Enxofre elementar no manejo do pH de substrato orgânico alcalino

Boaro, Vinicius; Schwarz, Sérgio Francisco; Souza, Paulo Vítor Dutra de; Soares, Wagner; Lourosa, Gil Vicente

doi:10.1590/0103-8478cr20130768

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…O manejo do pH elevado é mais difícil e oneroso, visto que emprega a utilização de adubos de base ácida ou a aplicação de acidificantes, como por exemplo enxofre elementar. Boaro et al (2014), trabalhando com substrato alcalino (pH original próximo de 8), utilizou doses de até 16 g L -1 de enxofre elementar, conseguindo diminuir para índices aceitáveis, entretanto aumentando em demasia a condutividade elétrica (CE). Contudo, a proporção de enxofre a ser utilizado parece estar diretamente relacionada à composição do substrato, pois Kämpf et al (2009) alcançou resultados satisfatórios reduzindo o pH de fibra de coco + argila expandida (1:2, volume) com apenas 0,5 g de enxofre por litro de substrato, sem prejuízos sobre a elevação a condutividade elétrica.…”

Section: Resultsunclassified

Um panorama das propriedades físicas e químicas de substratos utilizados em horticultura no sul do Brasil

Schäfer

Souza²,

Fior³

2015

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The cultivation in greenhouse and containers culminated with the necessity to use substrates with formulations as well as distinguished chemical and physical characteristics, the last ones assuming a key role in cultivation of horticultural plants. The aim of this study is to present results of physical and chemical analyses of substrates forwarded to an commercial laboratory (Laboratório de Substratos para Plantas - UFRGS) for the last three years, aiming to establishing a panorama of the substrates area and comparing them with reference values cited in the literature. In this period were performed 307 physical and 479 chemical analyses, which were the basis for this study. Physical analyses performed were the density in dry basis and the water retention curve (total porosity, air space, available water and remaining water). Chemical analyses were the electrical conductivity (EC) and the pH. The main results concerning physical characteristics, demonstrate that the substrates present wide range of density in dry basis and may be used for different sized containers; however most substrates analyzed is out of ideal range for the other physical characteristics of the substrate. For the chemical characteristic the substrates in cultivation in southern Brazil are mostly alkaline and the electrical conductivity of the substrates in cultivation is very diverse, with considerable number of samples above the recommended.

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Section: Resultsunclassified

Um panorama das propriedades físicas e químicas de substratos utilizados em horticultura no sul do Brasil

Schäfer

Souza²,

Fior³

2015

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“…It is also noteworthy here that the changes in the substrates pH can occur even without cultivated plants on it, but only with the water addition to the medium. Boaro et al (2014) found a pH change in cubic order, when eucalyptus bark substrate was watered for over 80 days. Under these circumstances, it is important to monitor the substrates pH during the cultivation period, because the pH is resulted of the relationship between substrate, water and plant.…”

Section: Experiments IImentioning

confidence: 94%

“…It is likely that the applied dosage of nutrient was not suitable for desert rose, so that plants also absorbed ions present in the substrates and led the EC values below 0.3 mS cm -1 for all the substrates. During the period of seedling cultivation, pH of pine bark substrate and its mixtures were near to 8.0 ( Figure 3), which according to Boaro et al (2014) is common in many organic substrates. They reported the pH and electrical conductivity presenting values of 7.8 and 0.98 mS cm -1 respectively, for the composted substrate of eucalyptus bark.…”

Section: Experiments IImentioning

confidence: 96%

Production of desert rose seedlings in different potting media

Colombo¹,

Favetta²,

Carvalho³

et al. 2017

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Over the past decade the desert rose received fame in the flower market due to its striking and sculptural forms; however, the commercial production of these species is quite recent and little is known about its crop management, including substrates recommendation. The objectives of this study were to investigate the effect of different substrates on desert rose seed germination and production of its seedlings. Experiment I: freshly harvested seeds of desert rose were sown in different substrates e.g. sand, coconut fiber, semi-composted pine bark, sand + coconut fiber, semi-composted pine bark + sand and coconut fiber + semicomposted pine bark. These substrates were evaluated to study the emergence percentage of seeds, initial growth of seedlings and seedling emergence speed index (ESI). Experiment II: desert rose from the experiment I were transferred to plastic pots filled with the same substrates as in experiment I. The pH and electrical conductivity (EC) of the substrates were noted every 30 days while the growth parameters of seedlings were recorded after 240 days. Results from experiment I showed higher germination rate and seedling growth in substrates containing semi-composted pine bark. Similarly, in experiment II, better quality seedlings were observed in substrates containing semi-composted pine bark. Thus, for desert rose seed germination and seedling growth, it is recommended to use substrates containing semi-composted pine bark.

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“…In this context, the non-removal of bases, since it is an incubation study in a system without free drainage, might have contributed to a low pH reduction and base saturation of the soils. A secondary effect observed by the application of S 0 is the increase of electrical conductivity (Boaro et al, 2014). This increase is the result of the release of exchangeable cations into the soil solution, due to the increase of H + ions in the exchange complex.…”

Section: Resultsmentioning

confidence: 99%

Elemental sulfur recommendation for pH reduction in soils from Southern Brazil

Dall’Orsoletta

Mumbach

Brignoli

et al. 2022

Rev. bras. eng. agríc. ambient.

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The elemental sulfur (S0) application may reduce soil pH, benefiting plants adapted to acid conditions and lessening problems of overliming. Nevertheless, there is no official recommendation for its application. The objective of the study was to quantify the S0 doses required to reduce the pH of soils from Southern Brazil. The experiment was carried out in the laboratory in a factorial scheme (5 × 5), with a completely randomized design and three replicates. The treatments consisted of five soils, and five doses of S0, corresponding to 0, 50, 100, 150, and 200% of the estimated dose need to reach pH 4.0. The applied doses of S0 resulted in reduction of pH and base saturation (V%) and increase of potential acidity (H + Al). These effects, however, were reduced due to the low rate of oxidation of the S0 applied (0.76-3.36%). The soil variables correlated with S0 oxidation were Mg2+ (0.86***), Al3+ (-0.82***), H + Al (-0.89***), V% (0.68***) and aluminum saturation (m%) (-0.87***). In the evaluated soils the oxidation of 50 kg ha-1 of S0 was required to reduce one unit of pH in H2O.

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Enxofre elementar no manejo do pH de substrato orgânico alcalino

Abstract: RESUMO Embora existam recomendações agronômicas consolidadas para a elevação do pH de substratos orgânicos, poucas são as informações disponíveis para a redução. Porém, a crescente utilização de matérias-primas alternativas às tradicionais torna

Cited by 10 publications

References 6 publications

Um panorama das propriedades físicas e químicas de substratos utilizados em horticultura no sul do Brasil

Um panorama das propriedades físicas e químicas de substratos utilizados em horticultura no sul do Brasil

Production of desert rose seedlings in different potting media

Elemental sulfur recommendation for pH reduction in soils from Southern Brazil

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