Alterações na mineralogia de um argissolo do Rio Grande do Sul submetido à fertilização potássica

Bortoluzzi, Édson Campanhola; Santos, Danilo Rheinheimer dos; Kaminski, João; Gatiboni, Luciano Colpo; Tessier, D.

doi:10.1590/s0100-06832005000300002

Cited by 27 publications

(42 citation statements)

References 11 publications

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“…K supply to plants is buffered by exchangeable K forms, adsorbed with low binding energy to the surface functional groups of soil reactive particles, and by non-exchangeable K forms. That was reflected in the 2011/2012 crop season, which showed decreases of 11, 29 and 18% of non-exchangeable K (Table 1) initial mean level of non-exchangeable K. It should also be noted that a decrease in non-exchangeable soil K forms may even cause changes in phases of micaceous minerals containing K, as observed by Bortoluzzi et al (2005), similar to the soil of the present study.…”

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confidence: 84%

Production and composition of oranges cv. Lane Late under maintenance potassium fertilization

et al. 2016

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This study aimed to assess the production and composition of oranges from cv. Lane Late trees submitted to maintenance potassium fertilization. The experiment was conducted in an orchard of cv. Lane Late at Rosário do Sul (RS). The orange trees were submitted to supplementation with 0, 50 or 100% of the recommended dose of foi avaliada a produção de frutos, o diâmetro de fruto, espessura da casca, volume de suco, os teores de K no suco, nas folhas e no solo. Nas safras de 2010/2011 e 2011/2012 foi avaliado o teor de vitamina C no suco, sólidos solúveis totais (SST), acidez total titulável (ATT), calculado o ratio e determinada a cor do suco e da epiderme dos frutos. A dose do fertilizante potássico, em três safras, não afeta a produção de frutos. A adição de 100% da dose aumenta o teor de K trocável no solo, o teor nas folhas e no suco, que apresenta cor mais amarelada. Palavras-chave: Análise foliar. Citrus sinensis L. Qualidade do fruto.

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confidence: 84%

Production and composition of oranges cv. Lane Late under maintenance potassium fertilization

et al. 2016

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“…This separation in classes permitted the re-establishment of the critical level of 60 mg dm -3 for most of the soils planted in RS and SC since they have CTC 7 from 5.1 to 15 cmol c dm -3 (Rheinheimer et al, 2001). However, there is evidence that it is difficult to fit soils in availability classes because in most cases they are not satisfactory indexes for estimating the soil supply capacity (Rouse & Bertramson, 1949;Mohr, 1959;Oliveira et al, 1971;Nachtigall & Vahl, 1991;Meurer & Anghinoni, 1993;Melo et al, 2004;Bortoluzzi et al, 2005;Brunetto et al, 2005;Kaminski et al, 2007). Thus, in soils rich in micaceous minerals, the K content is naturally high, while in kaolinitic soils, the content varies from high to low.…”

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confidence: 99%

Potassium availability in a hapludalf soil under long term fertilization

Kaminski

Moterle

Rheinheimer

et al. 2010

Rev. Bras. Ciênc. Solo

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In a system in which fertilization is recommended, diagnosis of soil K availability and the establishment of critical levels are made difficult by the possibility of a contribution of non-exchangeable forms of K for plant nutrition. Due to its magnitude, this contribution is well diagnosed in long term experiments and in those which compare fertilization systems with positive and negative balances in terms of replacement of the K extracted by plants. The objective of this study was to evaluate K availability in a Hapludalf under fertilization for sixteen years with the addition of K doses. The study was undertaken in an experiment set up in 1991 and carried out until 2007 in the experimental area of the Soil Department of the Federal University of Santa Maria (Universidade Federal de Santa Maria -UFSM), in Santa Maria (RS), Brazil. The soil was a Typic Hapludalf submitted to four doses of K (0, 60, 120 and 180 kg ha -1 K 2 O) and subdivided in the second year, when 60 kg ha -1 of K 2 O were reapplied in the subplots in 0, 1, 2 and 3 times. As of the fifth year, the procedure was repeated. Grain yield above ground dry matter and total K content contained in the plant tissue were evaluated. Soil samples were collected, oven dried, ground, passed through a sieve and submitted to exchangeable K analysis by the Mehlich-1 extractor; non-exchangeable K by boiling HNO 3 1 mol L -1 and total K by HF digestion. Potassium fertilization guidelines should foresee the establishment of a critical level as of which the recommended dose should accompany crop needs, which coincides with the quantity exported by the grain,

