Autor(es)

Firmano, Ruan Francisco ; Damian, Junior Melo ; Soares, Thais de Marchi ; Colzato, Marina ; Antonangelo, Joao Arthur ; Cerri, Carlos Eduardo P. ; Soares, Marcio Roberto ; Alleoni, Luis Reynaldo Ferracciu

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION; v. N/A, p. 16-pg., 2025-01-16.

Resumo

The difference between the phosphorus (P) levels determined by inductively coupled plasma optical emission spectroscopy (ICP-OES) and colorimetry in soil extracts is termed molybdate-unreactive P (MU-P). The dynamics and characterization of MU-P in natural environments remain not fully elucidated, making it essential to understand how different extractants for available P influence MU-P levels and which soil attributes and P forms are associated with this pool. This study compared three extractants used in soil P tests for their ability to access MU-P, explored associations between soil chemical attributes and MU-P, and evaluated whether there is a relationship between P species obtained by XANES and MU-P in soils of contrasting nature. To achieve this, 28 representative soils were collected in non-cultivated forestry areas (native or reforested), which had never received anthropogenic P inputs. On average, Mehlich-3 extracted the highest amounts of MU-P; however, the correlations between Mehlich-3 MU-P with other chemical attributes were weaker than those observed for Mehlich-1 and resin. XANES analysis did not reveal a clear relationship between MU-P levels and P-species in the soil samples. Among soil attributes, organic carbon (OC) displayed the strongest correlations with MU-P, which highlights its potential as a predictive attribute for MU-P in natural environments. Managing OC in soils could influence MU-P levels, affecting phosphorus availability for plants. To this end, it is important to consider the P extractant, with Mehlich-1 and resin being better options in relation to Mehlich-3. There are limitations to XANES K-edge in effectively capturing the complexity of MU-P in soil samples. (AU)

• Processo FAPESP: 17/15331-3 - Alterações na ciclagem e acúmulo de C induzidos pela intensificação e diversificação do sistema de manejo da pastagem
• Beneficiário: Júnior Melo Damian
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 22/08629-4 - Modelagem de sistemas integrados cana-de-açúcar/pecuária no Brasil
• Beneficiário: Júnior Melo Damian
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/08586-8 - Aplicação superficial de calcário e de fosfogesso e formas de fósforo em um latossolo sob semeadura direta
• Beneficiário: Ruan Francisco Firmano
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/01213-4 - Técnicas espectroscópicas na avaliação de espécies de fósforo em um Latossolo e minerais do solo
• Beneficiário: Ruan Francisco Firmano
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado