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Effects of nutrient concentration in the medium on the growth and mineral uptake in wheat, Agropyron and their hybrids

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... It was reported by many respondents in Nakuru and Uasin Gishu districts (80%) that fertilizers used on wheat in the same cu-marginal regions are diammonium phosphate, monoammonium phosphate and urea which are NH 4 + -based. It is established that NH 4 + ions reduce the absorption of Cu 2+ ions (Sigunga et al., 1986;Tills and Alloway, 1981), and enhance the uptake of negatively charged ions like H 2 PO 4 -, HPO 4 = and SO 4 = (Blair et al., 1970;Smith and Jackson, 1987). Tills and Alloway (1981) had observed that high levels of NH 4 + -containing fertilizers used on soils with low copper content could cause copper deficiency in wheat. ...
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