Forms of phosphorus in an oxisol under different soil tillage systems and cover plants in rotation with maize

Carvalho, Arminda Moreira de; Bustamante, Mercedes M. C.; Almondes, Zayra Azeredo do Prado; Figueiredo, Cícero Célio de

doi:10.1590/s0100-06832014000300029

Cited by 13 publications

(10 citation statements)

References 15 publications

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“…M. Carvalho et al (CARVALHO et al, 2012;TALBOT et al, 2012), could have caused the higher C/P ratios found for this species at depths of 0-5 cm during the dry season. Higher C/P ratios in the 0-5 cm soil layer compared to the 5-10 cm layer were caused by lower levels of available P at 0-5 cm compared to at 5-10 cm layer, and by much higher concentration of carbon at the soil surface caused by the accumulation of plant residues, principally maize straw (CARVALHO et al, 2014).…”

Section: Resultsmentioning

confidence: 94%

Characterization of cover crops by NMR spectroscopy: impacts on soil carbon, nitrogen and phosphorus under tillage regimes

Carvalho¹,

Marchão²,

Bustamante³

et al. 2014

Rev. Ciênc. Agron.

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Section: Resultsmentioning

confidence: 94%

Characterization of cover crops by NMR spectroscopy: impacts on soil carbon, nitrogen and phosphorus under tillage regimes

Carvalho¹,

Marchão²,

Bustamante³

et al. 2014

Rev. Ciênc. Agron.

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“…With the progressive increase in world soybean production it became necessary to find alternative cultivation, such as the implementation of a no-tillage system which can increase soil productivity in a sustainable and economical way by promoting improvements in physical, chemical and biological attributes, helping to protect the soil from erosion and irradiation, besides conserving moisture and providing nutrient cycling, which motivates farmers to use green manure in crop succession and rotation systems (Carvalho et al 2014;Simonetti et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Allelopathic Action of the Níger (Guizotia abyssinica Cass.) on Soybean (Glycine max (L.) Merrill)

Devequi

Freitas

Libório

et al. 2020

JAS

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Soybean (Glycine max (L.) Merrill) is an agricultural crop with a large increase in production in the last three decades and is an essential component in the manufacture of animal and human food. Understanding the interactions between crop and other plant species used as green manure that can improve yield and so reduce environmental damage. Forages can release secondary metabolites in the environment that influence in a beneficial or harmful way to other plants, characterizing the allelopathy process. The Níger (Guizotia abyssinica Cass.) is used in agricultural systems because it releases allelochemicals, especially flavonoids. Therefore, this study is aimed to evaluate the allelopathic effects of the Niger straw on the germination and initial growth of soybean seedlings. The treatments consisted of aqueous extracts of niger stems, leaves and roots in different concentrations (0; 25; 50; 75 and 100%). For each treatment, five replications were performed, each composed by a 25 seeds distributed in gearbox kept in incubator chamber for 7 days at 25ºC and 12 hours photo period. The experimental design was completely randomized and the data were evaluated by analysis of variance and the means of treatments compared by Tukey’s test at 5% significance. The results show a reduction in germination and initial growth of soybean seedlings submitted to aqueous extract of niger stem and roots. In contrast, the aqueous extract of the Niger leaves increased the length of soybean seedlings. The allelopathic effects of the Niger probably occur due to the presence of flavonoids in the tissues of this plant species.

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“…O fósforo total (Pt) no solo é constituído por distintas formas em diferentes graus de disponibilidade às plantas, tais como, inorgânica (Pi) e orgânica (Po), esta última, presente em resíduos de plantas, esterco e tecidos microbianos. O fracionamento químico do P representa uma aproximação dos compartimentos biológicos e geoquímicos que regulam a dinâmica do P orgânico e inorgânico no solo (Carvalho et al, 2014). Através das extrações sequenciais primeiro são obtidas as frações mais lábeis.…”

Section: Introductionunclassified

Fósforo em agregados biogênicos e fisiogênicos sob diferentes sistemas de manejo agroecológico

et al. 2019

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O objetivo desse estudo foi determinar os teores de fósforo total (PT) e de suas formas e frações (Pt-bic, Pi-bic, Po-bic, Pt-H+ , Pi-H+ , Po-H+ , Pt-OH- , Pi-OH- e Po-OH- ), em agregados biogênicos e fisiogênicos sob diferentes sistemas de manejo agroecológico, no município de Seropédica-RJ. Foram abertas trincheiras com dimensões aproximadas de 0,25 x 0,20 m, em seguida foram coletados blocos de solos nas áreas amsotrais: sistema agroflorestal (SAF); café em pleno sol (C-SOL); café sombreado (C-SOM); cultivo em aleias de flemíngia/vagem (AL-FLE) e plantio direto com milho/ (PD) com 6 anos de cultivo; em 3 camadas (0,00-0,05; 0,05-0,10 e 0,10-0,20 m) com 4 pseudorepetições em delineamento inteiramente casualizado. Após a coleta, as amostras foram submetidas a tamisação em conjunto de peneiras de 9,7 - 8,0 mm. Foram utilizados para a identificação das vias de formação os agregados retidos neste único intervalo. Estes foram examinados sob lupa e separados manualmente e classificados em: biogênicos – aqueles que apresentaram formas arredondadas; e fisiogênicos – definidos com formas angulares. O PT foi determinado via digestão sulfúrica, e as formas e frações de P foram extraídas em sequência com NaHCO3, H2SO4 e NaOH. O PT e as suas formas e frações foram determinadas por colorimetria após a redução do complexo fosfomolibídico com ácido ascórbico. Os resultados foram submetidos à análise de variância com aplicação do teste de agrupamento de médias de Scott Knott (p<0,05). Nos agregados fisiogênicos foram verificados os maiores teores de Pt-bic, Po-bic, Pt-H+ , Pi-H+ , Po-H+ e Po-OH- em comparação aos agregados da via biogênica na maioria das áreas estudadas. As concentrações de P encontradas nos diferentes tipos de agregados evidenciaram o importante papel das vias de formação na avaliação da qualidade do solo e que todas as áreas avaliadas possuíam capacidade de se auto sustentar em relação à nutrição fosfatada.

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Forms of phosphorus in an oxisol under different soil tillage systems and cover plants in rotation with maize

Cited by 13 publications

References 15 publications

Characterization of cover crops by NMR spectroscopy: impacts on soil carbon, nitrogen and phosphorus under tillage regimes

Characterization of cover crops by NMR spectroscopy: impacts on soil carbon, nitrogen and phosphorus under tillage regimes

Allelopathic Action of the Níger (Guizotia abyssinica Cass.) on Soybean (Glycine max (L.) Merrill)

Fósforo em agregados biogênicos e fisiogênicos sob diferentes sistemas de manejo agroecológico

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