CHAPTER XXIV 



MINNESOTA SOIL INVESTIGATIONS 



BECAUSE they have been so widely quoted in the agricultural 

 press of the central West, and even in text-books on soils and fer- 

 tilizers, it seems especially important to give in some detail the re- 

 sults of field and laboratory experiments conducted by the Minne- 

 sota Agricultural Experiment Station since 1892. 



TABLE 105. MINNESOTA SOIL INVESTIGATIONS 

 (a) Crop Yields per Acre in Bushels or Tons 



(b) Nitrogen 2 in Soil per Acre 9 Inches Deep 



1 Evidently these loads of manure weighed 1200 Ib. each, making 9600 lb., 

 or less than 5 tons, per acre. C. G. H. 



2 Based upon the statement that .221 per cent of nitrogen is equivalent to 5400 

 lb. of nitrogen per acre. 



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