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M. Zhang, M. Nyborg, and S.S. Malhi

This research was supported by Alberta Agriculture Research Institute and the Fertilizer Division of Sherritt. We acknowledge the technical support of Monica Molina-Ayala and Zhixiong Zhang. Use of the controlled/slow-release fertilizers

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Raul I. Cabrera

Seven nursery grade (8- to 9-month duration), polymer-coated, controlled-release fertilizers (CRF) were topdressed or incorporated to a peat: sand: vermiculite medium to yield the same amount of N per container. The pots were uniformly irrigated with DI water every week. Leachates were collected and analyzed for N (ammonium plus nitrate) concentration. Two distinct N release (NR) patterns were observed over the 180-day experiment. Osmocote 18–6–12FS, Prokote-P 20–3–10, Osmocote 24–4–8HN, and Polyon 25–4–12 exhibited a NR pattern that closely followed changes in average daily ambient temperatures (AT) over the season. This relationship was curvilinear in nature, with NR being highly responsive to AT up to 25°C. Conversely, Osmocote 18–6–12, Nutricote 18–6–8 (270), and Woodace 20–4–12 showed a stable NR pattern over a wider range of AT, with NR rates 30% to 60% lower than those in the temperature-responsive CRF. Incorporation produced significantly higher cumulative N releases than topdressing but without effect on the actual pattern of NR over the season. Regardless of the N formulation in the CRF, >80% of the N recovered in the leachates was in the nitrate form.

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Margaret M. Saska and Yulia A. Kuzovkina

-grown willows used for cut-stem production based on yield and timing of tip abscission and floral bud burst across five concentrations of controlled-release fertilizer. Yield data were collected on commercially important parameters: total stem length, stem

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Luther C. Carson, Monica Ozores-Hampton, Kelly T. Morgan, and Steven A. Sargent

Department of Agriculture and Consumer Services adopted a series of best management practices, which includes the use of CRF ( Bartnick et al., 2005 ). Controlled-release fertilizers are SFs occluded in a polymer, resin, sulfur, or a polymer covering a sulfur

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Gladys A. Andiru, Claudio C. Pasian, Jonathan M. Frantz, and Pablo Jourdan

impatiens plants grown with water-soluble fertilizer (WSF) or controlled-release fertilizers (CRFs) of different longevities (mo.) during Expt. 1. The models describe the rate response of each CRF longevity. Plants were grown with CRF of 3–4, 5–6, 8–9, or 12

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P. Chris Wilson and Joseph P. Albano

Nitrogen applications are essential for producing quality ornamental plants. Nitrogen commonly is applied as nitrate (NO 3 − ) or ammonium (NH 4 + )-N in commercially available soluble and/or controlled-release fertilizer formulations. Ammonium-N is

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Heather Hasandras, Kimberly A. Moore, and Lyn A. Gettys

developed with hydrilla to grow southern naiad to increase its production and expand its use in natural aquatic ecosystem restoration. The objective of this study was to determine which substrate and controlled-release fertilizer rate would result in the

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Tyler C. Hoskins, James S. Owen Jr., and Alex X. Niemiera

weeks after potting (WAP). Fallow, 2.7-L nursery containers with a pine bark:sand (9:1, by volume) substrate and controlled-release fertilizer (CRF) applied as (□) dibble, (•) incorporated, (O) topdressed or (■) without CRF during irrigated with

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Diane M. Camberato, James J. Camberato, and Roberto G. Lopez

), molybdenum (Mo), and zinc (Zn) present in the water-soluble and controlled-release fertilizer treatments. Table 2. Approximate total quantity (mg per container) of ammonium nitrogen (NH 4 -N), urea, nitrate nitrogen (NO 3 -N), soluble nitrogen (N), phosphorus

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Carey Grable, Joshua Knight, and Dewayne L. Ingram

rating was highest for Rate 2. Rate 3 root rating was also significantly higher than for the control. Table 1. The effects of controlled-release fertilizer products and rates on growth of ‘Double Play Pink’ japanese spirea and ‘Smaragd’ arbovitae. The