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Response of wild subclovers to soil calcium in xeric and acid Spanish soils

AuthorsPastor Piñeiro, Jesús ; Martín Ramos, Amalia; Oliver, Salvador
KeywordsEcological profiles
Plant microelements (Mn, Fe),
Plant macroelements (Ca, Mg, K, Na)
Soil calcium and aluminium
Trifolium subterraneum
Var. brachycladum
Var. subterraneum
Issue Date1993
PublisherKluwer Academic Publishers
CitationOptimization of Plant Nutrition: 603-609 (1993)
AbstractWe studied nutrition in 123 field populations of Trifolium subterraneum, var. subterraneum and var. brachycladum Gib. et Belli, with respect to calcium and aluminium tolerance in low-fertility soils in western Spain, most of them situated in semi-arid environments. The observation of the ecological profiles allowed us to know the differences about the autoecological behaviour of the species and the two varieties with respect to soil exchangeable calcium and aluminium and percent of soil calcium carbonate. The response of populations of the two varieties of Trifolium subterraneum L. to the increase of soil exchangeable calcium directly affects the contení of Mn and Na. Resides, we found significant differences for Mg and Fe contents in the populations of var. brachycladum. Differences in intervarietal behaviour were mainly related to populations that grew on soils with low and high exchangeable calcium levéis, while the differences were small or absent at intermedíate levéis. There was a clear intervarietal difference with respect to the mean valúes of Na and Ca in the plants. In soils with higher exchangeable calcium levéis there were also differences between both varieties with respect to Mg and K plant contení, and therefore for Ihe divalenl/monovalenl ralio. Our sludy furlher showed Ihal populalions exposed lo Ihe same level of available nulrienls in low-ferlility soils have markedly different uplake capacilies. The results confirm the existence of stress-loleranl populations growing in soils with exchangeable calcium levéis lower Ihan 3meq. 100 g 1 . The resulls oblained will help lo clarify Ihe use of nulrienls by plañí cióse taxa in slressful environmenls.
Description7 páginas y tablas estadísticas
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