Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/10686
Title: Phosphorus fractions and availability in a haplic plinthosol under no-tillage system in the brazilian cerrado
Other Titles: Frações e disponibilidade de fósforo em um plintossolo haplico sob sistema de plantio direto no cerrado
Keywords: Phosphorus adsorption
Available phosphorus
Tillage system
Adsorção de fósforo; fósforo disponível; sistema plantio direto.
Issue Date: 1-May-2015
Publisher: Universidade Federal de Lavras
Citation: ROTTA, L. R. et al. Phosphorus fractions and availability in a haplic plinthosol under no-tillage system in the brazilian cerrado. Ciência e Agrotecnologia, Lavras, v. 39, n. 3, p. 216-224, May/Jun. 2015.
Abstract: Soil use and fertilizer management as well as cropping systems influence phosphorus (P) availability in the soil. This study evaluated P fractions and availability in a chronosequence of anthropic influence in a Haplic Plinthosol, in sites under no-till for different time periods: seven (NT7), eleven (NT11), and sixteen (NT16) years. Labile P concentrations in the soil accounted for 10%, 8%, and 9% of the total P for treatments NT7, NT11, and NT16, respectively. The labile P values ranged between 99 and 122 mg dm-3andindicatied no time in no-tillage influence on labile P under in the studied Plinthosol. However, moderately labile P contents increased with time: NT7 < NT11 < NT16 (237, 341, and 375 mg dm-3, respectively). This increased followed the elevation in iron oxide contents, indicating a relationship between mineralogy and P accumulation. Regardless of no-tillage period, P contents extracted by Mehlich-1 were lower, underestimating the available P content, when compared with the extraction using a P selective resin. The stocks of labile P were sufficient to maintain high crop yields, according to the recommendations for the Cerrado region. Even if labile P contents are reduced, when adopting no-till system, the contents and stocks of P in the soil after several years were high enough to provide for adequate crop yields.
URI: http://dx.doi.org/10.1590/S1413-70542015000300002
http://repositorio.ufla.br/jspui/handle/1/10686
Appears in Collections:DCS - Artigos publicados em periódicos



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