College of Agricultural Sciences

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.

The objectives of the USDA-ARS affiliated study were to determine whether growth, nutrient use, and storage components of ericaceous plants differ when grown in media amended with varying proportions of sphagnum peat or coir.

The objective of this study was the determine whether addition of vesicular-arbuscular mycorrhizal fungi (VAMF) inoculum into the growing medium of different Zephyranthes spp. alters aspect of flower production, bulb production, and bulb quality.

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.

A report on research conducted to determine 1) whether the addition of vesicular–arbuscular mycorrhizal fungi (VAMF) inoculum into the rooting substrate during cutting propagation increases rooting of hick’s yew and 2) how the quantity of VAMF inoculum influences the rooting of hick’s yew under nursery production conditions.

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.

This study focuses on early season changes in nitrogen (N) uptake and amino acid distribution at different root zone temperatures to test whether (1) temperature effects on N uptake are influenced by plant growth stage, and (2) changes in amino acid distribution are related to N uptake.

The objective of the study was to determine whether addition of vesticular-arbuscular mycorrhizal fungi (VAMF) inoculum into the rooting medium during cutting propagation would increase the quantity of rooting and the quality of rooted cuttings for different cultivars of miniature roses.

Field trials were conducted to assess the potential to modify the IAA concentration in roots, root growth responses, and plant survival by root application of plant growth regulators (PGRs) such as IBA, NAA, and ethylene, or alginate, a moisture retention material.

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.