Regulation Root Growth in Ericaceous Plant Propagation

Nursery Crops
USDA-ARS affiliated author discusses the relationship between rooting and tissue nitrogen and protein content of ericaceous plants. The information presented is based on investigations into hormonal and nutritional regulation of root growth during propagation of common ericaceous plants grown in Pacific Northwest nurseries.

Influence of Ectomycorrhizal Fungal Inoculation on Growth and Root IAA Concentrations of Transplanted Conifers

Nursery Crops
USDA-ARS affiliated researchers tested the hypothesis that: (1) IAA concentration of mycorrhizal conifer roots is influenced by the in vitro (IAA and ethylene) production capacity of their associated ectomycorrhizal fungi; and (2) increased concentrations of root IAA cause an increase in root growth resulting in improved seedling growth and survival.

A Systematic Approach to Diagnosing Plant Damage

Management
A comprehensive guide for determining the difference between nonliving and living causes of plant damage. The authors also provide a list of available references for identifing plant problems, references topics vary from general plant problem diagnosis to crop specific.

Ebb and Flow From an Engineer's Viewpoint

Irrigation
Agricultural engineering specialist affiliated with the University of Connecticut discusses the benefits of using an ebb and flow irrigation system in a greenhouse environment. Examples of crops successfully grown using the ebb and flow system are provided.

Effects of Spring Soil Nitrogen Application on Nitrogen Remobilization, Uptake, and Partitioning for New Growth in Almond Nursery Plants

Fertilizer
A study was conducted on almond trees to (1) determine whether soil N application alters N remobilization; (2) quantify the effects of soil N availability in the spring on N uptake, distribution, and new growth; and (3) determine the most efficient time for spring soil N applications.

Soil and Foliar Nitrogen Supply Affects the Composition of Nitrogen and Carbohydrates in Young Almond Trees

Fertilizer
The objectives of this study were to determine the chemical composition of nitrogen (N) and non-structural carbohydrates in response to different N supplies and the interaction between storage N and non-structural carbohydrates in young almond trees.

N Uptake, Soil Retention and Loss of Soil-Applied 15NH4 15NO3 in Young Fuji/M.26 Apple Trees with Different N Status

Nursery Crops
The purpose of research conducted on young apple (Malus domestica Borkh) trees was to determine the fate of soil applied nitrogen to young apple trees and the influence of tree nitrogen status on nitrogen uptake by young apple trees.

Nitrogen Mobilization, Nitrogen Uptake and Growth of Cuttings Obtained from Poplar Stock Plants Grown in Different N Regimes and Sprayed with Urea in Autumn

Nursery Crops
Research was conducted on poplar (Populus trichocarpa ×P. deltoides) cuttings to determine whether different weekly nitrogen fertigation regimes altered nitrogen mobilization, nitrogen uptake, and growth of cuttings.

Application of Ectomycorrhizal Fungi in Vegetative Propagation of Conifers

Plant Propagation
A report on the potential use of ectomycorrhizal fungi in vegetative conifer production to increase adventitious shoots and enhance root formation and/or subsequent root branching. The authors specifically discuss in vivo cutting production, in vitro organogenesis and somatic embryogenesis.

Changes in Cutting Composition During Early Stages of Adventitious Rooting of Miniature Rose Altered by Inoculation with Arbuscular Mycorrhizal Fungi

Plant propagation
USDA affiliated study conducted on miniature roses (Rosa L.) to determine if components of arbuscular mycorrhizal fungi inoculum induced changes in adventitious rooting of miniature roses and the time frame in which the rooting changes occurred.

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