16 BULLETIN 595, U. 8S. DEPARTMENT OF AGRICULTURE. 
TABLE VIII.— Yields and cost of production of winter wheat by different methods at the 
Ardmore Field Station, 1913 to 1916, inclusive. 
Yield per acre (bushels). 
Number 
Treatment and previous crop. | of plats l 
javeraged.| i9i3 | 1914 | 1915 1916 | Average. 
Early fall plowed: Winter wheat.......... 1 0 (a) 29.2 29.8 19.7 
Late fall plowed: Winter wheat........-.-- 1 0 (a) 30.0 27.0 19.0 
Listed: Winter. wheaticc 0 oe ee eee 1 0 (a) 25.0 34.0 19.7 
Subsoiled: Winter wheat...............--- ts 0 (a) Doc 34.5 22.6 
Disked (Corns. os cesses te ecm sess eee ee 3 0 a) 36. 4 30.1 WPA Ge 
Green manured: | | 
BWaEhirye hie ss ee See eee | 1 0 (ayes ee aan 33.5 21.2 
BVAth pPOass..0e 6 en eae ee | 1 0 (a) | 30.8 31.3 20.7 
Totalior averages - 24.22 4252 bee 2 EPP an ere Se ee 30.5 32.4 | 21.0 
Suitimier tilled. ---c. seve oe ee 3/-230| © 37, 0:1, S15 Sine eens 
Average of all 12 plats............0202-20-- | Ee Je L eeeeeeee. |) 233-2 31.3 | 22.0 
SUMMARY OF YIELDS AND DIGEST OF COST. 
Tillage treatment. Previous crop. 
Yields, values, etc. Early | Late | Sub | Green | Sum- | yw; 
(average per acre). fall fall | Listed | U0 ma- eT! Corn 
plowed plowed a is see Disked nured tillea | “eat Re 
1 1 plat). 2 (3 plats 
plat). | plat). | Plat). | plats). plats). | plats). | Plats). 
Yields of grain: 
AQIS SIs oes bushels 0 0 0 0 0 0 b8.0 0 0 
AQUA eee LE ae do.. (2) (2) (2) (2) (2) (2) (2) (2) (2) 
IOUS SS oes eS do.. 29.2 30.0 25.0 33.3 36.4 30:5 37.0 29.4 36.4 
AQIG: ooo cote was do 29.8 27.0 34.0 34.5 ]- 30.1 32.4 31.6 31.3 30.1 
IAVOTALS f2 Secu couscee= 19.7 19.0 19:7 | 22.6 22.2 21.0 25.5 20.2 22.2 
Crop value, cost, etc.: 
Value: 22 he ae $13.79 | $13.30 | $13.79 | $15.82 | $15.54 | $14.70 | $17.85 |.-.....-|-------- 
COStssSoscreeee Seems 6.32 5. 65 5.03] 7.03 4.25 | 13°96 |S 10. G45 | Bees os eee 
Profits eee 7.47 | 7.65| 8.76 | 8.79| 11.29 BL We met 7) ig ee fl x 
a Destroyed by hail. b Two plats in 1913. ¢ Eleven plats in 1913. 
SCOTTSBLUFF FIELD STATION. 3 
The work at Scottsbluff, Nebr., is conducted at a field station 
located on the North Platte Irrigation Project. The soil is a com- 
paratively light sandy loam. At a depth varying from 5 to 8 feet 
there is a sharp break from sandy loam to either sand or Brule clay. 
Above this point the soil offers no unusual resistance to the downward 
passage of water or to the development of roots. Owing to its light 
character, however, it is possible to store in it only a moderate sup- 
ply of available water. In respect to this point it is somewhere 
intermediate between the Belle Fourche and the North Platte soils. 
At the Scottsbluff station summer tillage has produced the highest 
average yield, though higher yields were produced in 1913 by early 
fall plowing, disked corn ground, and rye as green manure; in 1914 
by disked corn ground and rye as green manure, and in 1916 by rye 
