Zinc Biofortifcation in the Grains of Two Wheat (Triticum aestivum L.) Varieties Through Fertilization

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We examined the efects of zinc (Zn) fertilization on wheat, focusing on yield and biofortifcation in the grains of two wheat varieties. Five Zn rates, i.e., 0, 1.5, 3.0, 4.5, and 6.0 kg ha−1 applied as ZnSO4·7H2O (23% Zn), and two wheat varieties, i.e., ‘BARI Gom-25’ and ‘BARI Gom-26,’ were used in the study. All plant characteristics, except 1,000-grain weight and plant height, i.e., tillers plant−1 , spikes m−2 , spike length, spikelets spike−1 , and grains spike−1 , were signifcantly infuenced by Zn fertilization. Treatment with 3.0 kg Zn ha−1 (Zn3.0) produced the highest grain yield (3.90 t ha−1 ), which was statistically similar to Zn4.5 and Zn6.0 treatments. Te control treatment (Zn0) produced the lowest grain yield (2.99 t ha−1 ). Te concentrations of N, Zn, and Fe were signifcantly and positively infuenced by Zn treatment. Te crop varieties did not difer signifcantly in terms of N and Zn concentrations. However, the grain Fe concentration was remarkably higher in ‘BARI Gom-26’ than in ‘BARI Gom-25.’ Te grain N and protein concentrations increased linearly with the Zn application rate. Te grain Zn concentration increased with Zn application rates in a quadratic line, indicating that the concentration of Zn in wheat grain increased with Zn fertilization; however, it attained a maximum value in the Zn4.5 treatment, afer which it declined with higher rate of Zn application. Te application of Zn at the rate of 4.5 kg ha−1 resulted in the highest Zn fortifcation (39.7 µg g−1 ) in wheat grains, which was 17.1% higher than in the control treatment. Te response curve showed that 4.62 kg ha−1 for ‘BARI Gom-25’ and 3.94 kg ha−1 for ‘BARI Gom-26’ were the optimum Zn rates for achieving higher wheat grain yield. However, 5.5 kg ha−1 was the optimum Zn rate for obtaining higher Zn fortifcation in wheat grains.
Wheat, Fertilization, Zinc, Iron
Das, S., M. Jahiruddin, M.R. Islam, A. Al Mahmud, A. Hossain, and A.M. Laing. 2020. “Zinc Biofortification in the Grains of Two Wheat (Triticum aestivum L.) Varieties Through Fertilization,” Acta Agrobotanica, 73(1):7312. https://doi.org/10.5586/aa.7312