Topic: Forest Health

Showing 101 – 105 of 105 resources

Image-analyzing computer in plant science: more and larger vascular rays in sugar maples of high sap and sugar yield

The total area and number of xylem rays and vessels from tangential and cross sections of twigs of 12 sugar maples (Acer saccharum Marsh.) were determined by the use of an image-analyzing computer. A nested analysis of variance indicated that xylem rays of trees of high sap and sugar yield are more numerous and larger than the rays of other sugar maples. The total area and number of xylem vessels were about the same in all 12 trees.

Publication:
Canadian Journal of Botany
Date:
January 1, 1978

A Silviciltural Guide for Developing a Sugarbush

A practical guide for the management of a sugarbush. Guidelines are established for the manipulation of stand density and stocking to promote the development of healthy vigorous trees with deep, wide crowns, the necessary attributes for highest possible yield of sugar-rich sap.

Date:
January 1, 1974

Effects of Moisture and Fertilizers on Sugar Maple Seedling Growth

Two ways to help satisfy the need for more high-quality sugar maple trees (Acer saccharum Marsh.) are by establishing plantations and by supplementing natural regeneration. To gain basic knowledge of seedling requirements for this species we studied the effects of soil moisture and nutrient levels on the growth of sugar maple seedlings in their first 3 years.

Date:
January 1, 1973

Maturation of Sugar Maple Seed

The seeds of a sugar maple tree do not mature at the same time every year, and different trees mature their seeds and different times So time of year is not a reliable measure of when seeds are ripe. In recent studies we have found that moisture content and color are the best criteria for judging when sugar maple seeds are ripe.

Date:
January 1, 1971

A Guide to Sugarbush Stocking

Sugarbush managers have long needed a guide for determining the stocking of their sugar maple stands. The question is: for desirable sugar maple sap production, how many trees per acre are needed? To provide information about stocking, the USDA Forest Service’s sugar maple sap production project at Burlington, Vermont, has made a regionwide study of the relationships between crown diameter and d.b.h. (diameter breast high) of open-grown sugar maple trees (Acer saccharum Marsh.). We found a strong relationship between crown diameter and d.b.h., and converted these data into stocking guides for various stand-size classes. The stocking guide are based on the assumption that trees with full crowns produce the best sap yields.

Date:
March 3, 1970