STATE POMOLOGICAL SOCIETY. 



59 



These applications were naturally designed at the beginning 

 of the experiments, before there was any definite experi- 

 mental 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 affected 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. 



Treatment. 



< o «W 



1 Check j 90 



2!Nitrogea and Phosphate I 528 



SiNitrogen and potash 237 



4;Check ! 446 



olPhosphate and potash \ 57 



6 Complete fertlizer | 759 



7:Cheek 211 



8|Manure 278 



9: Lime (and fertlizer.) 558 



10 Check 106 



675 

 6018 

 5257 

 1932 

 3089 

 6621 

 2008 

 3531 

 1216 

 1266 



2575 

 3265 

 1822! 

 31681 

 3552 

 2108 

 1639 

 6149 

 3185 

 3505 



283 1024 

 7563 1225 

 7816: 696 



617;1382 

 1227!l385 

 8209 189 

 1362 1226 

 4874 6698 



388! 741 



106! 474 



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 



