Non-labile phosphorus acquisition by Brachiaria
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Data
2016-01-01
Autores
Merlin, Alexandre [UNESP]
Rosolem, Ciro Antonio [UNESP]
He, ZhenLi
Título da Revista
ISSN da Revista
Título de Volume
Editor
Taylor & Francis Inc
Resumo
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.
Descrição
Palavras-chave
Phosphorus, rhizosphere, Brachiaria
Como citar
Journal Of Plant Nutrition. Philadelphia: Taylor & Francis Inc, v. 39, n. 9, p. 1319-1327, 2016.