Influência da matéria orgânica na capacidade de troca de cations do solo

Verdade, Francisco da Costa

doi:10.1590/s0006-87051956000100004

Cited by 13 publications

(9 citation statements)

References 7 publications

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“…Verdade (29), eliminando a matéria orgânica de amostras de solos do Estado de São Paulo com o peróxido de hidrogênio, considerou haver um teor crítico, abaixo do qual a fração orgâ-nica inibe a C.T.C. da fração mineral.…”

Section: -Resultados E Discussãounclassified

A capacidade de troca de catíons das frações orgânica e mineral em solos

Raij

1969

Bragantia

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Foi estudada a capacidade de troca de cations (C.T.C.), da matéria orgânica e da fração mineral, em 103 amostras de 22 perfis de solos do Estado de São Paulo. A C.T.C. da matéria orgânica variou de 190 a 400 e.mg por 100 g, em amostras superficiais, e de 160 a 490 em subsuperficiais. Verificou-se estreita correlação entre a C.T.C. da matéria orgânica e o pH dos solos. A C.T.C. da fração mineral no horizonte B variou entre 2,7 e 20,0 e.mg. Em média, a contribuição da matéria orgânica à C.T.C. foi de 74% para amostras superficiais. Atingiu a 58% para os horizontes A2 e A3, a 47% para o B1 e a 35% para B2 e B22.

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Section: -Resultados E Discussãounclassified

A capacidade de troca de catíons das frações orgânica e mineral em solos

Raij

1969

Bragantia

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“…With respect to the variable CEC, it was possible to observe (Figure 4c) that 66% of the samples presented average contents and 30% showed contents considered high. This effect occurred possibly owing to the presence of high values of pH in the region, which contributes to the formation of negative electric charges with consequent increase in CEC, or else, because of the high levels of OM found in the present study, considering that it is responsible for 36 to 58% of the CEC and influences the overall balance of electric charges in soil (VERDADE, 1956).…”

Section: Discussionmentioning

confidence: 60%

Spatial variability of soil fertility in areas cultivated with grains in the region of Paragominas, Pará state, Brazil

Saldanha¹,

Júnior²,

Okumura³

et al. 2013

RCA

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The application of precision agriculture techniques in the management of soil fertility has optimized the use of fertilizers, enabling more sustainable agricultural systems. In this study, we aimed to assess the spatial variability of soil fertility in areas cultivated with grains in the region of Paragominas, Pará state, Brazil. The study was conducted in 17 farms in and 2010. We measured 1945 soil samples collected at the 0-0.20 m depth. The following variables were analyzed: pH, V%, m%, sum of bases, K, Ca, Mg, Al, CEC, CEC t, P, and OM. The results were evaluated by means of descriptive statistics and frequency distribution. The soils cultivated with grains presented low acidity; base saturation below 50%; medium to high values of K, Ca and Mg. The levels of available P in the soil were considered low or very low in over 40% of the soil samples analyzed, constituting the most limiting factor to production. RESUMO: A aplicação de técnicas de agricultura de precisão no manejo da fertilidade do solo tem otimizado o uso de fertilizantes e corretivos, possibilitando maior sustentabilidade aos sistemas agrícolas. O objetivo deste trabalho foi avaliar a variabilidade espacial da fertilidade do solo em áreas cultivadas com grãos na região de

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“…In clay soils, SOM is responsible for 30-40% of the cation exchange capacity (CEC) and 50-60% in of the CEC in sandy soils (Verdade, 1956). Alves et al (2001), when analyzing the humic Fonte: Adapted from Theng et al (1989).…”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Matter on the Behavior and Control Effectiveness of Herbicides in Soil

et al. 2019

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With extensive use of herbicides in agricultural areas, the risk of contamination of groundwater and surface water by these products has become a worldwide concern. Practices of application or maintenance of soil organic residues that have begun to be used in agriculture for soil nutrition have demonstrated other benefits besides nutrient supplementation, such as reduced mobility and increased soil degradation of herbicides. Because it is the final destination of herbicides, soil and its constituents, especially organic matter in tropical soils, play a prominent role in processes that encompass the dynamics of herbicide molecules. In this context, it is necessary to know the influence of the organic matter and its constituents on the behavior of the herbicides. This review discusses the main relationships of organic matter in the retention, transport, and transformation processes of herbicides in the soil, as well as the interference in the weed control effectiveness of these products. Because of this, knowing the influence of organic matter in the various processes related to the behavior of herbicides in the soil allows us to adopt more appropriate management practices regarding both weed control and remediation of contaminated areas. However, despite the wide range of information on the subject in the literature, each situation is distinct due to the wide variation in the behavioral response of the products to the different types of organic material present in the soil.

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Influência da matéria orgânica na capacidade de troca de cations do solo

Cited by 13 publications

References 7 publications

A capacidade de troca de catíons das frações orgânica e mineral em solos

A capacidade de troca de catíons das frações orgânica e mineral em solos

Spatial variability of soil fertility in areas cultivated with grains in the region of Paragominas, Pará state, Brazil

Effect of Organic Matter on the Behavior and Control Effectiveness of Herbicides in Soil

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