Adaptive attributes of tropical forage species to acid soils. V. Differences in phosphorus acquisition from less available inorganic and organic sources of phosphate

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dc.creatorRao, Idupulapati M.
dc.creatorBorrero, V.
dc.creatorRicaurte Oyola, José Jaumer
dc.creatorGarcía, Ramiro
dc.date1999-07
dc.date2016-11-10T20:33:37Z
dc.date2016-11-10T20:33:37Z
dc.date.accessioned2026-06-27T14:45:24Z
dc.descriptionLow phosphorus (P) supply is a major limitation to pasture establishment and production in highly weathered acid soils. Previous research showed that the forage legume, Arachis pintoi, was more efficient in acquiring P from infertile acid soils than the forage grass, Brachiaria dictyoneura. The main objective of the present study was to determine whether the higher P‐uptake efficiency (defined as “milligrams of P uptake in shoot biomass per unit root length") of the legume results from its greater ability to mobilize P from less available forms of phosphate (aluminum phosphate and organic P). The grass, Brachiaria dictyoneura CIAT 6133, and the legume, Arachis pintoi CIAT 17434, were grown in the greenhouse for 75 days in monoculture or in association. They were planted in large plastic containers holding either one of two acid soils of contrasting texture (sandy or clay loam) and amended with different sources of P. Four sources of P were used: di‐calcium phosphate (Ca‐P), aluminum phosphate (Al‐P), phytic acid (organic‐P), and cow manure (dung‐P). Except for Al‐P, which was applied at two levels (20 and 100 kg P ha−1), the other sources were applied at 20 kg P ha−1. We found greater differences in P acquisition between the grass and legume than between the two types of acid soil. Acquisition of P by the legume was markedly greater than that of the grass, regardless of the source of P. The legume accessed 205 to 220% more sparingly soluble, inorganic P from soil compared to the grass. The relationship between shoot P uptake and root length showed that the legume roots acquired more P per unit root length than did the grass roots. The superior ability of the legume roots to acquire P from different P sources was associated with higher levels of inorganic P in roots. These results indicate that one reason for the success of Arachis pintoi in competing with aggressive grasses was its ability to acquire P from less available forms present in acid soils. This study also suggests that the measurement of inorganic‐P levels in roots may serve as a selection method to evaluate tropical forage legumes for their adaptation to less available P sources in P‐deficient acid soils.
dc.identifierhttps://hdl.handle.net/10568/77718
dc.identifier.urihttp://hdl.handle.net/123456789/87545
dc.languageen
dc.publisherInforma UK Limited
dc.rightsOpen Access
dc.sourceRao, Idupulapati Madhusudana; Borrero, V.; Ricaurte Oyola, Jaumer J.; García, Ramiro. 1999. Adaptive attributes of tropical forage species to acid soils. V. Differences in phosphorus acquisition from less available inorganic and organic sources of phosphate . Journal of Plant Nutrition (USA) 22(7):1175-1196.
dc.subjectfeed crops
dc.subjectacid soils
dc.subjectbrachiaria dictyoneura
dc.subjectarachis pintoi
dc.subjectsoil fertility
dc.subjectphosphate fertilizers
dc.subjectsoil
dc.subjecttropical zones
dc.subjectbiomass
dc.subjectclay soils
dc.subjectfeed legumes
dc.subjectpastures
dc.subjectphytic acid
dc.subjectnutrient uptake
dc.subjectplant nutrition
dc.subjectmineral nutrients
dc.subjectfertilidad del suelo
dc.subjectsuelo ácido
dc.subjectabonos fosfatados
dc.subjectsuelo
dc.subjectzona tropical
dc.subjectbiomasa
dc.subjectsuelo arcilloso
dc.subjectleguminosas forrajeras
dc.titleAdaptive attributes of tropical forage species to acid soils. V. Differences in phosphorus acquisition from less available inorganic and organic sources of phosphate
dc.typeJournal Article

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