Ácidos orgânicos de baixa massa molar em solos e materiais orgânicos

Pinheiro, Gabriela Lúcia; Silva, Carlos Alberto; Lima, José Maria de; Costa, Adriana Monteiro da; Saczk, Adelir Aparecida

doi:10.1590/s0100-40422013000300011

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…Table 1 shows the main chemical and physicochemical properties of the organic material used in the study; these data were compiled by Pinheiro et al (2013). The macronutrient and micronutrient levels of some of the residues were reported by Higashikawa et al (2010).…”

Section: Methodsmentioning

confidence: 99%

Soluble carbon in oxisol under the effect of organic residue rates

Pinheiro

Silva²,

Lima³

2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe application of organic residues to the soil can increase soluble organic carbon (SOC) and affect the pH and electrolytic conductivity (EC) of the soil. However, the magnitude of these changes depends on the type of residue and the applied dose. This study aimed to evaluate the effect of increasing C rates contained in organic residue on the pH, EC, water-extractable total carbon (WETC), waterextractable organic carbon (WEOC), and water-extractable inorganic carbon (WEIC) in soil treated with manure (chicken, swine, and quail), sawdust, coffee husk, and sewage sludge. The levels of total C (TC-KH 2 PO 4 ), organic carbon (OC-KH 2 PO 4 ), and inorganic C (IC-KH 2 PO 4 ) extractable by a 0.1 mol L -1 KH 2 PO 4 solution were also quantified in soil under the effect of increasing rates of chicken and quail manures. The following rates of organic residue C were applied to a dystrophic Red Latosol (Oxisol) sample: 0, 2,000, 5,000, 10,000, and 20,000 mg kg -1 . The addition of organic residues to the soil increased pH, except in the case of sewage sludge, which acidified the soil. The acidity correction potential of chicken and quail manure was highest, dependent on the manure rate applied; regardless of the dose used, sawdust barely alters the soil pH. At all tested rates, the EC of the soil treated with swine manure, coffee husk, and sawdust remained below 2.0 dS m -1 , which is a critical level for salinity-sensitive crops. However, the application of chicken or quail manure and sewage sludge at certain rates increased the EC to values above this threshold level. Highest levels of WETC, WEOC, and WEIC were obtained when chicken and quail manure and coffee husk were applied to the Oxisol. The quantities of SOC extracted by KH 2 PO 4 were higher than the quantities extracted by water, demonstrating the ability of soil to adsorb C into its colloids.Index terms: soluble organic carbon, manure, electrolytic conductivity, soil acidity, crop residues, carbon adsorption.( RESUMO: CARBONO SOLÚVEL EM LATOSSOLO SOB EFEITO DE DOSES DE RESÍDUOS ORGÂNICOSA adição de resíduos orgânicos pode aumentar o carbono orgânico solúvel (COS) e alterar o pH e a condutividade elétrolítica (CE) do solo, mas a magnitude dessas variações depende do resíduo e de sua dose aplicada. Objetivou-se avaliar o efeito de doses de carbono pela adição de resíduos orgânicos sobre o pH, a CE, o carbono total extraível por água (CTEA), o carbono orgânico extraível por água (COEA) e o carbono inorgânico extraível por água (CIEA), em solo tratado com estercos (galinha, suíno e codorna), serragem, casca de café e lodo de esgoto. Os teores de C total (CT-KH 2 PO 4 ), C orgânico (CO-KH 2 PO 4 ) e C inorgânico (CI-KH 2 PO 4 ) extraível por solução de KH 2 PO 4 0,1 mol L -1 também foram quantificados em solo sob efeito de doses crescentes de estercos de galinha e de codorna. O solo utilizado foi o Latossolo Vermelho distroférrico (LVdf) e as doses de C-resíduo orgânico constituíram-se de 0, 2.000, 5.000, 10.000 e 20.000 mg kg -1 . A adição de resíduos org...

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Section: Methodsmentioning

confidence: 99%

Soluble carbon in oxisol under the effect of organic residue rates

Pinheiro

Silva²,

Lima³

2014

Rev. Bras. Ciênc. Solo

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“…Thus, even in an environment rich in organic matter, the effect of organic compounds in solubilizing P-apatite is overcome by other chemical factors, such as the high pH values and Ca contents in the compost pile. Although chicken manure (CM) has greater content of low molecular weight organic acids than other wastes (Pinheiro et al, 2013), the alkaline characteristic and the high Ca content, especially in the form of CaCO 3 of this waste (Higashikawa et al, 2010), may also explain the low P-PR solubilization after 150 days of composting.…”

Section: Compost P Fractionsmentioning

confidence: 99%

“…Thus, Brazilian coffee farmers have been mixing phosphate rock (PR) in composting piles with coffee husk (CH) and chicken manure (CM) as a way of producing OMFs, though they do not know the efficiency of this process for the solubilization of P from PR (P-PR). During composting, not only humic substances are produced, but also low molecular weight organic acids found in CM (Pinheiro et al, 2013). Organic acids are also synthesized by microorganisms in composting piles, and these organic substances can complex the Ca, Fe, and Al of the PR, destabilizing the apatite from PR and increasing P solubility (Welch et al, 2002;Vassilev et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Is Composting a Route to Solubilize Low-Grade Phosphate Rocks and Improve MAP-Based Composts?

Maluf

Silva

Morais

et al. 2018

Rev. Bras. Ciênc. Solo

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“…The decomposition of organic residues and part of soil organic matter can provide low-molecular-weight organic acids (Pinheiro et al, 2013), increasing the efficiency of P for plants, especially by inhibiting P adsorption to the reactive sites of the soil (Yang et al, 2013). Several studies have demonstrated the formation of metal-organic materials complexes, which eventually reduces the activity of the metal in the solution (Guppy et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Formation of ternary organic acids-Fe-P complexes on the growth of wheat (Triticum aestivum)

Schmitt

Gatiboni

Orsoletta

et al. 2018

Rev. bras. eng. agríc. ambient.

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Phosphorus (P) reacts with chemical and mineralogical constituents in the soil, mainly in tropical and subtropical soils. Therefore, strategies have been used to reduce the adsorption of P to the soil, among them, the formation of complexes that could decrease P adsorption to the soil. Two experiments were carried out to evaluate the formation of organic acid-Fe-P complexes in the laboratory and the efficiency of these complexes on the growth of wheat plants (T. aestivum) grown under greenhouse conditions. In experiment 1, seven low-molecular-weight organic acids (OA) were selected and a protocol for the formation of complexes between organic acid and Fe3+ at pH 4.0 was performed. After stirring, P was added to the organic acid-Fe complex to form the ternary complex. The remaining P was evaluated to determine the amount of P in the complex. In experiment 2, the three OAs which had the largest amount of complexes were selected, together with a treatment with soluble P and a control. Wheat was grown in potted soil in a greenhouse for 34 days. The amount of ternary organic acid-Fe-P complexes formed varied from 5 to 42% of the added P. However, when these complexes were added to the soil, in treatments with greater amount of complex formed there was lower growth of wheat. Thus, the ternary complex with organic acid-Fe-P has little effect on the performance of wheat plants.

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Ácidos orgânicos de baixa massa molar em solos e materiais orgânicos

Cited by 10 publications

References 24 publications

Soluble carbon in oxisol under the effect of organic residue rates

Soluble carbon in oxisol under the effect of organic residue rates

Is Composting a Route to Solubilize Low-Grade Phosphate Rocks and Improve MAP-Based Composts?

Formation of ternary organic acids-Fe-P complexes on the growth of wheat (Triticum aestivum)

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