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T.K. Hartz, R. Smith and M. Gaskell

laboratory incubation experiment conducted at the University of California-Davis in 2008. These fertilizers were formulated from a variety of feedstocks, including fishery wastes, seabird guano, and plant materials. Ammonium (NH 4 -N) and nitrate-nitrogen (NO

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M. Lenny Wells

control received no N fertilizer inputs. Table 1. Comparison of nitrogen (N) rate used per field hectare versus nitrogen rate per treated area in emitter-adjacent, broadcast, broadcast-band, and ground-spray treatments from 2008 to 2012. Dolomitic lime was

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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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Sueyde Fernandes de Oliveira Braghin, Simone C. Mello, Jéssika Angelotti-Mendonça, Keigo Minami and Yuncong C. Li

quality, increasing the fertilizer use efficiency and preventing losses of nutrients, especially nitrogen (N) by leaching or denitrification ( Fageria and Baligar, 2005 ). CRFs are designed to release nutrients into the grown medium at a rate more closely

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M. Pilar Bañados, Bernadine C. Strik, David R. Bryla and Timothy L. Righetti

analysis. Back-transformed values are presented in figures and tables. Plant response to N fertilizer application rate was determined using orthogonal contrasts and pairwise comparisons. Results and Discussion Plant growth. Nitrogen fertilizer application

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

may be recommended, although the CRFs and mixes must consistently release a high portion of the total N to the intended crop. Fig. 1. Measured and fitted nitrogen (N) release from four representative controlled-release fertilizers (CRFs) [polymer

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Thomas A. Obreza and Arnold Schumann

. To remain sustainable, the industry must improve nitrogen (N) and phosphorus (P) fertilizer use efficiency because total maximum daily load implementation will limit N and/or P loading in watersheds where citrus is grown. The objectives of this

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David R. Bryla, Bernadine C. Strik, M. Pilar Bañados and Timothy L. Righetti

). Nitrogen is the predominant nutrient applied to blueberry for successful commercial growth and production. Although the blueberry plant is relatively small and slow-growing compared with many temperate fruit tree crops, the amount of N fertilizer applied to

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Bielinski M. Santos

in southeastern Florida: Challenges for urbanized coastal environments threatened by development, pollution, water supply, and storm hazards J. Coast. Res. 19 934 943 Fixen, P.E. West, F.B. 2002 Nitrogen fertilizers: Meeting contemporary challenges

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Wendy A. Johnson, Raymond A. Cloyd, James R. Nechols, Kimberly A. Williams, Nathan O. Nelson, Dorith Rotenberg and Megan M. Kennelly

Nitrogen (N) is an essential nutrient that crops require for growth and development ( Jones, 1998 ; Raven and Smith, 1976 ). The availability and form of N may vary depending on fertilizer type. Organic fertilizers, which are derived from natural