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  • 1 University of Maine, 5722 Deering Hall, Orono, ME 04469-5722

The effect of a fish hydrolyzate fertilizer product on growth of Acer rubrum and Pseudotsuga menzeisii was studied. Bare root plants were fertilized at a rate of 90, 180, and 270 kilograms of N/hectare. Soil samples were collected every two weeks throughout the summer and were analyzed for nutrient content. In addition, August leaf samples were collected and analyzed for N, P, and K content. Growth measurements on Acer rubrum indicate that stem caliper was significantly increased by all fertilizer treatments over the control trees. The granular fertilizer produced a significant linear increase in caliper growth with respect to fertilizer rate. Shoot growth was also significantly increased by all fertilizer treatments; however, as with caliper growth, the granular fertilizer treatments resulted in the greatest and most consistent response. The response of Pseudotsuga menzeisii showed significant increases in shoot growth and stem caliper but results were not as consistent as in the case of the maple.

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