Phosphorus Fraction in a Yellow Latosol Cropped Under No-tilage System in the Brazilian Amazon

Rubia Carla Ribeiro Dantas, Edilson Carvalho Brasil, Mário Lopes da Silva Júnior, Marcos André Piedade Gama

Abstract


Phosphorus (P) deficiency is one of the main factors that limits productivity in Brazilian soils. However, soil management under no-tillage system (NT) may alter the availability of P in the soil. The objective of this study was to evaluate the dynamics of P fractions in a dystrophic Yellow Latosol, cropped under no-tillage for a long period of time in the Amazon Biome. The study was conducted on a farm located in the municipality of Paragominas, southeastern Pará. This experiment evaluated plots cultivated in plots at nine (NT9), 11 (NT11) and 13 (NT13) years of no-tillage system adoption, in one plot under conventional cultivation system (CS) and a surrounding area under native forest (NF) at depths of 0-10, 10-20, 20-30 and 30-40 cm. The soil samples were subjected to P chemical fractionation to determine the different fractions. The soil management systems showed differential capacity of P accumulation. In the areas under no-tillage, P is accumulated in the toplayer and drastically reduced with depth, while in CS, this reduction is less pronounced. In the 0-20 cm depth layer during the adopted period of the no-tillage system, it was observed an increase in the content of inorganic phosphorus extracted by resin and 0.5 M NaHCO3 (PiAER and PiBIC) and organic phosphorus extracted by 0.5 M NaHCO3 (PoBIC), fractions considered as available for Biomass. Regardless of the year of adoption, the no-tillage system was superior to CS and NF. This was also observed for the inorganic and organic fractions extracted by NaOH 0.1M (PiHid-0.1 and PoHid-0.1)and inorganic fraction extracted by HCl 1M (PiHCl).


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DOI: https://doi.org/10.5296/jas.v8i3.16668

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