Frações e disponibilidade de fósforo em um plintossolo haplico sob sistema de plantio direto no cerrado
| Autor: | Marco Aurélio Carbone Carneiro, Helder Barbosa Paulino, Guilherme Lopes, Ibanor Anghinoni, Edicarlos Damacena de Souza, Leonardo Ricardo Rotta |
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| Rok vydání: | 2015 |
| Předmět: |
sistema plantio direto
General Veterinary Crop yield Chronosequence Phosphorus Extraction (chemistry) Soil Science chemistry.chemical_element Adsorção de fósforo engineering.material lcsh:S1-972 available phosphorus Tillage Agronomy chemistry engineering Animal Science and Zoology fósforo disponível Fertilizer lcsh:Agriculture (General) tillage system Agronomy and Crop Science Phosphorus adsorption Food Science |
| Zdroj: | Ciência e Agrotecnologia, Vol 39, Iss 3, Pp 216-224 (2015) Ciência e Agrotecnologia, Volume: 39, Issue: 3, Pages: 216-224, Published: JUN 2015 Ciência e Agrotecnologia v.39 n.3 2015 Ciência e Agrotecnologia Universidade Federal de Lavras (UFLA) instacron:UFLA |
| ISSN: | 1981-1829 1413-7054 |
| Popis: | 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. Uso do solo e manejo da adubação, bem como sistemas de cultivo influenciam fósforo (P) disponíveis no solo. Neste estudo, avaliaram-se as frações de P e disponibilidade em cronossequência de interferência antrópica em um Plintossolo Háplico com sete (NT7), onze (NT11) e dezesseis (NT16) anos de sistema de plantio direto. Concentrações lábeis de P, no solo, foram responsáveis por 10, 8 e 9 % do total de P para os tratamentos NT7, NT11 e NT16, respectivamente, variando entre 99 e 122 mg dm-3, indicando que não houve influência do tempo em plantio direto. No entanto, os teores de P moderadamente lábil aumentou com o tempo: NT7 |
| Databáze: | OpenAIRE |
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