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Mary Jane Clark and Youbin Zheng

growing substrate for each pot by hand at rates of 0.15, 0.45, 0.75, 1.05, 1.35, or 1.65 kg·m −3 nitrogen. The guaranteed minimum analysis of this CRF is 8.09% ammonical N, 7.16% nitrate N, 3.75% urea N, 6.00% phosphoric acid, 13.00% soluble potash, 4

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Michael V. Mickelbart

grinder. Nitrogen was analyzed using the Dumas combustion procedure ( Simonne et al., 1994 ). All other elements were digested with 1.0 mL of HNO 3 at 110 °C for 4 h and quantified by inductively coupled plasma spectrometry on a PerkinElmer Elan DRCe ICP

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E.A. Guertal

A brief review of slow-release fertilizer technology Slow-release nitrogen fertilizers can be separated into three broad categories. The first is “natural” organic fertilizer, with the N contained as a part of crop residue, animal waste, or other

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S. Castro Bustamante and T.K. Hartz

California is a leader in the organic production of processing tomato ( Solanum lycopersicum L.), with >3,400 ha produced annually ( Klonsky, 2010 ). Nitrogen is often the most limiting nutrient in organic vegetable production systems, especially

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Jean-Pierre Goffart, Marguerite Olivier, and Marc Frankinet

supplemental N is as follows ( Olivier et al., 2006 ): Fig. 1. Steps in the Walloon Agricultural Research Center (Gembloux, Belgium) decision support system for managing the nitrogen fertilization of a potato crop at field scale. where HNT 70 is the CM reading

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Xia Chun-hua and Chen Jian-hua

, adsorption, and chemical activity ( Liu, 2004 ) , and can adsorb ammonium nitrogen (NH 4 + −N). The use of oyster shell in the preparation of slow-release nitrogen fertilizer ( Miao et al., 2007 ) can also alleviate the loss of N. The soilless cultivation of

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Amir Ali Khoddamzadeh and Bruce L. Dunn

potted chrysanthemums was more than $125 million in 2012 ( U.S. Department of Agriculture, 2013 ). Chrysanthemums have a high N requirement ( Lunt and Kofranek, 1958 ). Nitrogen is a macronutrient that affects plant chlorophyll content ( Moorby and

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Luther C. Carson, Monica Ozores-Hampton, Kelly T. Morgan, and Jerry B. Sartain

surface during Fall 2011 and 2013 in Immokalee, FL. Measured nitrogen release from CRFs incubated the field pouch method. When data were analyzed without the two treatments added in 2013, there were interactions ( P < 0.05) between CRF and year in six of

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M. Gabriela Buamscha, James E. Altland, Dan M. Sullivan, Donald A. Horneck, and John P.G. McQueen

micronutrient fertilizers ( Buamscha et al., 2007a ). However, vinca growing in aged bark had higher stem biomass and foliar nitrogen (N) than those in fresh bark after 8 weeks; differences were attributed to N availability. Comparisons of fresh and aged pine

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Patrick Conner

grow and can reach 2 m in length by the end of the first season ( Sparks, 2005 ). Nitrogen fertility levels can have a profound effect on tree seedling growth. Shortening rotation time by maintaining high fertility is a common method of increasing