Semester of Graduation

Spring 2025

Degree

Master of Science (MS)

Department

School of Plant, Environmental, and Soil Sciences

Document Type

Thesis

Abstract

Resource efficiency, particularly regarding mineral nutrients, is a critical factor in the long-term success of the nursery industry. Fertilizer release is controlled by water and temperature in container-grown ornamental nursery production systems. Thus, it was hypothesized that pragmatic management of substrate temperature and moisture could extend the longevity of controlled-release fertilizer (CRF) in a container system. This study was conducted to determine the effect of irrigation scheduling, container color, and stratified substrates on substrate temperature and the subsequent use and longevity of CRF in a crop production setting. ‘Limelight’ Hydrangea (Hydrangea paniculata) liners were planted in either black or white colored 3-gal containers and grouped in sixteen rows of 10 plants. Rows were subjected to a single or cyclic irrigation application, in which irrigation was split into three irrigations at three minutes daily. Hydrangeas grown in white containers with cyclic irrigation increased plant growth by up to 50% compared to those grown in black containers with single-application irrigation. Root health and fertilizer efficiency were improved with substrate temperature management strategies. The results from this thesis provide insight into the methods that growers can use to mitigate root zone temperatures to enhance crop growth and salability, increase fertilizer use and efficiency, and decrease phosphorus leaching from nursery containers.

Date

1-9-2025

Committee Chair

Fields, Jeb S.

Included in

Horticulture Commons

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