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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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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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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

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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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Guihong Bi and Carolyn F. Scagel

Perennial plants can store nitrogen (N) and remobilize the stored N for new growth the next spring ( Millard, 1995 ). There is a positive correlation between the amount of stored N in perennial plant tissues and plant growth in early spring

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Timothy K. Broschat

are reduced nitrogen availability ( Billeaud and Zajicek, 1989 ), water repellency ( Gartner, 1978 ), and allelopathy ( Duryea et al., 1999 ; Still et al., 1976 ). One question that is often asked by landscapers is whether fertilizers should be

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M. Leonard Wells and Bruce W. Wood

clearcut ( Pond et al., 2006 ). Two common fertilizer supplements to commercial orchards are nitrogen (N) and potassium (K). The lower and upper foliage sufficiency concentrations for these vary from 2.3% to 4.0% depending on the extension service

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Giuseppe Colla, Carolina María Cardona Suárez, Mariateresa Cardarelli, and Youssef Rouphael

Nitrate (NO 3 – ) is the principal nitrogen (N) source for most crops and a large number of these, including vegetables, require large quantities of NO 3 – fertilizer to attain maximal yields ( Ruiz et al., 2006 ). Balancing the amount of N