4Sb 



ANNUAL REPORT OF THE 



Off. Doc. 



THE INFLUENCE OF FERTILIZERS AND OTHER FACTORS 

 ON YIELD, COLOR, SIZE AND GROWTH IN APPLES 



DR. J. P. STEWART, Experimental Pomologist, State College. Pa. 



The Pennsylvania Experiment Station has been conducting experi- 

 ments bearing upon the above subject during the past five years. 

 Altogether, it has now in operation 18 such experiments, involving 

 soil types and 3,0G0 trees. In many respects, this series of experi- 

 ments is by far the most comprehensive of any similar series thus 

 far reported in America. In number of soil types; in number of 

 treatments and checks; in number, variety and range of age of 

 the trees; in duplications of the experiments of a given type; in the 

 amounts of fruit involved; and in the fact that the experiments are 

 distributed over the State and located, as a rule, in regions generally 

 recognized as being well adapted to apple production; in all these 

 res])ects we believe that the Pennsylvania orchard experiments en- 

 joy distinct advantages over most previous efforts to answer the 

 questions involved. 



The results considered in the present paper are chiefly from 10 

 experiments, containing 2,219 bearing trees and involving 10 differ- 

 ent tyi)es. The soil types range from heavy clay loams, in expt. 

 219, through silt and plain loams to light sandy and stony loams, in 

 expts. 216 and 219. Some of the general features of these experi- 

 ments are given in Table 1: 



TABLE L LOCATION, SOIL TYPES, VARIETIES AND TREES IN EX- 

 PERIMENTS AWAY FROM COLLEGE 





p. 

 W 



County 



Sou 



VarletieB 



to 



O 

 O 



2151 

 216 



220 

 217 

 218 

 219 



221 



336 

 3373 

 338 

 339 



Adams, 



Franklin, 



Bedford, 



Franklin, 



Franklin, 



Bedford, 



Wyoming, 



Chester, 



Mereer, 



Lawrence, 



Bradford. 



Porters loam, 



Montalto fine sandy 

 loan. i 



DeKalb stony loam, 



Montalto loam, 



Hagcrstown clay loam,. 

 Frankstown stony loam, 



Chenango line sandy 

 loam. j 



Chester loam, 



Volusia silt loam, 



Volusia silt loam, j 



Lackawanna silt loam,. 



York & Stayman, 



York & Jonathan, 



York & Baldwin, 



York & Gana, 



York & Albemarle, 



York, Jonathan, Ben 



Davis & Gana. 



Spy & Baldwin, 



Grimes, Smokehouse & 



Stayman. 

 Spy, Baldwin cfe Rome,... 



Baldwin, 



Baldwin & Fallwater 



13 

 12 



13&23 



18 



12&16 



9 



39 

 9 to 11 



4 

 23 

 17 



160 

 160 



160 

 858 

 400 

 320 



115 

 120 & 1053 



180 & 180 

 80 & 105 

 120 & 16 



1. The names and addresses of the owners of the orchards in which these experiments are located 

 are as follows: 215, Tyson Brothers, Flora Dale, Pa.; 216, D. M. Wertz, Quincy: 220, Mrs. S. B. 

 Brown, Manns Choice; 217, J. H. Ledy, Marion; 218, Ed. Nicodemus, Waynesboro: 219, J. H. 

 Sleek, New Paris; 221, F. H. Fassett, Meshoppen; 3.36, A. Darlington Strode, West Chester: 337, 

 A. M. Keifer, Greenville; 3.38, J. B. Johnston, New Wilmington; 339, F. T. Mynard, New 

 Albany. 



2. In the two sets of figures in this and the following experiments, the first gives the num- 

 ber of trees under fertilizer experiment, the second those under differing cultural methods. In 

 Experiment 339, the latter includes only a mulch plot. 



3. Trees set out in connection with these experiments and not yet In bearing, hence ex- 

 cluded from consideration at this time. 



