Treesearch

In forest nursery practice, the mechanism of phytopathogen suppression by soil saprophytes is used to protect seedlings against root rot. An important stage is the formation and maintenance of a microbial association which will provide extended inhibition of phytopathogen development and growth of healthy seedlings.

Hot water and sulfuric acid soaks are traditional treatments for seeds of many temperate woody legumes, including locusts. However, these scarification techniques often produce inconsistent germination. Percussion scarification, where seeds are repeatedly propelled against a hard surface, was compared with hot water scarification to evaluate treatment efficacy for New Mexico locust (Robinia neomexicana) and black locust (R. pseudoacacia) seeds. In the hot water treatment, seeds were placed in a 98° C water bath, which was immediately removed from the heat source. For percussion scarificatio...

This paper presents containerized forest nursery practices in Sweden. Containerized stock was introduced some 30 years ago in Swedish forestry. Since then, the use of this stock has been successively increased at the expense of bare-root stock. Last year, approximately 400 million containerized and 30 million bare-root seedlings were produced in Sweden.

Current production of forest seedlings in Venezuela totals more than 100 million plants per year. There are four large nurseries that account for more than 75% of the total production with several hundred small nurseries that account for the remainder. Major species used are pines, eucalyptus, mahogany, and numerous other native tree species. Limitations in forest nurseries in Venezuela include access to continued funding, improved seed availability and adequate nursery techniques to produce all of the desired species. Renewed interest in forest plantations in Venezuela has given rise to...

In mid-October 1999, I visited Inner Mongolia at the request of the Forestry and Agriculture Organization to evaluate nursery practices and afforestation programs designed to protect the soil and provide wood products. Inner Mongolia is a narrow region of northern China immediately south and east of the country of Mongolia. It stretches from east to west about 2,000 km, equivalent to the distance from Minnesota to western Wyoming. The predominant native vegetation type is grassland; existing forests are all man-made. I was headquartered in the town of Tongliao, near the eastern border of...

Successful consistent revegetation of drastically disturbed mine sites (in other words, acid coal spoils and mineral waste dumps) throughout the United States and several foreign countries has been achieved by using the biological "tools" - tree seedlings, native shrubs and grass species inoculated with mycorrhizal fungi. These trees and shrubs are custom-grown in bareroot and container nurseries with selected mycorrhizal fungi and grasses and forbs are inoculated in the field with pelletized spores of VAM fungi at the time of planting. On disturbed sites, specific mycorrhizae formed by...

Rocky Mountain juniper (Juniperus scopulorum Sarg.) seed are hard to germinate in the nursery, containers, or laboratory because they have multiple dormancies. The seedcoat and prophylactic sheath surrounding the embryo impede water absorption. The embryo's epicotyl is not dormant; only the hypocotyl displays dormancy and requires cold stratification.

Two series of trials were conducted in northern bareroot forest nurseries to determine: 1) the effects of different incorporation implements and two chemical application rates on the efficacy of dazomet fumigation; and 2) soil penetration resistance in the vertical soil profile following sub-soiling by two different implements. When target pests were located > 18 cm deep, the spading machine was more effective than three different rotary tillers in reducing fungi. Mortality and disease ratings in this trial were lowest and percentages of shippable seedlings highest for the spading machine...

The George O. White State Forest Nursery is owned and operated by the Missouri Department of Conservation. Our agency is responsible for the management of the fish, forest, and wildlife resources of the state.This paper will address the George O. White State Forest Nursery. It will discuss where we are, a little of our history, and our growing conditions. It will then demonstrate how we grow shrubs and small trees that Missouri landowners use for a variety of plantings.

Maintaining sufficient soil fertility in tree nurseries for good tree growth can be implemented by annually performing soil analyses and following a fertility maintenance program. Percentage recovery by trees of fertilizer applied indicates efficiency of fertilizer use. There is a wide variation in the recovery among the various fertilizer elements. Our research has shown that, of the primary nutrients, nitrogen recovery is much more variable, spanning from deficits to almost complete recovery. Low efficiency of nitrogen recovery is the usual rather than the exceptional occurrence. Soil...