Abstract
Deficiency of wheat grain iron (Fe) and zinc (Zn) is common nutritional problem in the developing countries and thus increasing their concentrations is a major challenge. Field experiments were conducted to investigate the effect of different levels of fertilizer nitrogen, phosphorus, potassium (100–200 % NPK) and foliar Fe application (3 % FeSO4.7H2O at 40, 60, and 75 days after sowing) on improving Fe and Zn concentrations in grain and molar ratio of phosphorus/iron (P/Fe) and phosphorus/zinc (P/Zn). Data obtained during the two year (2010–2011 and 2011–2012) field experiment reveals that foliar Fe spray along with fertilizer NPK significantly increased the grain Fe concentration by 6–15 %; whereas a sharp decrease in the grain Zn concentration under super optimal fertilization is attributed to the depressive effect of excessive phosphorus in the treatments. Molar ratio of P/Fe in wheat grains signifies the increased bioavailability of Fe in wheat grains but P/Zn increase under super-optimal NPK application calls for P management to correct the reduced level of Zn in wheat grains.
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Financial assistance by Indian Agricultural Research Institute, New Delhi, in form of Senior Research Fellowship awarded to the first author during the course of this investigation is gratefully acknowledged. Authors are thankful to the Director, Indian Agricultural Research Institute, New Delhi, for providing the necessary facilities for the successful completion of the work.
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Rakshit, R., Patra, A.K., Purakayastha, T.J. et al. Super-Optimal NPK Along with Foliar Iron Application Influences Bioavailability of Iron and Zinc of Wheat. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 86, 159–164 (2016). https://doi.org/10.1007/s40011-014-0428-2
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DOI: https://doi.org/10.1007/s40011-014-0428-2