ROTATION AND CULTURAL METHODS AT EDGELEY, N. DAK. 21 
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Fig. 4. — Diagram showing the data presented in Table II. 'The upper part of the fig- 
ure gives the yield of oats on fallow in rotation No. 8 and following wheat in rota- 
tion No. 5 for the years 1907 to 1919. The lower portion shows the yield of wheat 
on fallow in rotation No. 5 and following oats in rotation No. 8. In each part of 
the diagram the yields on fallow are shown by circles connected by a solid line 
and the yields following a grain crop by crosses connected by a broken line. 