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“…The presence of smectite-illite interlayers is also evidenced by the diffractograms, in which the samples saturated with Mg 2+ showed a plane 001 reflection with great asymmetry towards larger angles (right of the peak). The observed interstratifications may be related to better drainage under current hydropedological conditions, where part of the K present between the layers of the illite is lost, becoming smectite (Bortoluzzi et al, 2005). Afterwards, as the process advances, part of the Si present in the siloxane layers is removed from the structure (desilication), resulting in the formation of the kaolinite phase of the interlayer (Bortoluzzi et al, 2007).…”

Section: Soil Properties and Pedogenetic Processesmentioning

confidence: 97%

Genesis and Classification of Sodic Soils in the Northern Pantanal

Oliveira

Chiapini

Nascimento

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:The simultaneous occurrence of high levels of exchangeable sodium percentage (ESP) and alkalinity in soils imposes restrictions on plant development and affects physical properties such as porosity, bulk density, permeability, and hydraulic conductivity. Although sodic soils are frequent in the flood plain of the São Lourenço River, northern Pantanal, Brazil, few studies focus on their formation and classification, especially with regard to specific processes and detailed classification into lower categorical levels by the different systems available. The aim of this study was to identify the predominant pedogenetic processes occurring in sodic soils of the flood plain of the São Lourenço River to understand their genesis and assess how taxonomic classification systems contemplate the variations in soil properties. Five profiles were selected in sites with different progressive stages of dissection from erosion (P1, P2, P3, P4, and P5). At each site, a pit was dug for morphological description of the profiles and for collecting samples for chemical, particle size, mineralogical, micromorphological, and chronological analyses. Each profile was classified according to the Soil Taxonomy, World Reference Base (WRB), and Brazilian Soil Classification System (SiBCS/ Sistema Brasileiro de Classificação de Solos). Argilluviation is the predominant process, with a localized and intense ferrolysis action in the E/Bt transition zones in profile P5. Soils showed signs of lithologic discontinuity. This makes it difficult to distinguish how much of the textural gradient is inherited from fluvial sedimentation processes and how much is the result of pedogenetic processes. In the most advanced stage of alteration, P5 had a paler color, thickening of the E horizon, and an abrupt and irregular transition entering the Bt horizon in the form of a "tongue". When passing from the most preserved to the most eroded area, ferrolysis becomes more intense in the E/Bt transition, the electrical conductivity values decrease, and the ESP values increase, suggesting the sodification process. Under Soil Taxonomy criteria, P5 was classified as Natraqualf and the other profiles were classified as Natrudalf; under the WRB, however, all profiles were classified as Solonetz. The SiBCS exhibited variation at the Order level, with P5 classified as Planossolo and the others as Luvissolo. Despite an indication of different processes at the Order level, the SiBCS does not yet contemplate the sodic character in the studied Luvissolos. We propose inclusion of the sodic character at the Great Group level, as has already occurred with other SiBCS classes.

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Alterações na mineralogia de um argissolo do Rio Grande do Sul submetido à fertilização potássica

Cited by 27 publications

References 11 publications

Production and composition of oranges cv. Lane Late under maintenance potassium fertilization

Production and composition of oranges cv. Lane Late under maintenance potassium fertilization

Potassium availability in a hapludalf soil under long term fertilization

Genesis and Classification of Sodic Soils in the Northern Pantanal

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