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Effect of N, P, and K Fertilization on Yield and Sugar Content of Sap of Sugar Maple Trees¹

ABSTRACT

Sap yield, sap sugar concentration, and sugar yield data from sugar maple trees collected over 3 years revealed great intra- and interseasonal variations. The effect of N, P, and K fertilizers, applied singly and in combination, affected the yield of sugar by affecting sap yield and/or sap sugar concentration. The combination fertilizer depressed sugar yield the first sap flow season after treatment and increased this yield in the second season. The N or K fertilizer resulted in little change in sugar yield over the control trees while P fertilizer produced a significant effect on sap sugar concentration, thus affecting sugar yield.

¹ Contribution from the Department of Silviculture, State University College of Forestry at Syracuse University, Syracuse, N. Y. Presented before Div. V-A, Soil Science Society America, Nov. 29, 1961, at St. Louis, Mo.

² Research Assistant in Soils, University of Wisconsin, Madison; and Associate Professor of Silviculture, and Instructor in Forestry, State University College of Forestry at Syracuse University, respectively. Appreciation is expressed to Professor Shelley W. Potter who initiated this study.

Received for publication March 29, 1962. Accepted for publication October 26, 1962.