WHEAT 107 



MIXED FARMING 



Such a system of farming compels the raising 

 of livestock to consume the forage, and this will 

 necessitate the building of silos and forage barns 

 to save the forage in large enough quantities so 

 that there will always be a reserve supply to tide 

 over a very dry season and thus make dry farming 

 permanent and sure. In the dry farming areas of 

 the Pacific slope and in the drier parts of the west- 

 ern plains and mountain states where dry farming 

 is practiced, alternate cropping and bare summer 

 fallowing seems to be as yet the most practical 

 method of maintaining crop yields. Perhaps 

 haps the future may develop green crops which 

 may be successfully used for green manure in these 

 dry areas in order to restore the decreasing soil 

 humus and organic matter. Under irrigation it 

 is possible to introduce one or more of the rota- 

 tion plans in use in humid climates, with perhaps 

 some variation in the kinds of crops. 



INFLUENCE OF CROP ROTATION ON WHEAT YIELDS 



The influence of individual crops in rotations 

 on succeeding wheat yields is shown by a long 

 series of experiments at the North Dakota exper- 

 ment station, in which wheat was grown after 

 each of several crops each year for three years in 

 succession in four year rotations, thus eliminating 

 the effect of seasons. As assistant agronomist 

 at the North Dakota experiment station the writer 

 had the privilege of conducting this work for 

 five years (1898 to 1902) and started this particu- 

 lar series of rotations. The results taken from 



