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Maedza V. Khathutshelo, Nkomo Mpumelelo, Ngezimana Wonder and Mudau N. Fhatuwani

, micronutrients are involved in the metabolism by way of precursors from both the shikimate and the acetate-malonate pathways ( Crozier et al., 2000 ; Urquiaga, and Leighton, 2000 ). In this study, the indirect effect of micronutrient foliar application on

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David R. Byrnes, Fekadu F. Dinssa, Stephen C. Weller and James E. Simon

., 1982 ; National Resource Council, 2006 ). Vegetable amaranth is commonly cited as having unrealized potential to deliver mineral and vitamin micronutrients as well as protein to at-risk populations in regions with high rates of nutritional deficiencies

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Bruce W. Wood, Rufus Chaney and Mark Crawford

The existence of nickel (Ni) deficiency in certain horticultural crops merits development of fertilizer products suitable for specific niche uses and for correcting or preventing deficiency problems before marketability and yields are affected. The efficacy of satisfying plant nutritional needs for Ni using biomass of Ni hyperaccumulator species was assessed. Aqueous extraction of Alyssum murale (Waldst. & Kit.) biomass yielded a Ni-enriched extract that, upon spray application, corrects and prevents Ni deficiency in pecan [Carya illinoinensis (Wangenh.) K. Koch]. The Ni-Alyssum biomass extract was as effective at correcting or preventing Ni deficiency as was a commercial Ni-sulfate salt. Foliar treatment of pecan with either source at ≥10 mg·L–1 Ni, regardless of source, prevented deficiency symptoms whereas treatment at less than 10 mg·L–1 Ni was only partially effective. Autumn application of Ni to foliage at 100 mg·L–1 Ni during leaf senescence resulted in enough remobilized Ni to prevent expression of morphologically based Ni deficiency symptoms the following spring. The study demonstrates that micronutrient deficiencies are potentially correctable using extracts of metal-accumulating plants.

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M. Gabriela Buamscha, James E. Altland, Daniel M. Sullivan and Donald A. Horneck

initial fertility. However, research has shown that pine bark media contains sufficient micronutrients to produce woody plants. Niemiera (1992) extracted slightly lower levels of copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) from pine bark alone

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James E. Altland, Charles Krause, James C. Locke and Wendy L. Zellner

micronutrients (B, Fe, Mn, Cu, Mo, Zn) to support vigorous crop growth. Plants grown in peatmoss without added micronutrients have been shown to be deficient in Cu ( Adams et al., 1986 ), B and Fe ( Smilde, 1975 ), Zn ( Penningsfeld, 1972 ), and Mo ( Cox, 1988

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M. Courtney, M. Mcharo, D. La Bonte and W. Gruneberg

micronutrients iron, zinc, and vitamin A are essential to the human diet, large segments of the global population experience health consequences from inadequate intake ( Cichy et al., 2005 ; Long et al., 2004 ; Mason et al., 2001 ). Strategies to overcome these

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Maedza K. Vuwani, Mpumelelo Nkomo, Wonder Ngezimana, Nokwanda P. Makunga and Fhatuwani N. Mudau

metabolites (Ibrahim and Hawa, 2013). However, much focus has been on N, P, and K as the main nutrients affecting growth and development with little attention to trace elements. Micronutrients such as manganese, zinc, copper, iron, magnesium, and boron are

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Chun-Ho Pak and Chiwon W. Lee

Foliar micronutrient toxicity symptoms of Petunia hybrida `Ultra Crimson Star' were induced by elevated levels (from 0.25 to 6 mM) of boron (B), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo) and zinc (Zn) in the nutrient solution. Foliar toxicity symptoms of most micronutrients (except Fe) were characterized by leaf yellowing, interveinal chlorosis, and marginal necrosis. Mo toxicity was most severe. Leaf abnormality was not induced by Fe in the concentration range tested. Visible foliar toxicity symptoms developed when nutrient solution contained 5.4, 32, 28, 24, and 16 mg· liter-1, respectively, of B, Cu, Mn, Mo and Zn. Biomass yield was reduced when the fertilizer solution contained (in mg· liter-1): 22 B, 64 Cu, 335 Fe, 28 Mn, 24 Mo, and 33 Zn.

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Jacob H. Shreckhise, James S. Owen Jr., Matthew J. Eick, Alexander X. Niemiera, James E. Altland and Brian E. Jackson

reduce P leaching from containers when mixed into a pine bark substrate ( Ogutu and Williams, 2009 ; Owen et al., 2007 ; Ruter, 2004 ). Dolomite [CaMg(CO 3 ) 2 ] and micronutrient amendments are routinely mixed into container substrates before potting

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Suphasuk Pradubsuk and Joan R. Davenport

.S. Department of Agriculture, 2008 ), where the predominantly calcareous and/or high pH soils could limit the availability of micronutrients, because they tend to precipitate out of soil solution in a carbonate-dominated environment ( Epstein and Bloom, 2005