Summary
Nitrogen application increased Zn contents of flooded rice on two calcareous soils. Urea and (NH4)2SO4 being better N carriers than NH4NO3 resulted in higher increase. Nitrogen enhanced Zn contents partly through growth promotion but mainly by increasing soil Zn solubility and root efficiency for Zn absorption. Zinc solubility rose by an enigmatic mechanism and not from pH reduction or soluble Zn-HN3 complex formation as occurs for upland plants. Nitrogen aggravated Zn retention in upland plant roots as immobile Zn-protein complex was not important for rice. Bicarbonate inhibition of Zn uptake by rice from CO(NH2)2 application or its stimulation by lower redox potential from NH4NO3 addition were not involved.
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No. V in the series Micronutrient availability to cereals from calcareous soils.
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Chaudhry, F.M., Kausar, M.A., Rashid, A. et al. Mechanism of nitrogen effect on zinc nutrition of flooded rice. Plant Soil 46, 649–654 (1977). https://doi.org/10.1007/BF00015925
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DOI: https://doi.org/10.1007/BF00015925