Total seedling weight, shoot weight and root weight in grams on an oven dry basis, root collar diameter in millimeters, and height in centimeters were used to develop an integrated index of seedling quality.

No abstract

An index based on combined morphological features of seedlings was used to relate seedling quality to different levels of nursery soil fertility as determined by soil and seedling analyses. Nutrient content on a per seedling basis was closely related to seedling quality.

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 fer-

A 70-year-old thinned northeastern Fagus-Betula-Acer stand in the Adirondack Mountains of New York was fertilized with varying combinations of N, P, K and lime. Acer saccharum Marsh. and Betula alleghaniensis Brit. foliage was collected periodically during the frost-free season and analyzed for foliage areas and weights, and levels of ash, N, P, K, Ca, Mg. Comparisons were made within species, and among treatments, expressed as concentrations on dry weight and ash bases, and as contents on per leaf weight and area bases. Elemental composition trends over time were examined to determine treatment effects and optimum sampling period.