26 BULLETIN 595, U. S. DEPARTMENT OF AGRICULTURE. 
there were any profitable yields. When yields have been secured 
there have been no marked differences between the various methods. 
Drought and soil blowing in early spring have been the chief causes 
of failures and low yields. (Table XV.) 
TasLe XV.— Yield and cost of production of winter wheat by different methods at the 
Dalhart Field Station, 1909 to 1916, inclusive. 
Num- Yield per acre (bushels). 
Treatment and previous ae 
crop. aver- Aver- 
aged. 1909 | 1910 | 1911 1912 | 1913 | 1914 1915 1916 age. 
Early fall plowed: Winter 
FINO A ae eis ene attests ace 1 0; ¢H 0| aH 0} 10.0 8.3 O|e 3.1 
Late fall plowed: Winter 
wiheataic. saath a= o-c5 ne 1 0 H 0 H 0} 12.0 5.3 0 2.9 
Listed : Winter wheat. --..- 1 0 H 0 H ONE 1050) |Sae ese leee eee Oss 
MIske dics COMM estes wets aicciee 3 0 H 0 H (eee Peeosee paceore 0 
Green manured: 
Withinye)s-.---ssss5e 4 0 H 0 H i aGSnene| Boasocd| kK-cabn- 0 
With pease. 2-5-5225 4 H 0 H O)easecce|Seoscad Beado- 0 
Total or average...-.-- SSR Bess DeSean Socscad Seasoes poeacee Cseases Sseeosel secboce 0 
Summer tilled....--....---.- 2 0 H 0 H 0} ¢13.1] c8.0 c0 Sa 
Averagelonallel Gsplatssen as eee see | ae ene ee earl Beenie | (ate-)s eeeeee @11.3 | €7.2 e0 3.1 
SUMMARY OF YIELDS AND DIGEST OF Cost. 
2 Previous 
Tillage treatment. crop. 
Yields, values, etc. (average per 
acre). Early Late Disked Green | Sum- | Winter 
fall fall | Listed man- mer | wheat | Corn (3 
plowed | plowed |(4 plat). plats) ured (8 |tilled (2 (3 plats). 
(1 plat). | (1 plat). * | plats). | plats). | plats). 
Yields of grain: 
QOS SS: casa eteseceer bushels 0 0 0 0 0 0 0 0 
1OTORE ees sel veiee ters do.- al H H H H H H H 
TASS Tete eS eee oe rt do 0 0 0 0 0 0 0 0 
HOLDS Pee. ya 6 ETS do a H H H H H H H 
OT eo. ceisacea ess do 0 0 0 0 0 0 0 0 
LOMA cure ano) they Sarees See do 10.0 12.0 ORG RES arene Memeaeas 13.1 LOM | SE SERS 
1 Ke) ares te ame al do 8.3 DRS ye eRe Reece see asoraerc 8.0 iG Baeatace 
TOTG Ra EEE See sa do 0 Ody Ree aoe IE SEER PE eee es 0 FOV eS 
AvVerapes segs ere. SERIES NS. 3.1 2.9 25 (PEERS Ce SES. 3.5 2.9 0 
Crop value, cost, ete.: 
AUC ese ve ee ee emer maee $2.17 $2.03 | $1.75 0 0 $2540 tesa e ne |eieesce 
COSTAR eae NS ey 6.32 5.65 5.03 A251 3964) eh ONG40eeee cee. | eeceeeee 
ro fib OMlosSassaeeeeen nese —4.15 —3.62 | —3.28 | —4.25 |—13.96 | —8.19 |........|......-- 
a H=Destroyed by hail. d¥our plats in 1914. 
bCowpeas grown from 1908 to 1910; field peas grown since 1910. e¢ Three plats in 1915 and 1916. 
c One plat in 1914, 1915, and 1916. ft Two plats in 1915 and 1916. 
AMARILLO FIELD STATION. 
The soil at Amarillo, Tex., is a heavy clay silt. It is of the type 
locally known as “‘tight land” or ‘“‘short-grass land.’’ While the 
evidence is not as complete as could be desired, it appears that the 
storage of water and the development of the feeding roots of the crop 
are interfered with by a comparatively impervious layer of soil in 
the third foot. 
