8 
BULLETIN 222, XT. S. DEPARTMENT OF AGRICULTURE. 
At each station at least one plat of barley is grown on summer- 
tilled land. The method of summer tillage practiced has been of the 
intensive type. The ground is fall plowed, and clean cultivation is 
continued through the next year and until the barley is seeded in the 
second spring. In some cases it is necessary to replow during the 
summer, when the land is fallow. At other stations summer-tilled 
plats are plowed but 
once. Experiments not 
here reported are under 
way to ascertain the best 
method of fallowing:. 
Indications are that 
equally good results can 
be obtained with a less 
intensive method than 
has been practiced. 
The yields given in 
these tables begin with 
the second year of crop 
production at each sta- 
tion. All crops are pro- 
duced the first year on 
land under uniform treat- 
ment. In some cases 
an entire crop has been 
lost by hail. These 
years are not considered 
in computing averages, 
as the crops under all 
methods alike were de- 
stroyed. 
2 shows dia a- 
the dry-land 
field at the 
Field Station. 
F 
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t<ar/r t /.:\ 
Fig. 2. — Diagram of the dry-land rotation field at the Amarillo 
Field Station. The lettering shows the cropping practiced in 
1914. The explanation of the abbreviations used after the name 
of a crop is as follows: D.= Disked, FaL= summer tilled, F.P.= 
fall plowed, G. M.= green manured, i.=listed, J/.=manured, 
5. P.=spring plowed, S. /S.=subsoiled. 
Figure 
gram of 
rotation 
Amarillo 
This station, being a representative one, will serve to illustrate the 
general scheme and plan of work. The plats here, as in all the 
work, are one-tenth acre in size. Their dimensions are 2 by 8 rods. 
Along their larger dimension the plats are separated by bare alleys 4 
feet in width. Along the ends of the plats they are separated by 
roads 20 feet wide. At this station five crops are represented in a 
series of continuously cropped plats lettered from A to F or G. In 
this group plats C and D are alternately cropped and summer tilled, 
so that each year a crop is grown on land that was summer tilled the 
previous year and a plat is summer tilled for cropping the next year. 
