Carbono, matéria orgânica leve e fósforo remanescente em diferentes sistemas de manejo do solo

Pereira, Marcos Gervásio; Loss, Arcângelo; Beutler, Sidinei Júlio; Torres, José Luis Rodrigues

doi:10.1590/s0100-204x2010000500010

Cited by 46 publications

(40 citation statements)

References 23 publications

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“…K can be applied through the conventional method, which consists in the application of the fertilizer directly in the soil along the sowing row (Sousa et al, 2013), and through fertigation, which reduces the costs with labor in fertilization and increases the efficiency of the mineral element in the soil management (Pereira et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Potassium fertilization via fertigation and conventional application on quality of tomato fruits

Neto

Azevedo

Viana

et al. 2016

Rev. bras. eng. agríc. ambient.

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The tomato crop plays an important environmental, economic and even social role, especially for creating employment and income. The present work aims to evaluate the effects of potassium (K) drip fertigation and of conventional K fertilization on the tomato crop quality. The experiment was conducted under field conditions, in the period between August 2011 and December 2011, in Fortaleza, CE, Brazil. The experimental design was in randomized blocks in a factorial arrangement and the treatments corresponded to doses (D1 = 200, D2 = 400 and D3 = 800 kg K2O ha-1) and K fertilizing methods (F1 - Fertigation and F2 - Conventional fertilization), plus an additional control (without K fertilization) for each fertilizing method, with four replicates. The following variables were analyzed: fruit firmness (FF), soluble solids content (SS), titratable acidity (TA), pH and SS/TA ratio. K fertilization through fertigation (400 kg K2O ha-1) increases SS and the SS/TA ratio of the tomato fruits. Thus, K fertigation is the most promising method, since it allows the use of a lower K dose.

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Section: Introductionmentioning

confidence: 99%

Potassium fertilization via fertigation and conventional application on quality of tomato fruits

Neto

Azevedo

Viana

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…F-forest; C1-capoeira 1; C2-capoeira 2; P1-pasture degraded 1; P2-pasture degraded 2; P3-pasture degraded 3 e P4-pasture degraded 4. POC: particulate organic C; MAOC: Mineral-associated organic C Although, the labile organic matter pools has been recommended as sensitive to soil management (Conceição et al, 2005;Souza et al, 2006;Pereira et al, 2010) and recommended as indicators for small variation of degradation, in the present study this compartment was not sensitive to the levels of pastures established. It is possible to note the differences between the conversions uses, but in pastures small differences were verified.…”

Section: In Sites Of Pastures Under Different Managements the Highesmentioning

confidence: 59%

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Donagemma

Andrade²,

Passos³

et al. 2013

JAS

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In Brazil, a large part of the Atlantic Forest was deforested in pastures, which were developed on the basis of natural fertility and organic matter content of the new deforested soil. However, as time went by the organic matter content in these areas have been decreasing causing soil degradation. The objective of this study was to evaluate the organic matter as a quality indicator of Ultisols in different levels of pasture degradation in the region of Governador Valadares-MG. Four sites of pastures were chosen at different levels of degradation, observed visually, two capoeiras in different stages of natural recovery and forest site (reference). Soil samples were collected at three depths (0.00-0.05, 0.05-0.10 and 10-0.20 m) in two seasons of the year (rainy and dry seasons) in the middle third of the landform with three replicates. The following attributes were determined: soil organic C, free light fraction, particulate organic matter, particulate organic C, mineral-associated organic C and dissolved organic matter. The experimental results showed that the soil organic matter appeared efficient in discriminating soil quality between degraded forest/pasture, as well as between degraded capoeira/pasture. But, it was not sensitive to discriminate within levels of degraded pastures. Among the organic matter pools studied, the most sensitive soil quality indicators were: particulate organic matter and dissolved organic matter, in the following degraded order verified from these indicators: forest < capoeira 1 = capoeira 2 < pastures (1, 2, 3 and 4).

