WINTER WHEAT IN THE GREAT PLAINS AREA. 19 
the dry-land agriculture rotations from summer tillage and early fall 
plowing of winter-wheat stubble for the years 1912 to 1916, inclusive, 
show an average yield for the 10 years of 30.6 bushels per acre from 
summer tillage and 15.3 bushels on early fall plowing. 
TABLE X.— Yields and cost of production of winter wheat by different methods at the 
North Platte Field Station, 1912 to 1916, incluswe. 
NaMIen Yield per acre (bushels). 
Treatment and previous crop. of plats | 
averaged. 
1912 1913 1914 1915 1916 | Average. 
Early fall plowed: 
Win tenes heater aon cna aeere ane ae 1 yl 3.8 4,7 39. 8 28.3 16.9 
Winter wheat (manured)...........-- 1 9.3 2.2 4.5 31.2 31.3 aa) 
Oatseseseescarle ccs SSP ae ee ee 1 10. 5 3.8 (A 42.5 23. 0 17.4 
Rotaloriayeragess ios). 24: ja--5u- 3 9.2 3.3 5. 5 37.8 27. 5 16. 7 
Late fall plowed: Winter wheat..........- 1 7.2 3.2 3.3 39. 7 23. 5 15.4 
Disked: 
Wantertwheat. soos 44s FAA Se ee 2 LEE 4.3 3.0 38. 0 26.3 14.6 
COTS ee asters se ae anys esl eased areia Alara 9 10.0 16.9 8.0 37.3 38. 4 2251. 
GCEIR SEER SHEER OR GEO conor site Seamerreracr 2 0 degli 3.3 42.6 12.4 13: 2 
TEGTIBIIOE SHES: 5 SE Ee Beene i ae ene ten 1 0 14.5 5 36. 3 33. 6 18.4 
LO UANOTAVeCLAL Creat pate oe caelice 14 6.6 13.5 6. 6 38. 0 32.6 19.5 
Green manured: 
AWWALU DUTY Oe aerate ate cera caceterewik art nvejerelsiciow 1 28. 2 24.0 8.3 18.3 34.3 22.6 
AIAN OLG OE SBR AC eco Napier iie means camate i 23.8 15.5 ile 2 25.3 25.3 20.3 
Motalkonaveragessss.. ae Soke oe 2 26. 0 19.8 10.0 21.8 29.8 2135 
Sumamnentiled ss lyse a Aah oa, Si Runioa 7 Relies nto mh ee sieraleeconon| 21.6 
INVETAL CON Alli 25 Plats sas els ches ce eoe cn sleedccccek 9.7 14. 4 7.3 35. 5 30. 9 19.6 
SUMMARY OF YIELDS AND DIGEST OF COST. 
Tillage treatment. Previous crop. 
Yield, values, etc. Early | Late Green | Sum- All aniter Pota- 
(average per acre). fall fall | Disked| ma- mer | small sigan Oats | Corn | toes 
plowed | plowed; (14 nured | tilled | grain (5 (9 (1 
3 @! plats). (2 (5 (8 lats) plats). | plats).| plat). 
plats). | plat). plats). | plats). | plats). PB ; 
wields or Brain: 
2....... bushels. . 9.2 7.2 6.6 26. 0 12.7 4,7 5. 4 3.0) |) L080 0 
1913. Bes donot: 3.3 3.2 13.5 19. 8 23.1 4.5 3.5 6.0 | 16.9 145 
OVA eso 25 oe do.. : 9. 5 3.3 6. 6 10.0 10. 1 4.0 3.7 4.6 8.0 7.5 
LOLS eeeee aaedOnezal) Ole 8 39. 7 38. 0 21.8 S17 39.3 30.3) | 142.5.) 37.3 36.3 
AQUGE See sees Osea. 21.5 23.5 32.6 29. 8 30. 0 22.9 27.1 15.9 | 38.4 33. 6 
AVGEALO Ss =. ass 2 G7 15. 4 19.5 21.5 21.6 15.1 15.47) 14.5) 22.1 18. 4 
Crop value, cost, ete.: cea pen one: 
BIUCE ys eet = SULTON PF eLO (Sy || ol oAaoon |p kon Oar lhe bese lic «aye =tstacesese|llessyeyai sre lure aya | [ee aire lay |fe ens e 
COSbisacscristeriesecwicie 6. 32 5. 65 4, 25 13. 96 LO GAN Sra oS eek Sane see at MR ie 0S Sere 
Profit. cisesesoseee 5. 37 5. 13 9. 40 1.09 ee otal EROS AS SG |S SEC eects eerie ae eescs 
ARCHER FIELD STATION. 
The work at the Archer station is on a very high upland. The 
soil is a uniform, medium-dark sandy loam, with some fine gravel 
distributed very evenly through it. At a depth of 3 to 6 feet the 
soil is underlain with a bed of gravel. Commonly a hardpan of 
