Field Experiments in Manuring, 1903-4. 



687 



all the fields, as to the stronger operative effect of superphosphate, 

 are suppoi^ted, with very few exceptions, by the individual yields 

 throughout — the yields in 22 cases out of 27 being larger on the 

 superphosphate plot than on the Thomas phosphate. A comparison 

 of the two columns of figures will indicate the differences in favor of 

 superphosphate in each case. 



These figures alone are sufficiently regular and striking to warrant 

 the expression of an opinion in favor of the superiority of superphos- 

 phate on the great bulk of Southern soils. The fact, however, gains 

 further substantial confirmatory support from the comparison of 

 results obtained where tbe two fertilizers, in equal quantities, have 

 been applied with other manures. The following figures giving the 

 average returns of 27 fields will illustrate this : — 



Comparative Yields of Hay Produced by Superphosphate and 

 Thomas Phosphate Alone and in Combination. 



