°0 BULLETIN 595, U. S. DEPARTMENT OF AGRICULTURE, 
particles of fine sand cemented together is found overlying this 
bed of gravel. Water does not leach readily through this compact 
layer. 
The results from the Archer station are so meager that no definite 
conclusions can be drawn. In 1914 there was a total failure due to 
winterkilling under all methods, while in 1916 the stands on the 
disked corn ground and green-manure plats were destroyed by drift- 
ing soil from an adjacent field. Summer tillage has produced higher 
average yields than the continuous cropping methods for which three 
years’ results are available. The average yields from early fall 
plowing and late fall plowing are approximately equal and are slightly 
higher than the yields from listing and subsoiling. (Table XI.) 
TABLE XI.— Yields and cost of production of winter wheat by different methods at the 
Archer Field Station, 1914 to 1916, inclusive. 
| 
| Yield per acre (bushels). 
Number 
Treatment and previous crop. of plats 
averaged-| 4914 1915 | 1916 | Average. 
Early fall plowed: Winter wheat...................- 1 | 0 24.7 7.4 10.7 
Waterfall plowed: aWwanter- wheats. sseee aes ee 1 | 0 25.9 | 4.2 10.0 
MISTER sWih eatin. 5 5. sense ae een seen =a ih 0 21.2 | 5.4 8.9 
Subsoileds Waniter wheat tsa. sss sees secee = te oe 1 | 0 24.2 2.4 8.9 
DISKeE | COrm ees oe Cerca ee te as ea Ne Weta core 3 | 0 Ziel | (a) 13.6 
Green manured: | 
ATTIRE 2h SS a aon gr 9 Pa treet ame wel rr 1 |} 0 Paya ||. (@) PETE 
SWIG DOA. eee. Neer eta eens 1 ATS 8 es Re ee Ti 0 29.7 (a) 14.9 
Motalior averace® . 5 es ete es Oa erate 97. 5 ee 13.8 
Summiertilled2e. ts soe are as cra Sp ee ee eect eee 3 (0) 26 sAuiieee ce las: 12.6 
Averaccofallt2miatss ao aes eae nes ee eed | a dae | ees 26.0) 46.2 10.7 
SUMMARY OF YIELDS AND DIGEST OF Cost. 
Tillage treatment. Previous crop. 
Yields, values, etc. Early | Late | Green | Sum- . 
(average per acre). fall fall | Listed | pou Disked| ma- mer ae Corn 
plowed) plowed 1 al 3 nured | tilled (4 
1 1 plat). | lat) | plats). (2 (3 plats) plats). 
plat). | plat). | Peabe | plats). | plats) : 
Yields of grain: | 
OLA cp era. Shanes bushels. - 0 0 OSC 0 0 0 0 0 0 
1G) Ge eee ee ae dons 24.7 25.9 FA le? 24.2 Die: Zao 26.4 24.0 24.1 
LOGE eee do.. 7.4 4.2 5.4 | 2.4 (2) (a) ce 11.4 4.9 | _ (a) 
TANV CT AD Cae ere mre ec 10.7 10.0 8.9 8.9 13.6 13.8 12.6 9.6 13.6 
Crop value, cost, ete.: | | ‘ 
Walle stirs acme test eee $7.49 | $7.00 | $6.23 $6: 23) | | $9252) |» S$95669|"SS8582 cles eeeeeele eee 
Costti ste ee 6. 32 5. 65 5.03 7.03 4.25 13. 96 TOSG4: Roa ea oe 
Prontorlossese-ee ees USL? 1.35 1.20 | —0.80 5.20. | —4. 309) a 82s tee ee ees eee see 
a Stands destroyed by drifting soil in 1916. 
6 Two plats in 1914. 
ec One plat in 1916; stands on the others destroyed by drifting soil. 
d Five plats in 1916. 
Late fall plowing has been slightly more profitable than either 
early fall plowing or listing. Green manuring, summer tillage, and 
