Non-labile phosphorus acquisition by Brachiaria

Brachiaria are tolerant to low phosphorus (P) soils and may enhance P soil availability. The identification of mechanisms driving this effect is important. Our objective was to determine responses of palisade grass and ruzigrass to mineral oxide-bound P. Palisade grass (Brachiaria brizantha) and ruz...

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Published in:Journal of plant nutrition 2016-07, Vol.39 (9), p.1319-1327
Main Authors: Merlin, Alexandre, Rosolem, Ciro Antonio, He, ZhenLi
Format: Article
Language:English
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Brachiaria
Brachiaria brizantha
Phosphorus
rhizosphere
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description Brachiaria are tolerant to low phosphorus (P) soils and may enhance P soil availability. The identification of mechanisms driving this effect is important. Our objective was to determine responses of palisade grass and ruzigrass to mineral oxide-bound P. Palisade grass (Brachiaria brizantha) and ruzigrass (Brachiaria ruziziensis) were grown in nutrient solution (NS), where P was supplied as goethite and amorphous aluminum-oxide (Al-oxide). Only half of each pot received P. Dry matter yields of Brachiaria species having oxide-P as the sole P source were similar to those grown with water-soluble P. Inorganic P was found in the NS after 7 days, and organic P at 14 days after plant emergence. The presence of dissolved organic carbon (DOC) indicates an intense and quick response of the root system to the treatments. Results indicate enzyme and/or organic acids (OAs) root exudation as a strategy of these plants to access soil sparingly soluble P forms.
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subjects Brachiaria
Brachiaria brizantha
Phosphorus
rhizosphere
title Non-labile phosphorus acquisition by Brachiaria
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