138 
Journal of Agricultural Research 
Vol. VIII, No. 4 
SUMMARY 
(1) Nitrogen is the only fertilizer which in this experiment seemed to 
exercise a specific effect on the composition of oranges. 
(2) Applications of nitrogen to the soil resulted in a slightly lower 
amount of sugar, a somewhat coarser fruit, and a little less juice in the 
orange. 
(3) The effect of nitrogen was the same, whether applied alone, in 
combination with either potash or phosphoric acid, or both. 
(4) The effect of nitrogen was greater in 1915 than in 1914. As the 
crop was picked about two months later in 1915, it would indicate that 
some effect other than delayed maturity was caused by the nitrogen. 
(5) Comparison with fruit from similar trees grown outside the fer¬ 
tilizer plots shows a fair agreement of composition and quality. 
(6) The analyses show a higher percentage of nitrogen from all plots 
receiving it, while no such effect was obtained with either phosphoric 
acid or potash. 
LITERATURE CITED 
(1) Colby, G. E. 
1898. Effects of fertilization on citrus fruits. In Cal. Agr. Exp. Sta. Rpt. 
1895/97, p. 163-178. 
(2) COLLISON, S. E. 
1913. Influence of soil and fertilizer on citrus fruits. In Proc. 26th Ann. 
Meeting Fla. State Hort. Soc. 1913, p. 168-172, 3 pi. 
( 3 ) - 
1913. Sugar and acid in oranges and grapefruit. Fla. Agr. Exp. Sta. Bui. 115, 
23 P- 
(4) Hart, E. H. 
1897. Subtropical fruits. In Thomas, J. J. American Fruit Culturist . . . 
ed. 20, p. 557-623, fig. 785-796. N. Y. 
(5) Hilgard, E. W. 
1898. Results deducible from the above experiments [by G. E. Colby]. In 
Cal. Agr. Exp. Sta. Rpt. 1895/97, p. 178-181. 
(6) Rolfs, P. H. 
1906. Citrus fruit growing in tke Gulf states. U. S. Dept. Agr. Farmers’ Bui. 
238, 48 p., 17 fig. 
(7) Webber, H. J. 
1895. Fertilization of the soil as affecting the orange in health and disease. In 
U. S. Dept. Agr. Yearbook, 1894, p. 193-202, fig. 18-19. 
