Correlação entre o fósforo extraído de solos por diversos extratores químicos e o absorvido pelo milho

Raij, Bernardo van; Feitosa, Celi Teixeira

doi:10.1590/s0006-87051980000100007

Cited by 4 publications

(2 citation statements)

References 6 publications

(4 reference statements)

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“…Chemical analyses included pH, sorption complex, organic C, and micronutrients. P availability was evaluated by Mehlich-1 (Claessen, 1997) and ion exchange resin (Raij & Feitosa, 1980). Total free Fe oxides and less crystalline Fe oxides in clay fraction were obtained by means of dithionite-citrate-sodium bicarbonate (Fe d ) (Mehra, 1960) and ammonium acid oxalate (Fe o ) (Schwertman, Kodama, & Fisher, 1986), respectively.…”

Section: Methodsmentioning

confidence: 99%

Phosphorus Fractions and Their Transformations in Entisol

Alovisi¹,

Alovisi²,

Serra³

et al. 2018

JAS

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The availability of phosphorus in the soil is a factor that directly interferes with its absorption by plants. This availability can be influenced by the texture, dose of the phosphate fertilizer and the time of contact with the soil. This study aimed to quantify the organic and inorganic fractions of P accumulated in a sandy soil receiving doses of phosphorus, incubated and grown with rice. The experimental design was a completely randomized design, in a 4 × 3 factorial scheme, with four replicates, and four P doses (0, 80, 240, and 410 mg dm-3) and three evaluation times (before sowing, after harvest, and incubated). Soil samples were collected before, after incubation, and after rice harvesting, and then submitted to a chemical fractionation of P. P fractions were influenced by soil collection times. The inorganic fractions prevailed before sowing and after incubation, and the organic fractions prevailed after harvest. Phosphate fertilization favored mineralization of organic P and redistributes the inorganic and organic P fractions, between labile and non-labile compartments. The application of phosphate fertilizer in an Entisol Quartzipsamment contributes to the accumulation of inorganic fractions, especially in the most labile fractions.

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Section: Methodsmentioning

confidence: 99%

Phosphorus Fractions and Their Transformations in Entisol

Alovisi¹,

Alovisi²,

Serra³

et al. 2018

JAS

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show abstract

“…Chemical analyses included pH, sorption complex, organic C, macronutrients and micronutrients content. Phosphorus (P) availability was measured using Mehlich-1 extractor (Claessen, 1997) and ion-exchange resin (Raij & Feitosa, 1980). Free Fe oxy-hydroxides from clay fraction were obtained by dissolution with dithionite-citratebicarbonate (Fed) (Mehra & Jackson, 1960).…”

Section: Soil Properties Evaluationsmentioning

confidence: 99%

Dynamic of Phosphorus Fractions in Typic Quartzipsamment Soil Cropped With Bean

Alovisi¹,

Serra²,

Alovisi³

et al. 2018

JAS

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Phosphorus is the most limited nutrient in Brazilian soils for plant growth, resulted of low availability and poor P content in bedrock. The aim of the study was to evaluate the dynamic of P fractions in a sand soil typical Quartzipsamment cropped with common bean under the effects of P and Si-fertilizer rates. The research was carried out in a soil with sand texture and clay mineralogy constituted mainly by kaolinite, classified as Neossolo Quartzarenico Ortico típico (RQo). The greenhouse location was the campus of Universidade Federal de Lavras located in the city of Lavras, state of Minas Gerais, Brazil (approximately 21o13'46.54" S and 44o58'26.30" W, average altitude 932 m above sea level). The experimental design used was entirely random, arranged in a 4 × 3 factorial design, with four repetitions, with amount of 48 experimental units. The treatments included four P rates (0, 80, 240 and 410 mg dm-3) and four Si rates (0, 240 and 410 mg dm-3). Phosphorus fractions in soil are little affected by Si-fertilizer rates. P uptakes by bean plants are correlated to the labile and moderately labile fractions. P-fertilizer rates increment majority the stable P fraction in soil and in lower proportion the labile and moderately labile P fractions in soil. Po-NaHCO3 is the only that contributes to bean plant nutrition.

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Frações de fósforo em Latossolos

Silva¹,

Nóbrega²,

Curi³

et al. 2003

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi verificar se o histórico de uso, adubação fosfatada, inoculação micorrízica e cultivo com braquiária e soja, em casa de vegetação, alteram as frações de P em três Latossolos. Foi determinado o P ligado a Al (P-Al), Fe (P-Fe) e Ca (P-Ca) e as frações de P separadas com resina, NaHCO 3 , NaOH, HCl e digestão com H 2 SO 4 e H 2 O 2 . As frações orgânicas e inorgânicas foram separadas por autoclavagem. No Latossolo Amarelo coeso (LAx) e Latossolo Vermelho ácrico (LVw), o P-Al, P-Fe e P-Ca foram maiores nos solos cultivados, e no Latossolo Vermelho distroférrico (LVdf) o P-Al e P-Fe foram maiores nos solos não cultivados, tendências não alteradas pelo cultivo com braquiária e soja. A adição de P elevou principalmente as frações inorgânicas lábeis (Pi-resina e Pi-NaHCO 3 ) e moderadamente lábil (Pi-NaOH). Solos anteriormente cultivados tiveram menos P nas frações orgâni-cas do que os não cultivados. Nos solos com braquiária, verificou-se menos P nas frações pouco lábeis e mais nas frações mais lábeis. O efeito da micorriza foi menor e menos consistente do que o cultivo e aplicação de fósforo.Termos para indexação: Brachiaria decumbens, Glycine max, adubo fosfatado, fungo micorrízico. Phosphorus fractions in OxisolsAbstract -The objective of this work was to verify if the historical use, phosphorus fertilization, mycorrhizal inoculation and cultivation with brachiaria and soybeans in greenhouse alter P fractions in three Oxisols. P linked to Al (P-Al), Fe (P-Fe), and Ca (P-Ca) were determined. The P fractions were separated with resin, NaHCO 3 , NaOH, HCl, and digestion with H 2 SO 4 and H 2 O 2 . The organic and inorganic fractions were separated by autoclaving. In the cohesive Yellow Latosol (LAx) and acric Red Latosol (LVw), the P-Al, P-Fe, and P-Ca were higher in the cultivated soils, and in the dystroferric Red Latosol (LVdf), the P-Al and P-Fe were higher in the non-cultivated soils, trends non-altered by the cultivation with brachiaria and soybeans. P addition elevated mainly the labile inorganic (Pi-resin and Pi-NaHCO 3 ) and the moderately labile (Pi-NaOH) fractions. Soils formerly cultivated presents less P in the organic fractions than the non-cultivated ones. In soils with brachiaria, less P in the less labile fractions and more P in the more labile ones were verified. The effect of mycorrhizae was smaller and less consistent than the cultivation and P application.

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Correlação entre o fósforo extraído de solos por diversos extratores químicos e o absorvido pelo milho

Cited by 4 publications

References 6 publications

Phosphorus Fractions and Their Transformations in Entisol

Phosphorus Fractions and Their Transformations in Entisol

Dynamic of Phosphorus Fractions in Typic Quartzipsamment Soil Cropped With Bean

Frações de fósforo em Latossolos

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