Moderate shaking of Liquidambar trunks for 30 seconds daily reduced height growth to only 20 to 30 percent of that of trees not shaken. Six of eight trees shaken set terminal buds within 3 weeks. The trees which were not shaken formed no terminal buds. An endogenous mechanism for regulating tree growth in windy situations is implicated.
and second, there is a twofold difference We do not feel that we have confounded age with location in our studies. As we said, "we studied two adjacent abandoned hayfields," and "macroclimate and soil series are identical." Both fields were planted in timothy (Phleum pratense) and are slowly decaying into "natural" ecosystems characteristic of upstate New York. Since timothy is hardly a species characteristic of impoverished sites (1), we assume that whatever impoverishment leads to invasion of Poa compresa and Hieraciuim pratense arises out of the successional aging process. We have extensive soil data on the two fields as well as a description of their previous land usage from the land's owner. These data could not be included in a report in Science.
We tested the efficacy of treeshelters on selected containergrown trees in the nursery and on redwood seedlings transplanted into the landscape. Treeshelters accelerated shoot growth of southern magnolia, holly oak and deodar cedar, but root growth was reduced during the first growing season as compared to the controls. Sufficient shoot-root development of the trees was achieved only after two growing seasons. One-year-old redwood seedlings successfully established themselves whether grown in treeshelters or not, while receiving 1/7 to 1/14 as much water as they would in a nursery bed grown in one-gallon containers. The seedlings in treeshelters grew significantly taller. Despite innovative developments in propagating, growing and replanting container-grown ornamentals in-the nursery, production costs remain high. Nursery managers, therefore, tend to grow only plants that perform reliably in containers and reach marketable size quickly. Furthermore, when transplanted to the landscape, ornamentals require several costly operations to be established successfully: site preparation, proper planting techniques, weed control, staking, protection from animal browsing and vandalism, and application of pesticides, fertilizers and irrigation. Treeshelters (cylindrical polypropylene tubes about 10 cm, or 4 inches, in diameter and of varying heights) have been broadly used in Great Britain and other countries to cut costs of establishing small (25-to 30
Pruning and staking can be effectively used to develop structurally stable trees. The growth of young trees can be directed by pruning branches that are in unwanted permanent positions. Staking should be used primarily to protect and anchor young trees; support staking should be used only when plants are not able to stand upright without support.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.