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Manganese Availability of Calcareous Soils of Lebanon 1
Author(s) -
Khan M. I. A.,
Ryan J.
Publication year - 1978
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1978.00021962007000030011x
Subject(s) - soil water , manganese , calcareous , calcareous soils , organic matter , crop , agronomy , chemistry , environmental chemistry , environmental science , botany , biology , soil science , organic chemistry
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 NH 4 OAC, NH 4 H 2 PO 4 , and MgCl 2 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 CaCO 3 content. Availability was lowest in the drier Beka's Valley where O.M. was low and CaCO 3 high. Inclusion of pH and CaCO 3 in multiple regression analysis generally improved prediction of Mn uptake for all tests.