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This article in AJ

  1. Vol. 70 No. 3, p. 411-414
    Received: July 8, 1977



Manganese Availability of Calcareous Soils of Lebanon1

  1. M. I. A. Khan and
  2. J. Ryan2



Major agricultural areas of Lebanon were surveyed to determine Mn availability of soils and Mn content of crops grown on these soils. All soils sampled were calcareous and contained variable amounts of organic matter. Though a large number of crop species were sampled, no Mn deficiency symptoms were apparent, while Mn contents, which varied with the crop, were considered adequate by accepted criteria. A relatively small percentage of the soils extracted with NH4OAC, NH4H2PO4, and MgCl2 were considered deficient while none were deficient according to criteria for the DTPA extract. All availability indices showed Mn to increase with O.M. content but decrease with CaCO3 content. Availability was lowest in the drier Beka's Valley where O.M. was low and CaCO3 high. Inclusion of pH and CaCO3 in multiple regression analysis generally improved prediction of Mn uptake for all tests.

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