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Phosphorus fractionation in grasses with different resource-acquisition characteristics in natural grasslands of South America

Published online by Cambridge University Press:  17 June 2019

Anderson Cesar Ramos Marques*
Affiliation:
Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Rogério Piccin
Affiliation:
Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Tales Tiecher
Affiliation:
Department of Soil Science of the Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
Leandro Bittencourt de Oliveira
Affiliation:
Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
João Kaminski
Affiliation:
Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Roque Junior Sartori Bellinaso
Affiliation:
Department of Soil Science of the Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
Amanda Veridiana Krug
Affiliation:
Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
Luciano Colpo Gatiboni
Affiliation:
State University of Santa Catarina (UDESC), Center of Animal and Rural Science (CAV), Lages, Santa Catarina, Brazil
Fernando Luiz Ferreira de Quadros
Affiliation:
Department of Animal Science, Santa Maria, Rio Grande do Sul, Brazil
Corina Carranca
Affiliation:
Instituto Nacional de Investigação Agrária e Veterinária, Oeiras, Portugal
Gustavo Brunetto
Affiliation:
Department of Soil Science of the Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
*
*Author for correspondence: Anderson Cesar Ramos Marques, Email: acrmarques@hotmail.com.br

Abstract

The natural grasslands in South America have soils with low phosphorus (P) availability (1.0 to 7.5 mg kg−1), possibly altering the absorption and accumulation of P in grasses. We evaluated the chemical fractionation of P in the leaves of the most important grasses present in these grasslands to better understand the mechanisms involved in the storage of P. The grasses studied were Axonopus affinis and Paspalum notatum (fast tissue cycling and high nutrient demand) and Andropogon lateralis and Aristida laevis (slow tissue cycling and low nutrient demand). They were grown in pots filled with an Ultisol with two levels of P: control, and addition of 50 mg P kg–1. The main P fractions were the inorganic soluble (44%) and P in RNA (26%). Addition of P increased the total P concentration, following the order A. affinis (140%) > P. notatum (116%) > A. lateralis (81%) > A. laevis (21%). In conclusion, the species A. affinis and P. notatum responded to P fertilization with high variation and accumulating P in less-structural chemical forms, such as inorganic P. The species A. lateralis and A. laevis showed low variation in the concentration of P forms, with higher P concentrations in structural forms.

Type
Research Article
Copyright
© Cambridge University Press 2019 

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