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Frederick S. Davies and Glenn Zalman

citrus trees in Florida. Adequate nutrition is essential for production of high-quality citrus nursery trees, but application rates, frequencies of application, and nitrogen (N) sources vary greatly among citrus nurseries worldwide. For example, annual N

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Suejin Park, Sarah A. Mills, Youyoun Moon and Nicole L. Waterland

were applied at either half (0.5×), equal to (1×), or twice (2×) the manufacturer’s recommended application rate ( Table 1 ). Plants were held in the greenhouse under the previously described environmental conditions for subsequent evaluations. Half of

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Ivan dos Santos Pereira, Luciano Picolotto, Michél Aldrighi Gonçalves, Gerson Kleinick Vignolo and Luis Eduardo Corrêa Antunes

. In addition to the K rates (treatments), all plots were fertilized with 5 g/plant (33.3 kg·ha −1 ) of P and 15 g/plant (100 kg·ha −1 ) of N. A single application of P and K was made at the beginning of budbreak and before flowering on 26 Aug. 2009, 9

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Aaron L. Warsaw, R. Thomas Fernandez, Bert M. Cregg and Jeffrey A. Andresen

experiment were to determine the effects of scheduling irrigation applications based on DWU on irrigation volume, plant growth, substrate soluble salt accumulation, runoff, and nutrient loss compared with a conventional irrigation rate. Materials and Methods

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Laura Jalpa, Rao S. Mylavarapu, George J. Hochmuth, Alan L. Wright and Edzard van Santen

additional information on determining the efficiency of current management practices related to rate and timing of N fertilizer applications ( Zemenchik and Albrecht, 2002 ). Limited information is available where NUE and APR are compared and evaluated

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Amir M. González-Delgado, Manoj K. Shukla and Brian Schutte

the photosynthetic rate of pecan under greenhouse and field conditions ( Wood et al., 1984 , 1985 ). Therefore, inappropriate application of pesticides could significantly reduce the tree energy reserves affecting the productivity of pecans ( Wood et

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Bee Ling Poh, Aparna Gazula, Eric H. Simonne, Francesco Di Gioia, Robert C. Hochmuth and Michael R. Alligood

recommendation for tomato (seasonal application 200 lb/acre N) was used as the 100% N rate, which was reduced to 80% (160 lb/acre) and 60% (120 lb/acre) for other N rate treatments. Ammonium nitrate (34N–0P–0K; Mayo Fertilizer) was used to provide the required N

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James T. Brosnan, Dean A. Kopsell, Matthew T. Elmore, Gregory K. Breeden and Gregory R. Armel

, Research Triangle Park, NC) at low, medium, and high application rates. Low, medium, and high rates for mesotrione were 0.28, 0.35, and 0.42 kg·ha −1 , respectively. For topramezone, low, medium, and high rates were 0.018, 0.025, and 0.038 kg·ha −1

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Thomas G. Bottoms, Timothy K. Hartz, Michael D. Cahn and Barry F. Farrara

pressure to improve their management practices to protect groundwater. Recently proposed regulations would require growers to report N fertilization rates and to bring N application into approximate balance with crop N uptake. Annual N uptake by strawberry

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Oscar L. Vargas and David R. Bryla

arranged in a split-plot design with a combination of two N sources (ammonium sulfate and urea) and two methods of fertilizer application (weekly fertigation and dry granular fertilizer applications) as main plots and four N rates as subplots. Each subplot