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- W1990333925 abstract "ABSTRACT Impatiens (Impatiens wallerana Hook. f.) is the most important annual bedding plant in the United States, based on wholesale dollar volume. Production of high-quality plants requires optimization of the nutrition regimen during growth, especially the total nitrogen (N) concentration and the ratio of N sources. The objective was to determine the N concentration and the nitrate (NO3 −−N):ammonium (NH4 +−N) ratio of N source that optimized bedding-plant impatiens growth and flower development. Four N concentrations (3.5, 7, 10.5, and 14 mmol N · L−1) were used in factorial combination with four ratios of NO3 −−N:NH4 +−N (4:0, 3:1, 1:1, and 1:3). Application of treatments was made for 30 d. Then for 10 d only deionized water was applied to reduce salt buildup. Substrate pH was lowest (4.9) with the NH4 +−N source and electrical conductivity (EC) highest, but never > 2.4 dS m−1. Nitrogen concentration and N source displayed an interaction for most growth parameters. Shoot fresh and dry weights and flower bud number were maximized at the 1:3 NO3 −−N:NH4 +−N ratio with a N concentration of 10.5 mmol L−1. However, plant diameter, leaf number, and leaf chlorophyll content responded quadratically to N form ratio, with the 1:1 ratio optimum at a concentration of 10.5 mmol N· L−1." @default.
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- W1990333925 date "2006-08-01" @default.
- W1990333925 modified "2023-09-23" @default.
- W1990333925 title "Nitrogen Source and Concentration Affect Growth and Performance of Bedding-Plant Impatiens" @default.
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- W1990333925 doi "https://doi.org/10.1080/01904160600767658" @default.
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