BULLETIN 222, U. S. DEPARTMENT OF AGRICULTURE. 



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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 

 xaf/r,s.p.\ years are not considered 

 Aaf/nF/?.i in computing averages, 

 as the crops under all 

 methods alike were de- 

 stroyed. 



Figure 2 shows dia a- 

 gram of the dry-land 

 rotation field at the 

 Amarillo Field Station. 

 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. 



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, Fdl.= summer tilled, F.P.= 

 fall plowed, G. _W.= green manured, L.= listed, Af.= manured, 

 £. J\=spring plowed, S. <S.=subsoiled. 



