OATS IN" THE GREAT PLAINS AREA. 7 



The plats here, as in all of 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. 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. 



The remainder of the field is in rotations in which each plat is 

 known by a rotation number and letter. On the field diagram the 

 separation of rotations is indicated by heavy lines. 



The movement of the crops is in the direction from Z to A and 

 from A back to the letter that marks the other end of the rotation. 



Pal/oiY. 

 P \ 



Oats, Pal. i 

 ■S g\ 



Wheat. 



m '\ 



Corn, 



"1 



Wheat, 



°A 



c *y. 



-1 



0ats, 



6M | 



p r ' 



,A | 



Oats, 



& 



"A 



c *y: 



«1 



tmeaf, 



«*.i 



forgha 



H 



W/iea 



■<vJ 



.&. C/o/er. I 



Oats, 

 o 



G.M. I 



Ctrfi, pp 



1 Corn, PP 1 | Corn, r.P. 1 



Corn, S.P. 

 p 



Com , S.P. 

 P 



pa How. 





Corn, P.P. 

 P 



Corn, PP. 

 P . 



a° 3,s -°-4 





Bar/ay, a \ 1 Oats, SP. 1 



oafs, S.P 



3 9 



Wheat. S.P 



B ' Z 



Wheat, Pal 

 B S 





Wheat O. 

 3 1 



Wheat, P.P. 

 a 3 



Meat, rfi 

 c 



Oats, PP 1 1 Barley, SP 1 



Wheat, s.p. 



Oats, s.p. 



Oats, PP. 





c Oats, P.P 



Oats, pp. 

 c 



Corn, SP. 



f?*** \U C °^ sp - 1 



Corn, SP 



meat, SP 

 p 



Oafs, SP 





Barley, SP. 



m'nterWheat, 

 P Pfi 



Wbtat.o. 

 S « 



3 IS II 3 31 \ 



Corn, PP. 

 8 



meat, PP. 



B ' 



Oats, PP. 





parley, PP. 



W. Wheat, pp. 



Peas, PP. 



c 



J Fallow. 



1 SCIo/er. I 



Corn, Pat 



c 



Wheat, Pal 



Oats, Pal. 





8ar/ey, Pal. 



W Wheat, Pal 



Oats, GAf. 





Oats, Pa/. 



oats, aM. 



D 





pa /to*. 



D 



patio*/. 



Fallow. 





Pa/low. 

 D 



Pallofi. 



Cor/7. SP 

 P ' 



Corn, s]P 



Corn, SP 

 P 





Corn, SS. 



£ 



Wheat, SS. 



Oars, SS. 



£ 





Barley, SS. 



w wheat, SS. 



Oats, A 



3 17 





Oats, 0. 



e • /8 



1 Oafs, 0. 1 



\3 32 1 



Corn, I. 



p ; ■ , m < 



Meat L 



f ■ ■ 



Oafs, I. 



p 





Barley, I. 



W.Whaet, J., 



Peas, PP. 



Pat/on: 



\ c s.c.^, , 



jSrome. 



* 



Pltalfa,FP. 

 p 



ffroma. 

 P 



Closer. 



Potatoes, SP. 



Wheat, 6m 

 A. 



meat, t/M 



[ Meat, 6M- j 



Arcme. 

 B 



H/Pa/fis. 



3 



Oats Sod. 

 3 





Oafa Sod. 



3 



Oats, d: 

 a 7S- 



Corn, S.P. 



P ' 



Jorgho/n, S.P. 



I Corn, SP 1 



£M.s°d. fi 



PI Pal Pn. 



Corn, SP 



Corn S P.' 

 C II 



PalloW. 

 c 



wheat a. 

 e ^ 7/. 



Oats, 0. 



3 34 



1 Oafs, A, 1 



Oats, PP. 



Oats Sod.. 



Wheat A 

 





. Whr-at, 0. 



Wheat, Pal. 



Fallow, At. 



J.CIo/er 



c 



1 Fallow, d \ 



Corn, SP. 



Corn, SP. 



Brome. 



Closer. 



Potatoes, SP~ 

 P 



Oafs, Fat. 



wheat, 6.M. 



\ Wheat, Pal. j 



■ meat, O. 



Wheal, D. 

 P 







Oats, Pal 



Meat, D. 



B 76 























Fallon, M. 



c 



Fig. 2.— Diagram of the dry-land rotation field at the Belle Fourche Field Station. The lettering shows 

 the cropping practiced in 1914. The explanation of abbreviations used after the name of a crop is as 

 follows: D.= Disked, J PaZ.=summer tilled, F. P.=fall plowed, G. M.= green manured, i.^listed, M .= 

 manured, 8. P.=spring plowed, S. ( S'.=subsoiled. 



In figure 2 the diagram is filled out to show the cropping in 1914. 

 The letters following the crop indicate the treatment given the 

 ground in preparation for it, S. P. standing for spring plowed, F. P. 

 for fall plowed, Fal. for summer tilled, G. M. for green manured, 

 and D. for disked. The addition of the letter M. indicates the use of 

 manure. 



To illustrate: In 1914 plat A of the 4-year rotation No. 14 was in 

 corn on spring-plowed ground, plat B was in wheat on disked corn 

 ground, and plat C was in winter rye on fall-plowed land. This 

 would be plowed under for green manure. Plat D was in oats where 

 winter rye had been turned under the year before. In 1915 A will 

 be in wheat, B in winter rye, C in oats, and D in corn. 



Some of the rotations are calculated to conserve or increase the 

 fertility of the soil, while others may perhaps deplete it. In the 

 present stage of the work the effects of rotations as units are greatly 

 87674°— Bull. 218—15—2 



