2012 Update on Christmas Tree Topics

Christmas tree specialist, Chal Landgren, gives an update of shipping and exporting issues, disease and pest management and current resources for growers.

Safe Procurement and Production Manual

Nursery crops

A systems approach for the production of healthy nursery stock. The manual, published by the Oregon Association of Nurseries, is divided into 3 main parts. A systems approach introduction, voluntary best practices for your nursery, and the next step: systems approach certification.

Feeding Bare-root Trees

Fertilizer

Researchers, extension agents and growers affiliated with Oregon State University provide fertilizer recommendations for growing bare-root shade, flowering and fruit trees in Oregon's northern Willamette Valley.

Seasonal Variation in Growth, Nitrogen Uptake and Allocation by Container-grown Evergreen and Deciduous Rhododendron Cultivars

Nursery Crops

The intent of the study was to expand current knowledge of nitrogen (N) uptake and allocation by container-grown Rhododendron by characterizing the plant growth, the extent of N uptake, and the changes in N storage that occur during the autumn and winter.

Phosphorus Supply Alters Tuber Composition, Flower Production, and Mycorrhizal Responsiveness of Container-Grown Hybrid Zandtedeschia

Geophyte
The purpose of this study was to determine if arbuscular mycorrhizal fungi (AMF) inoculation influences plant development, reproduction (vegetative and floral), and/ or tuber quality in calla lily (Zantedeschia spp. and hybrids).

Methods of Nitrogen Application in Summer Affects Plant Growth and Nitrogen Uptake in Autumn in Young Fuji/M.26 Apple Trees

Soil
The intent of this study was to determine the (1) effect of soil versus foliar nitrogen (N) applications during the summer on tree growth, and (2) effect of soil versus foliar N applications during summer on N uptake in the autumn in young apple trees.

Inoculation with Vesicular-Arbuscular Mycorrhizal Fungi and Rhizobacteria Alters Nutrient Allocation and Flowering of Harlequin Flower

Bulbs
The objectives of the study were to 1) determine whether addition of AMF inoculum into the growing medium of harlequin flower alters aspects of flower production, bulb production, and bulb quality, and 2) assess whether other rhizosphere organisms present in the AMF inoculum play a role in plant response to inoculation.

Root Damage Affects Nitrogen Uptake and Growth of Young Fuji/M.26 Apple Trees

Nursery Crops
Research was conducted with the intent of evaluating the effect of different levels of root damage at planting on nitrogen uptake and growth of bench-grafted young apple (Malus domestica Borkh 'Fuji'/M.26) nursery trees.

Inoculation with Arbuscular Mycorrhizal Fungi Alters Nutrient Allocation and Flowering of Freesia x hybrida

Geophytes
Study conducted to (1) determine whether addition of AMF inoculum into the growing medium of different Freesia x hybrida cultivars alters flower production, corm production, and corm chemical composition, and (2) to assess whether the other rhizosphere organisms present in the AMF inoculum play a role in plant response to inoculum.

Nitrogen Absorption, Translocation and Distribution From Urea Applied in Autumn to Leaves of Young Potted Apple (Malus domestica) Trees

Fertilizer
In this study, N-urea was used to assess uptake, translocation and distribution of nitrogen (N) from urea after application in the autumn to leaves of 1-year old bench grafted apple (Malus domestica Borkh) nursery trees.

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