Distribuição do carbono orgânico em Latossolo sob manejo da adubação fosfatada em plantio direto no Cerrado

• Autor(a) principal: Jerke, Caroline
• Data de Publicação: 2012
• Outros Autores: Sousa, Djalma Martinhão Gomes de, J. Goedert, Wenceslau
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/10123
• topic: fosfato natural reativo; matéria orgânica do solo; modo de aplicação; qualidade do solo; superfosfato triplo; reactive natural phosphate; soil organic matter; application method; soil quality; triple superphosphate

The objective of this work was to evaluate the vertical and horizontal distribution of soil organic carbon (SOC) under five managements of phosphate fertilizer in a no‑tillage system. The experiment was established on a Rhodic Haplustox, cultivated with soybean or corn for eight years, with millet as cover crop during the off-season. Plots were subjected to the following treatments: triple superphosphate in the sowing furrow or on surface, reactive natural phosphate on the sowing furrow or on surface, and without the addition of phosphate fertilizer (control). Phosphate fertilizer was applied annually at a dosage of 80 kg ha‑1 of P2O5 on soil initially with a low phosphorous content. Samples were collected perpendicularly to the sowing line in seven sites distanced at 12.5 cm, and in five layers: 0–2.5, 2.5–5.0, 5.0–10, 10–20, and 20–30 cm. The content and the distribution of SOC are vertically and horizontally affected by phosphate fertilization, with highercontents in treatments with phosphate fertilizers. Compared to the control treatment, triple superphosphateshowed higher SOC concentrations until the 5.0–10‑cm layer, and reactive natural phosphate until 10–20 cm. Phosphorus application in furrows provides greater volume of soil with suitable levels of SOC, compared to broadcast application.