Potassium uptake kinetics in native forage grass species from Pampa Biome
2022
Fernandes,Gracieli | Marques,Anderson César Ramos | Ribeiro,Bruna San Martin Rolim | Cardoso,Paula de Souza | Tagliapietra,Eduardo Lago | Friedrich,Eduardo Daniel | Weber,Patric Scolari | Krug,Amanda Veridiana | Kulmann,Matheus Severo de Souza | Paula,Betania Vahl de | Nicoloso,Fernando Teixeira | Brunetto,Gustavo
ABSTRACT: This study quantified K uptake kinetic parameters in grass species Paspalum notatum, Paspalum urvillei and Axonopus affinis to associate them with growth. Ten milliliters (10 ml) of nutrient solution were collected in two-liter pots - with five repetitions in 24 hours - in order to determine K concentrations in the samples. Shoot and root dry matter, root length, volume, diameter and surface area, as well as kinetic parameters associated with nutrient uptake (Vmax, Km, Cmin and I) were determined. Species P. notatum was the one presenting the highest root, shoot and total dry matter production, as well as the highest root volume. P. urvillei recorded the highest K content, which may be associated with thinner roots and greater root surface area. A. affinis recorded the highest Vmax value, which led to greater K uptake efficiency.
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