin the field. Plat A is late plowed and harrowed twice immedi- 
4 Since this manuscript was prepared the 1921 results have become available. They effect only minor 
changes in the averages and do not change the conclusions derived from them. The season was relatively 
unfavorable to wheat raised continuously without plowing, to late-fall plowing, and to wheat following 
eornand kafir. In the methods-of-fallow experiment the yield ofthe late-plowed plat in the pair N-O was 
relatively low and that ofthe listed plat in the pair P-Q was relatively high. 
‘| 
i 
5j 
i} 
