WINTER WHEAT IN THE GREAT PLAINS AREA. 7 
and peas as green manure and by disked corn ground. ‘The average 
yield of 15.4 bushels per acre from disked corn ground 1s higher 
than that following any other harvested crop, but is 5.2 bushels 
less than on summer tillage and 0.7 bushel less than on rye as green 
manure. The yields after rye as a green-manure crop have been 
consistently higher than the yields after peas. Ground plowed 
early in the fall yields nearly twice as much on the average as ground 
plowed late, but only about three-fifths as much as disked corn ground. 
The results from listing and subsoiling are not sufficient for com- 
parison with the results obtained from other methods. (Table IX.) 
Tasre 1X — Yields and cost of production of winter wheat by different methods at the 
Scottsbluff Field Station, 1912 to 1916, inclusive. 
Yield hels). 
Neciber ield per acre (bushels) 
Treatment and previous crop. 0 S| EEE 
averaged.| j919 | i913 | 1914 | 1915 | 1916 | Average. 
Early fall plowed: Winter wheat........- 1 6.3 ead 17.8 8.7 5.2 9.1 
Late fall plowed: Winter wheat.......-..- 1 0 0 12.8 11.7 2.5 5.4 
Listed: Winter wheat..............--.--- 1 | Soeee lees alld Sooo eh Ales Shy 3.8 3.8 
Subsoiled: Winter wheat...............-- || Sas ee Portail alae Vaan 5.0 IB 7 
DiSked sy COrHee Sc ao a Be 3 15.6 10.5 18. 2 25.7 6.9 15.4 
Green manured: | 
IVVIGURT TY OS c eee en ke eee 1 14.0 9.0 26.7 23.8 7.0 16.1 
\IVAT Sy Oe She ee ee ee arene an ae 1 12.3 6.3 2a. or gn258 58 6.3 1251 
Potahoravyerage.- 0-3 32). s cock 2 13.2 Mell 25.0 | @23. 6.7 15.3 
Summenetilled ee soo) epssees 2 20.9 6.8 32.0 37.0 G32) 20.6 
Me prarcoielbiplits...6-4 0c ts. ss 1355 (oz 5 Lome old IGP 8.7 14.2 
SUMMARY OF YIELDS AND DIGEST OF CosT. 
Tillage treatment. ; Previous crop. 
| 
Yields, values, etc. Early | Late | Green | Sum- . 
(average per acre). fall fall | Listed S aren Disked| ma- mer AV iabce Corn 
plowed) plowed @! a (3 nured | tilled (4 
1 el plat) lat) plats). (2 (2 lats) plats). 
plat). | plat). P plats). | plats). | P’2')- 
(EE es ieee ||: 5 op oe 3 15.6 13.2 20.9 63.2 15.6 
Ondo) se eee 10.5 Ustl 6.8 63.9 10.5 
T2583 tere sees 22.3 18.2 25.0 32.0 | ¢ 17.6 18.2 
a Ay oe et COs 25.7 | @ 23.8 37.0 4.1 25.7 
2.5 3.8 5.0 6.9 6.7 6.2 8.0 6.9 
5.4 3.8 13.7 15.4 15.3 20.6 7.4 15.4 
| 
$3.78 | $2.66} $9.59 | $10.78 | $10.71 
5. 65 5.03 7.03 4,25 13. 96 
Profit or loss........... .05 | —1.87 | —2.37 2.56 6.53 | —3. 25 
a One plat in 1915. 6 Two plats in 1912 and 1913. ¢ Three platsin 1914. 
Disked corn ground has averaged the largest profit—$6.53 per 
acre. The next highest profit has been secured from summer tillage. 
Excepting subsoiling, since only two years’ results are available for 
9656°—17—Bull. 595——3 