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“…Some authors have reported that due to the anionic nature of OM, P adsorption may occur via cation bridges, to which aluminum, iron, and calcium are adsorbed (NOVAIS;SMYTH, 1999;MOREIRA et al, 2006). Nevertheless, other studies have shown a negative contribution of OM aimed at reducing P adsorption by means of organic acids that block adsorption sites (GUPPY et al, 2005;FONTANA et al, 2008;PEREIRA et al, 2010).…”

Section: A --------------------------------------Po Hid 01 (Mg Kg -1mentioning

confidence: 99%

Phosphorus Forms and Adsorption in a Typic Quartzipsamment Cultivated With Sugarcane Harvested Without Burning

et al. 2017

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-The objective of this study was to evaluate the adsorption of phosphorus (P) and changes in the concentrations of organic and inorganic forms of P in a Neossolo Quartzarênico (Typic Quartzipsamment) after 9 years of successive cultivation with sugar cane without burning to harvest. Therefore, two areas, one in which cane sugar was planted and a native forest reference area, located in the municipality of Paraipaba-CE, were selected. In each area, samples were collected at depths of 0−0.025, 0.025−0.05, 0.05−0.10, 0.10−0.20, and 0.20−0.30 m, and the levels of organic (Po) and inorganic (Pi) phosphorus obtained by sequential extraction, the remaining phosphorus, and the maximum adsorption capacity of phosphorus by the soil were determined. In general, the permanence of straw on the soil surface under sugarcane cultivation promoted the maintenance of Po levels in the surface layers of the profile. The Po accumulated predominantly in the Po fraction extracted with sodium bicarbonate in both areas. Regarding the Pi content, changes were more evident during cultivation due to the effect of successive phosphate fertilizer applications. The fraction extracted with 0.1 mol L -1 sodium hydroxide was the most representative, with the highest levels of P uptake. P adsorption was influenced by the initial content of the nutrient in the soil and no relationship between P adsorption and organic matter content was observed. The highest level of adsorption was observed in the bottom layer of the forest area (133.3 mg kg -1 ) and the lowest level of adsorption was observed on the surface layer of the area under sugarcane cultivation (59.5 kg mg -1 ).Keywords: Sequential extraction. Sorption. Sandy soil. FORMAS DE FÓSFORO E ADSORÇÃO EM NEOSSOLO CULTIVADO COM CANA-DE-AÇUCAR COLHIDA SEM QUEIMARESUMO -O presente trabalho teve como objetivo avaliar a adsorção de fósforo (P) e as mudanças ocorridas nas concentrações das formas orgânicas e inorgânicas de P em um Neossolo Quartzarênico após nove anos de cultivo sucessivos com cana-de-açúcar sem queima prévia do canavial para colheita. Para tanto, duas áreas, plantio de cana-de-açúcar e mata nativa de referência, situadas no município de Paraipaba-CE, foram selecionadas. Em cada uma das áreas foram coletadas amostras nas profundidades de 0 -0,025; 0,025 -0,05; 0,05 -0,10; 0,10 -0,20 e 0,20 -0,30 m; determinando-se os teores de fósforo orgânico (Po) e inorgânico (Pi) obtidos através de extração sequencial, o fósforo remanescente (Prem) e a capacidade máxima de adsorção de fósforo (CMAP) do solo. De maneira geral, a permanência da palhada na superfície do solo sob cultivo de cana -de-açúcar promoveu a manutenção dos níveis de Po nas camadas superficiais do perfil. O Po acumulou-se predominantemente na fração biodisponível extraído com bicarbonato de sódio nas duas áreas. Com relação ao conteúdo de Pi, as mudanças foram mais evidentes devido ao efeito das sucessivas aplicações de fertilizantes fosfatados ao longo do cultivo, sendo a fração extraída com hidróxido de sódio 0,1 mol L ...

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Carbono, matéria orgânica leve e fósforo remanescente em diferentes sistemas de manejo do solo

Cited by 46 publications

References 23 publications

Potassium fertilization via fertigation and conventional application on quality of tomato fruits

Potassium fertilization via fertigation and conventional application on quality of tomato fruits

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Phosphorus Forms and Adsorption in a Typic Quartzipsamment Cultivated With Sugarcane Harvested Without Burning

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