10.57647/j.ijrowa.2024.1302.14

Soil phosphorus mobilization as affected by long-term organic fertilization in a tropical Regosol

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  • Kalline De Almeida Alves Carneiro1,
  • Tancredo Augusto Feitosa De Souza*1,
  • Gislaine Dos Santos Nascimento1,
  • Vânia Da Silva Fraga1,
  • Bruno de Oliveira Dias1,
  1. Postgraduate Program in Soil Science, Centre of Agrarian Sciences, Federal University of Paraiba, Areia, 58397-000, Paraiba, Brazil
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Published in Issue 2024-03-20

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This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Carneiro, K. D. A. A., Souza, T. A. F. D., Nascimento, G. D. S., Fraga, V. D. S., & Dias, B. de O. (2024). Soil phosphorus mobilization as affected by long-term organic fertilization in a tropical Regosol. International Journal of Recycling of Organic Waste in Agriculture, 13(2). https://doi.org/10.57647/j.ijrowa.2024.1302.14
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Abstract

Purpose: Phosphorus mobilization (PM) in tropical Regosols may be harmful to the environment and water quality. It is expected that high contents of soluble phosphorus in sandy soils may promote the P leaching through the transport of the available phosphorus from the soil surface to deeper layers. This study aimed to evaluate the PM in a tropical Regosol by using soil columns (10 cm depth) during steady saturated water flow and PM was correlated with Fe and Al oxides.

Method: Soil samples were collected in four sites characterized as smallholder farming systems that shared the same land uses and soil type with each other. P content was estimated by using water, Melich-1, and resin extraction protocols. We estimated the contents of Fe and Al oxides with high and low crystallinity. The miscible displacement technique was used to simulate P leaching in soil columns, and the leached P was quantified by colorimetry.

Results: Soil P loss showed a significant coefficient of determination (r2 > 0.80) with P content. We found the highest values of Fe oxalate (0.30 mg/g), and Al oxalate (0.53 mg/g) in the long-term organic fertilization, while the highest values of Fe dithionite and Al dithionite were found with the non-fertilization system.

Conclusion: The highest soil pH (8.01), soil P content by different extractors (P mehlich-1, P water, and P resin were 54.45, 14.36, and, 38.70 mg/kg, respectively), and soil P loss (128.83 mg/kg) were observed with the long-term non-fertilization system.

Highlights:
  • The continuous use of higher rates of farmyard manure influences the soil chemical properties and P loss in a Regosol.
  • Areas with long-term use of farmyard manure show a high rate of P mobilization.
  • Areas with the addition of high rates of farmyard manure in a short-term schedule may increase P mobilization.
  • The use of farmyard manure improves the organic matter accumulation, and available phosphorous, which leads to high vertical P loss.

Keywords

  • Farmyard manure,
  • Organic fertilization,
  • Phosphorus leaching,
  • Smallholder farming system,
  • Tropical Regosol
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