210 



POMOLOGY 



lizer have averaged 90.3 bushels per acre, and only 69.1 bush- 

 els in the six corresponding cases without. Tillage, there- 

 fore, has increased the efficiency of the fertilization in most 

 cases. There were several important exceptions, however, 

 and tillage excesses, either in depth or frequency, may actu- 

 ally reduce the gains from fertilization." These conclu- 

 sions are supported with the following data: 



Table LXVII 

 ten-year summary of results in fertilizing tilled apple orchards 



(after STEWART) 



Treatment 



York, 



Stayman, 



Young orchard 



Ave. of checks 



Nitrogen and phosphorus 



Nitrogen and potash 



Phosphorus and muriate 



Phosphorus and sulfate 



Nitrogen, phosphorus, and potash. 



Nitrogen 



Manure 



225.7 

 279.1 

 350.4 

 292.4 

 293.4 

 298.5 

 236.8 

 304.2 



180. The Ohio experiments. — A discussion of these 

 experiments was included under the section on "untilled 

 orchards," since a comparative statement in that place 

 seemed more desirable. 



181. Results compared. — It is confusing to find such 

 contradictory statements from a similar type of experiment, 

 but the student should understand that it is the duty of the 

 experimenter to report faithfully the results of his work 

 without prejudice in regard to the results. When it becomes 

 evident that the worker is endeavoring to prove instead of 

 to find out something, the interpretation of his work is 

 weakened proportionately. 



