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This article in AJ

  1. Vol. 63 No. 6, p. 860-863
     
    Received: Jan 23, 1971


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doi:10.2134/agronj1971.00021962006300060011x

Influence of Relative Humidity and Associated Anion on the Absorption of Mn and Zn by Soybean Leaves1

  1. N. Rossi and
  2. E. G. Beauchamp2

Abstract

Abstract

The influence of the relative humidity (RH) and either CI- or SO4= as the accompanying anion on Mn and Zn uptake by soybean (Glycine max L. cv ‘Altona’) leaf blades were studied in a growth chamber experiment over a 7-day period. The quantities of Mn and Zn washed off with water, adsorbed, absorbed, and translocated (by difference) were determined 0.5, 3, and 7 hours and 1, 3, 5, and 7 days after application.

The portion of the applied Mn or Zn absorbed by the leaf blades was small. However, the adsorbed quantities of both cations differed with the associated anion, relative humidity, and time of sampling.

The rate of absorption of either Mn or Zn was most rapid during the first 24 hours of the 7-day period. The quantities of Mn and Zn in the leaf blades were larger at 70% RH than at 25% RH. Absorption of both Mn and Zn was greater with the chloride rather than the sulfate salt. The apparent translocation of Zn out of the leaf blades was greater with the sulfate rather than the chloride salt. The apparent translocation of Mn out of the leaf blades was greater with the chloride salt. However, a smaller portion of the absorbed Mn or Zn was translocated out of the leaf with the chloride rather than the sulfate salt. It appeared that salt hygroscopicity had little influence on either Mn or Zn adsorption since there was no interaction between relative humidity and the accompanying anion.

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