STATE POMOLOGICAL SOCIETY. 



59 



These applications were naturally designed at the beginning 

 of the experiments, before there was any definite experimental 

 evidence as to the most desirable proportions and amounts to 

 use. The amounts now advised for general use are shown 

 later. 



Results from the Johnston Orchard. 



The following table gives the yields obtained from the above 

 applications during the past 6 years. These results are ob- 

 tained from an experiment with Baldwins, now 25 years of age, 

 located on a Volusia silt loam in Lawrence county, north of 

 Pittsburg. On first inspection these trees did not seem to be 

 suffering especially from a lack of plant food, but they had 

 not been bearing satisfactorily and their annual twig growth 

 was averaging only about an inch, with occasional maximum 

 growths of 5 or 6 inches. These rates of growth are continu- 

 ing on the checks or unfertilized plats, but they have been 

 practically tripled on the plats receiving proper fertilization. 

 In estimating the influence of the treatments, the yields of the 

 first year are uniformly excluded because they can never be 

 materially aiifected by the applications of the first season. 



table il— influence of fertilization on yield. 

 (johnston orchard.) 



Yields in lbs. per plot and bu. per acre, 1908-1913. 



o 

 S 



Treatment. 



si 



o o ^ 



1 Check 



2 Nitrogen and Phosphate. 



3 Nitrogen and potash .... 



4 Check 



diphosphate and potash.. . 



6;Complete fertilizer 



7|Check 



SjManure 



9 Lime (and fertilizer) . . . . 



lO'Check 



348.7 

 287.4 



80.5 

 296.3 



370.8 

 14.3 



The average check has yielded 170.5 bushels per acre annually. 



The results in 1913 were very seriously interfered with by 

 the heavy frosts that occurred on May 11 and 12. The frost 

 effects were especially severe on plats 2, 3, and 6, as this was 



