152 



THIRD ANNUAL SESSIONS 



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



4. Yield of Oats on fall plowed land aftdr 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 Com. 



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 IBarley. 

 1l. Yield of Oats on fall plowed land after Flax. 



The lower half of this diagram shows the same data for Wheat that the 

 upper half does for Oats. 



North Platte Station. 



"Diagram No. 5 (Page 153), represents the yields of wtieat and oats at 

 Narth Platte, Neb., for the years 1907 and 1908, the broken line being the 

 yields for 1907 and the solid line for 1908. The results of the differ- 

 ent sequence and time of plowing upon the oat crop of 1907 was not 

 at all striking, the highest yield, 40.6 bushels, having been obtained from 

 the disked corn plat, the fallow plat giving 4.9 bushels less than the 

 disked corn plat. Both rye and peas "plowed under were less than either 

 the fallow plat or the disked corn plat. In 1908 very different results 

 were obtained. In fact, there is almost a complete reversal of the effects 

 of crop sequences as compared with 1907. :t will be noticed that fall 

 plowed wheat land gave 10.4 bushels more than spring plowed wheat land 

 in 1908, while in 1907 the fall plowed wheat land gave 5 bushels less 

 than the spring plowed wheat land. In 1908 the spring plowed oat land 

 gave 24 bushels less than the fall plowed wheat land, while in 1907 the 

 spring plowed oat land gave 0.6 bushels more than the fall plowed wheat 

 land. The difference between fall and spring plowed oat land in 1907 

 was 6 bushels, while in 1908 it was 34.1 bushels, fall plowing giving 

 better results in both instances. Spring plowed corn land gave 17.3 

 bushels less than fall plowed oat land in 1908 while in 1907 the differ- 

 ence was only 1.4 bushels. In 1907 the yield of oats on summer tilled 

 land was 4.9 bushels less than for disked corn land. Neither rye nor 

 peas plowed under for green manure gave as high yields as summer 

 tilled plats in either year. 



Soil Treatment. 



"The correspondence in the effects obtained from the different crop 

 sequence and times of plowing in the wheat yield of the two years, is 

 much closer than in those of oats. In fact, the only marked difference 

 being that in 1908 fall plowed corn land gave 4.7 bushels more than 

 spring plowed corn land, while in 1907 the spring plowed corn land gave 

 1.2 bushels more than fall plowed corn land. The yield of wheat, 41.4 

 bushels, upon the summer tilled plat in 1908 was the best average yield 

 of spring wheat obtained at any station for any year and was markedly 

 superior to that obtained from any of the other plats, although the fall 

 plowed oat land produced a yield of 29.9 bushels the same year. 



"I believe that the facts pointed out as shown by these diagrams 

 amply substantiate the statement made in the foregoing discussion con- 



