Influence of Nitrate:Ammonium Ratios on Growth and Elemental Concentration in Two Azalea Cultivars

Autor:	M. B. Clark, Joyce G. Latimer, Harry A. Mills, C. D. Robacker
Rok vydání:	2003
Předmět:	biology Physiology Chemistry Vegetative reproduction Ammonium nitrate biology.organism_classification Cutting chemistry.chemical_compound Horticulture Nitrate Rhododendron austrinum Botany Ammonium Agronomy and Crop Science Plant nutrition Azalea
Zdroj:	Journal of Plant Nutrition. 26:2503-2520
ISSN:	1532-4087 0190-4167
DOI:	10.1081/pln-120025475
Popis:	Rooted cuttings of Rhododendron canescens “Brook” and Rhododendron austrinum were grown in sand culture with a modified Hoagland's solution under greenhouse conditions. The effect of varying ammonium:nitrate (NO3 −:NH4 +) ratios (100:0, 75:25, 50:50, 25:75, 0:100) on growth, chlorophyll content, plant quality, and elemental tissue concentration were determined. With NO3 − as the nitrogen (N) form, both azalea cultivars exhibited less vegetative growth, lower overall plant quality, with leaves showing visual chlorotic symptoms in comparison to plants receiving NH4 + as the N‐form. Leachate pH was highest with NO3 − as the predominate N‐form and decreased significantly with each increment of NH4 +. With both azalea cultivars, N‐form significantly influenced uptake and utilization of essential plant nutrients. Leaf concentrations of N, potassium (K), calcium (Ca), sulfur (S), boron (B), and molybdenum (Mo) were highest with NO3 −‐N. Leaf elemental concentrations of phosphorous (P), magnesium (Mg), c...
Databáze:	OpenAIRE
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