Organic compounds from plant extracts and their effect on soil phosphorus availability

• Autor(a) principal: Pavinato, Paulo Sergio
• Data de Publicação: 2008
• Outros Autores: Merlin, Alexandre, Rosolem, Ciro Antonio
• 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/854
• topic: Raphanus sativus; cover crops; crop rotation; labile phosphorus; low‑molecular‑weight organic acids; phosphorus fractionation; Raphanus sativus; culturas de cobertura; rotação de culturas; fósforo lábil; ácido orgânico de baixa massa molecular; fracionamento de fósforo

The objective of this work was to evaluate the effect of organic compounds from plant extracts of six species and phosphate fertilization on soil phosphorus availability. Pots of 30 cm height and 5 cm diameterwere fi lled with Typic Hapludox. Each pot constituted a plot of a completely randomized design, in a 7x2 factorial arrangement, with four replicates. Aqueous extracts of black oat (Avena strigosa), radish (Raphanus sativus), corn (Zea mays), millet (Pennisetum glaucum), soybean (Glycine max), sorghum (Sorghum bicolor), and water, as control, were added in each plot, with or without soluble phosphate fertilization. After seven days of incubation, soil samples were taken from soil layers at various depths, and labile, moderately labile andnonlabile P fractions in the soil were analysed. Plant extracts led to an accumulation of inorganic phosphorus in labile and moderately labile fractions, mainly in the soil surface layer (0–5 cm). Radish, with a higher amount of malic acid and higher P content than other species, was the most effi cient in increasing soil P availability.