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<p>Phosphate fertilization affects <i>Eucalyptus</i> growth and soil phosphorus (P) pools differently during the early years of stand growth. Because the effects observed at this stage may change throughout the rotation, we aimed to assess the impact of phosphates on soil organic (Po) and inorganic (Pi) P pools, growth, and also the nutrient stock of <i>Eucalyptus</i> stands throughout an eight-year rotation. We have evaluated single superphosphate (SSP) as a highly soluble source, rock phosphate (RP) as a low-solubility source, and a mixture of both (PM). Throughout the rotation, several samples were collected to quantify the soil P fractions, and inventories were used to assess tree growth. At the end of the rotation (∼ 8 years old), the aboveground biomass and nutrient content in the compartments were measured to determine the nutrient stocks in the trees. The RP treatment showed a ∼ 90% decrease in the moderately labile pool due to P-Ca solubilization. The SSP and control showed an increase in labile and moderately labile P pools throughout rotation, in which the Po had a contribution of 65% on average. At the end of the rotation, P fertilized treatments showed 6–24% more volume and biomass than control. Significant alterations in the soil P pools were observed throughout the rotation, exhibiting a strong correlation with the source of P applied. Phosphate fertilization resulted in greater tree growth, although greater productivity was observed in the control. This demonstrates the great adaptability of <i>Eucalyptus</i> when grown under suitable soil conditions with a high input of organic matter.</p>

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Effects of Phosphate Solubility on Soil P Pools, Nutrition, and Growth of Eucalyptus Over an Eight-Year Rotation

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Adam da Cruz Rodrigues,
  • Estela Covre Foltran,
  • Ana Paula Bettoni Teles,
  • Antonio Leite Florentino,
  • Silvio Henrique Menezes Gomes,
  • José Henrique Tertulino Rocha,
  • Paulo Sergio Pavinato,
  • José Henrique Bazani,
  • Alexandre de Vicente Ferraz,
  • José Leonardo de Moraes Gonçalves

摘要

Phosphate fertilization affects Eucalyptus growth and soil phosphorus (P) pools differently during the early years of stand growth. Because the effects observed at this stage may change throughout the rotation, we aimed to assess the impact of phosphates on soil organic (Po) and inorganic (Pi) P pools, growth, and also the nutrient stock of Eucalyptus stands throughout an eight-year rotation. We have evaluated single superphosphate (SSP) as a highly soluble source, rock phosphate (RP) as a low-solubility source, and a mixture of both (PM). Throughout the rotation, several samples were collected to quantify the soil P fractions, and inventories were used to assess tree growth. At the end of the rotation (∼ 8 years old), the aboveground biomass and nutrient content in the compartments were measured to determine the nutrient stocks in the trees. The RP treatment showed a ∼ 90% decrease in the moderately labile pool due to P-Ca solubilization. The SSP and control showed an increase in labile and moderately labile P pools throughout rotation, in which the Po had a contribution of 65% on average. At the end of the rotation, P fertilized treatments showed 6–24% more volume and biomass than control. Significant alterations in the soil P pools were observed throughout the rotation, exhibiting a strong correlation with the source of P applied. Phosphate fertilization resulted in greater tree growth, although greater productivity was observed in the control. This demonstrates the great adaptability of Eucalyptus when grown under suitable soil conditions with a high input of organic matter.