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.) 
TABLE XV.— Yield and post 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 eo 
eet aver- | 1999 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | Aver 
aged. age. 
Early fall plowed: Winter 
Sey 8 Cavs ee ees oe yes ace lle 1 0| aH 0| aH 0} 10.0 8.3 0 3.1 
Late fall plowed: Winter 
wiheatia soho asec eee 1 0 H 0 H 0! 12.0 5.0 0 2.9 
Listed : Winter wheat...... 1 0 H 0 H Oy ee KOO ORCA aoe aoss 285 
Disked CORN Sassen sete ae 3 0 H 0 H O-|:eG eee Ee oe eee 0 
Green manured: 
Wiithurye se cack sisas coe 4 0 H 0 H Oey csie creel te ME See 0 
Wath peas Oseeer asec 4 0 H 0 H OF See asec e eaters 0 
Total or average......- Bo craters sie ofere ie ciaolf wretw-erere io | wrarararaterd | croteteretare |e cierereratat eters ieters | mererseeete 0 
Summer tilled.=2...--......- 2 0 H 0 H 0|¢13.1 |] ¢8.0 c0 SUE 
Average or alllGyplatse: 4 3|ns- Senn) Soe eerie ee ite os Sere ene el eee d11.3 | €7.2 e0 3.1 
SUMMARY OF YIELDS AND DIGEST OF COST. 
: Previous 
Tillage treatment. crop. 
Yields, values, etc. (average per 
acre). Early Late Disked Green Sums Winter 
fall fall | Listed (3 wheat | Corn (3 
plowed | plowed |(1 plat). lats). ured d (8 tilled (2 (3 plats). 
(1 plat). | (1 plat). Pp plats). | plats). | plats). 
zields of grain: 
QQ Mt ee ae sca bushels. - 0 0 0 0 0 0 0 0 
AQIO Me Ee es eT do. al H H H 181 H H H 
TU bs Lely os ae eee aes do.. 0 0 0 0 0 9 0 0 
1) PANS oa A eS eee ee do. . aH H H H H H H H 
TS) ba Ses eee arc anette do.. 0 0 0 0 0 0 0 0 
1 eS ae ete ee do.. 10.0 12.0 1050 t: soess>: ses 1331 WOME) aes ye 
LOND Renee eee Soe do.. 8.3 DOr lees wane cl sane ece sieesmeer 8.0 FiGsOu| eee eee 
LOL G2 SES SEES Ee eee do.. 0 On SES a Aaa et Soles wastee 0 y HS oases |e 
AVY CRA SOR Sy sae es Sees a Be Il 2.9 QS SELES ee eens 3.5 2.9 0 
Crop value, cost, etc.: 
AVCHD SRR eth Saree pees Se ee $2.17 $2.03 | $1.75 0 0 $2.45 |..... Apr eae 
COSt Ser oe on ee 6.32 5. 65 5.03 422511 13.96.) 2 1Ol 64 3| Bee eee | aeeeeeer 
NOM OTLOSSS essen ae —4.15 | —3.62 | —3.28 | —4.25 |—13.96 | —8.19 |........)........ 
a H= Destroyed by hail. d Four plats in 1914. 
bCowpeas grown from 1908 to 1910; field peas grown since 1910. ¢ Three plats in 1915 and 1916. 
c One plat in 1914, 1915, and 1916. f 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. 
