16 BULLETIN 595, U. S. 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. 
Samba Yield per acre (bushels). 
Treatment and previous crop. of plats 
‘yaveraged.|  j913 1914 1915 1916 | Average. 
Early fall plowed: Winter wheat.......-.-. 1 Oi 2 @) 29.2 29.8 19.7 
Late fall plowed: Winter wheat.........-- 1 Oo) (2) 30.0 27.0 19.0 
Listed: Winter wheat..........----------- 1 0 (@) 25.0 34.0 19.7 
Subsoiled: Winter wheat............------ 1 0 (@) 33.3 34.5 22.6 
MPASKOM COMME mace Se oie sae are cists aie aie Sheree 3 0 (2) 36.4 30.1 22.2 
Green manured: 
WARM OS Stes an ths acn scott eee 1 0 (2) 30.2 33.5 21.2 
Vii TREES... 45 SseosS sone ccadeseseseos 1 0 (2) 30.8 31.3 20.7 
Total or average...-...-------------- 2, Os aeseea- eee 30.5 32.4 21.0 
Sumumnentilledesoe see eee ce ae 3 d8.0 (2) 37.0 31.6 25.5 
Average of all 12 plats. ..---....-.-.-.-----|-.-------- GILG) lescsosesss 33.2 31.3 22.0 
SUMMARY OF YIELDS AND DIGEST OF Cost. 
Tillage treatment. Previous crop. 
Yields, values, etc. Early | Late Green | Sum- = 
(average per acre). fall fall | Listed Bie Diskea | _™2 mer Wanies Corn 
plowed plowed i ) a 3B muted tilled (4 (3 
1 1 pla 2 (3 plats) 
: plat). | plat). Plat). | plats). | plats). | plats). | Plats). 
0 0 0 0 0 0 bg, 0 0 
(2) (2) (2) (2) (2) (2) (2) (2) (2) 
29. 2 30.0 25.0 33.3 36. 4 30.5 37.0 29.4 36.4 
29.8 27.0 34.0 34.5 30.1 32.4 31.6 31.3 30.1 
AVOXALO : 0 coacceee ene 19.7 19.0 19.7 22.6 22.2 21.0 25.5 20. 2 22.2 
Crop value, cost, etc.: 
Wale). 2 So Eero ae eke $13.79 | $13.30 | $13.79 | $15.82 | $15.54 | $14.70 | $17.85 |.-.....-|--...--- 
WOSis a sene. aoe Doe epee: 6.32 5.65 5.03 7.03 4°25) | nal 3390) | gelOs G45 eee 8 | eae eee 
Profithe< ohare setae 7.47 7.65 8. 76 8.79 | 11.29 .74 ADO) erin ce Siegel ae 
a Destroyed by hail. b Two plats in 1913. ¢ Eleven plats in 1913. 
SCOTTSBLUFF FIELD STATION. 
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 
