of the farmers themselves. It should, of course, be borne in mind that 

 the above results are obtained with soil from a field which has a certain 

 past history, and that the same type of soil from another field with a 

 past history widely different from this might give results considerably 

 at variance with it. As a rule, however, the conditions which prevail 

 on a soil type of a certain locality are fairly uniform, there being a rela- 

 tively small number of farmers that deviate from the general farming 

 practices of the neighborhood. 



It should be understood also that the conditions encountered in farm 

 practice are different from those maintained in these experiments. The 

 treatments when put to a field test might prove more or less effective, 

 or, owing to excessive rainfall or drought, might fail entirely. Further- 

 more, the wheat plant has been used as the test of fertility in these 

 experiments, and whether it is a safe indicator for cotton and other 

 crops has not been determined. It is generally conceded, however, that 

 if a soil will produce a good crop of wheat it will produce good yields 

 of general farm crops. 



Arrangements have been made to confirm the above results by actual 

 field tests on the field from which the above soil was taken. 



F. D. GARDNER, 

 In Charge of Soil Management. 



F. E. BONSTEEL, 



Approved : Assistant. 



JAMES WILSON, 



Secretary of Agriculture. 



AUGUST 1, 1905. 



O 



