150 



THIRD ANNUAL SESSIONS 



2. Yield of Oats on fall plowed land after Wheat. 



3. Yield of Oats on spring plowed land after Oats. 



4. Yield of Oats on fall plowed land after Oats. 



5. Yield of Oats on spring- plowed land after Corn. 



6. Blank, no Oats having been grown on fall plowed Corn ground. 



7. Yield of Oats on land disked but not plowed after Corn. 



8. Yield of Oats on fallow or summer tilled land. 



9. Yield of Oats on land which had Rye plowed under for green manure. 



10. Yield of Oats on land which had Peas plowed under for green manure. 



11. Yield of Oats on land which had Sweet Clover plowed under for green manure. 



12. Yield of Oats on fall plowed land after Barley. 

 13 ^ield of Oats on fall plowed land after Flax. 



The lower half of this diagram show^s the same data for Wheat that the 

 ui-per half does for Oats. 



land in 1907, while spring plowed corn land gave 5.3 bushels more than 

 fall plowed oat land for 1908. The only marked exception in the yield of 

 wheat was that fall plowed corn land gave 0.6 bushels less than spring 

 plowed corn land in 1907, while in 1908 the fall plowed corn land gave 

 5 bushels more than spring plowed corn land. It will also be noticed 

 that the difference between fall and spring plowed oat land was much 

 greater for 1907 than for 1908, and also that while rye and peas plowed 

 Tinder for green manure gave much better results in 1908 than summer 

 fallow in 1908, in 1907, the results for summer fallow, rye plowed under 

 and peas plowed under, were all very nearly the same. One of the most 

 striking results in the wheat yields at this station is the utter failure 

 of summer fallow to produce any marked increase in the yield. 



"Diagram No. 4 (Page 151), gives the results of three years at High- 

 more, S. D. The broken I'ne represenits the results for 1906, the dotted 

 line for 1908 and the solid line for 1908. It will be noticed that the re- 

 sults of the different times of plowing and crop sequence in the frst 

 five columns for oats show almost exactly opposite results for 1906 and 

 1908, while the results for 1907 are roughly intermediate between these 

 two. 



Soil Irrigation. 



"The rotations containing rye, peas and sweet clover, plowed under 

 for green manure were not started in time to give results for 1906 but 

 for 1907 the yields for rye, peas and sweet clover, are all larger than 

 for fallow land, while in 1908 the yield on fallow land wa':; appreciably 

 greater than for any of the green manured plats. 



Soil Treatment. 



"The wheat yields for the three years at this station agree more 

 closely than do the other jields for the several years. It will be noticed 

 that in both the wheat and oat yields the relative effect of fall and 

 spring plowing following the wheat crop were reversed when a compari- 

 son is made of the results for 1907 and 1908. The yields of wheat on 

 the summer tilled plats are remarkably uniform for the past three' years, 

 being 29.9, 30, and 31.7 bushels, respectively. In 1907 the green manured 

 plats gave a slightly greater yield than the summer tilled plat, while in 

 1908 the summer tilled plat was slightly more than the green manured 

 plat. 



