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Mechanism of nitrogen effect on zinc nutrition of flooded rice

F. M. Chaudhry, M. A. Kausar, A. Rashid and A. Rahmatullah
Plant and Soil
Vol. 46, No. 3 (APRIL 1977), pp. 649-654
Published by: Springer
Stable URL: http://www.jstor.org/stable/42933466
Page Count: 6
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Mechanism of nitrogen effect on zinc nutrition of flooded rice
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Abstract

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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