Artigo
Phosphate sources affect P and N nutrition in pluri-specific natural grasslands in the Brazilian Pampa biome
Registro en:
Oliveira LB, Tiecher T, Marques ACR, Somavilla A, Ruthes BES, Crestani C, Kaschuk G, Rheinheimer DS, Quadros FLF. Phosphate sources affect P and N nutrition in pluri-specific natural grasslands in the Brazilian Pampa biome. Rev Bras Cienc Solo. 2022;46:e0210145.
1806-9657
Autor
Oliveira, Leandro Bittencourt de
Tiecher, Tales
Marques, Anderson César Ramos
Somavilla, André
Ruthes, Barbara Elis Santos
Crestani, Camila
Kaschuk, Glaciela
Rheinheimer, Danilo dos Santos
Quadros, Fernando Luiz Ferreira de
Institución
Resumen
Texto completo High acidity and low soil P availability in the soils from the Pampa natural
grasslands generally limit the forage growth and economic return. Thus, to increase
the economic return and avoid environmental degradation and biodiversity loss due to
replacement by intensive cropping systems, it is essential to improve the soil P availability. This
study aimed to diagnose the nutritional status of the pluri-specific natural grasslands amended
with different history of P sources. Additionally, we also try to indicate the most appropriate
range of soil P availability for maximizing forage growth. The experiment started in 1997 in
an area of Pampa natural grasslands in the state of Rio Grande do Sul, Brazil. The treatments
evaluated the application of Gafsa hyperphosphate (HP) and triple superphosphate (SP) for
four years (1997, 1998, 2002, and 2010). Soil and aboveground biomass sampling were
performed five times from October 2010 to March 2011 to access aboveground biomass
production, botanical composition, soil available P, and N and P nutrition index. Greater
P availability in the soil amended with SP produced more forage and resulted in a higher
P accumulation than in the soil amended with HP. The ideal range of soil P availability in the
soils of natural grasslands ranged from 14 to 20 mg kg ˗1 , varying for different plant species.
The species Paspalum plicatulum and Aristida laevis produce less aboveground biomass and
accumulate less P in their tissue than Dichantelium sabulorum and Eustachys uliginosa, and
P. notatum. Therefore, areas of natural grasslands dominated by D. sabulorum, E. uliginosa
and P. notatum demand higher soil P availability to maintain high forage production. Soil P
fertilization of pluri-specific natural grasslands in the Brazilian Pampa biome must consider
the dominant forage species in the area and the soil P availability.