College of Agricultural Sciences

The purpose of this study was to investigate the influence of water stress (as induced by irrigation frequency) on growth and nitrogen (N) uptake of one deciduous and two evergreen cultivars of Rhododendron grown with different rates of N fertilizer in containers.

The objectives of the study were to determine whether N availability alters 1) the uptake of other nutrients; 2) allocation of other nutrients among different plant structures; 3) ratios of N uptake to uptake of other nutrients (N uptake ratios); and 4) nutrient losses during the fall and winter.

In this study researchers evaluated the chicoric acid concentrations in dried and fresh basil (Ocimum basilicum) products available to consumers and how these concentrations compare to those from E. purpurea plant and products.

The specific objectives of the study were to determine whether susceptibility of field-grown pear trees to P. syringae is related to N concentration in stems and is altered by spraying trees with urea or the defoliant CuEDTA at different times in the autumn before and after inoculation with the pathogen.

Using green ash (Fraxinus pennsylvanica) trees as a model for fast-growing shade trees, the objective of this study was to determine whether N application rate and fertilizer type differentially influence cold tolerance of green ash.

The objectives of this study were to determine whether bud necrosis in green ash was associated with tree N status, and whether green ash trees containing the same amount of N from different types of fertilizer exhibited similar amounts of bud necrosis.

This study was conducted to 1) evaluate whether simple linear regression in combination with reflectance sensitivity analysis can be used to determine optimal wavelength (OW) for Chl assessment using reflectance; and 2) evaluate the importance of using OW in the development of Chl-related reflectance indices.

Research was conducted using evergreen and deciduous Rhododendron cultivars. The objectives of this research were to determine whether N-availability in the growing medium alters (A) the rate of uptake of other nutrients; (B) allocation of other nutrients between different plant structures; and (C) plant demand for other nutrients as reflected in ratios of N to other nutrients (N-ratios).

Deciduous and evergreen cultivars of container-grown Rhododendron were used to determine whether spraying plants with urea in the fall altered 1) uptake of nutrients other than N in the year of application and the following growing season; and 2) allocation of nutrients other than N in the year of application and the following growing season.

The purpose of this study was to determine: 1) how rate of N application during the vegetative stage of production influences plant growth; 2) whether plant N content before cold storage influences plant growth and flower development during forcing; and 3) whether urea sprays in the fall increase N storage before cold storage and plant growth and flower development during forcing.