WINTER WHEAT IN THE GREAT PLAINS AREA. 11 
The yields obtained from deep plowing, deep plowing and sub- 
soiling, and the shallow plowing of winter-wheat stubble have shown 
only very small differences. Listing has averaged approximately 1 
bushel per acre less than plowing. The highest average yield from 
any of these methods is 6.1 bushels less than after green manure and 
7.4 bushels less than from summer tillage. During the three years 
that seeding on disked corn ground has been practiced the yields 
from this method have averaged 6.3 bushels higher than any of the 
other continuous-cropping methods used. 
Taste V.— Yields and cost of production of winter wheat by different methods at the 
Judith Basin Field Station, 1910 to 1916, inclusive. 
Num- Yield per acre (bushels). 
Treatment and previous aa 
te aver- | i910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | AVC 
aged. age. 
Deep fall plowed: Winter 
WiiGHi hoor ono sn SenEenanons 1 24.0 23.5 12.2 23.2 16.3 28.5 0 18.2 
Shallow fallplowed: Winter 
NW Caine ncteeiesisin sie Sines 1 23.8 22.0 13.2 25.5 16.3 25.0 0 18.0 
Listed: Winter wheat. ..-.-.- 1 Pil 22.3 10.8 24.3 20.1 21.1 0 17.2 
Subsoiled: Winter wheat.... if 23.2 22.4 12.5 26. 2 15.5 28. 0 18.3 
Disked: Corn.......-.------- ASE oS. .| 2 Re eee 22.5 38.1 0 20.2 
Green manured: | 
With rye....-- gooteccacs Sueseuease b 30.5 | 611.2 | 031.3 | ¢ 23.6 49.5 0 24.4 
Withipeas|. <2... Dil Sei sic eccll oeete 4. Saeeete eee eee d 23.1 50.5 0 24.5 
Total or average....... ON be Bae b 30.5 | 611.2) 631.3 | €23.5 49.9 0 24.4 
Summer tilled........-..---- 4 | #22.0|) £31.6| £17.5 | 731.8 25.5 51.5 0 PAR U 
Average ofall 17 plats.......'........ 22.9 25.4 12.9 27.1 21.0 42.1 0 21.6 
SUMMARY OF YIELDS AND DicEst or Cost. 
Tillage treatment. Previous crop. 
Yields, values, etc. (average | ca Shal- 
13) 9) Green | Sum- . 
per acre). fall ae Listed a Disked| ma- | mer Aviator Corn 
plowed lowed|( plat). (1 plat). (4plats).| nured | tilled (4plat (4plats). 
(i plat).| P (5plats).|(4plats).| 4P!@'s)- 
(i plat). 
viclds ot grain: 
OMNES Sees bushels. - 24.0 23.8 21.7 28}74 Gee badballooaeadcal) df Pea) PBs lide Saacee 
eH Bees peereecteces do... 23.5 22.0 22.3 Pee Nena soos 6 30.5 | f 31.6 228 0))| See 
TAS) PD ete tea ca ae do.. 12.2 13.2 10.8 1 Oats ee ees 611.2 | £ 17.5 122 pone 
UO ee serra do. . 23.2 25.5 24.3 PMG ?4 lGgaaasoe 631.3 | £31.8 ZA ia Lae 
NOAM epee re fase do. . 16.3 16.3 20.1 15.5 22.5 23.5 25.5 17.1 22.5 
TG) sys) hay aR Raat do.. 28.5 25.0 21.1 28.3 38. 1 49.7 51.5 25.7 38.1 
IW etseesoneeaes do.. 0 0 0 0 0 0 0 0 0 
Average. .-...-----.--- 18.2 18.0 17.2 18.3 20. 2 24.4 25.7 17.9 20.2 
Crop value, cost, etc.: 
Woaltte taser ee = kerma =e $12.74 | $12.76 | $12.04 | $12.81 | $14.14 | $17.08 | $17.99 |........|....._.. 
GOSH P es oe eeee 6.32 5. 65 5.03 7.03 4.25 13. 96 TONGA Seber ee | aes eee 
rofiteeeeo se eecisce <6 = 6.42 6.95 7.01 5.78 9.89 3.12 To8D locccsase | ae 
@ The failure of winter wheat in 1916 was due to winterkilling. 4 One plat of peas in 1914. 
6 One plat, 1911 to 1913, inclusive. e Three plats in 1914. 
c Two plats of rye in 1914, f One plat, 1910 to 1914, inclusive. 
