Labile pools of copper and zinc in calcareous soils as measured by DTPA and plant extraction

Mashhady, A.S.

Communications in Soil Science and Plant Analysis 14(9): 893-904

1983


ISSN/ISBN: 0010-3624
DOI: 10.1080/00103628309367416
Accession: 001217335

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Abstract
Labile pools of Cu and Zn were measured on two calcareous soils (sand, sandy clay loam) from Saudi Arabia, using successive extraction with DTPA, and successive cropping with Sudan grass followed by extraction with DTPA after each crop. The soils differed in their ability to supply Cu and Zn. The first DTPA extraction removed a major proportion of the labile pool, particularly in the sandy soil. The two soils showed a general decrease in extractable Cu and Zn with progressive extractions, Cu declining more rapidly than Zn. DTPA extractable Cu and Zn values determined after cropping were highly correlated with the DTPA extractable Cu and Zn values obtained after successive extractions.