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Seasonal variation in allelopathic potential of the leaves of Copaifera langsdorffii Desf. Acta Botanica
Franco,Danilo Miralha; Saldanha,Luiz Leonardo; Neto,José de Sousa Lima; Santos,Lourdes Campaner dos; Dokkedal,Anne Ligia; Almeida,Luiz Fernando Rolim de.
ABSTRACT The deciduous plant Copaifera langsdorffii contains important medicinal compounds which may also be allelopathic and inhibitory to plant growth. The species is endemic to the Brazilian Cerrado where there is pronounced climatic seasonality. In this study we demonstrate the allelopathic capacity of extracts from the leaves of C. langsdorffii and pre-purified fractions of the extract. Analysis by HPLC-PAD-ESI-MS confirmed the presence of quercetin-3-O-α-rhamnoside and kaempferol-3-O-α-rhamnoside as major components, as well as phenolic acid derivatives of gallic acid. The extracts from samples collected during the wet season were rich in flavonoids and reduced the seed germination rate, root emergence time, and root growth of Sorghum bicolor...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fabaceae; Flavonoids; HPLC-PAD-ESI-MS; Kaempferol-3-O-α-rhamnoside; Quercetin-3-O-α-rhamnoside; Root growth.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200157
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Allelopathic effects of aqueous extracts of Artistolochia esperanzae O.Kuntze on development of Sesamum indicum L. seedlings Acta Botanica
Gatti,Ana Beatriz; Ferreira,Alfredo Gui; Arduin,Marcos; Perez,Sonia Cristina Gualtieri de Andrade.
Aristolochia esperanzae is a climbing plant that occurs in the savanna regions of Brazil. The aim of this work was to identify the effects of aqueous extracts of A. esperanzae on germination, root growth and xylem cell development of sesame seedlings. Leaf and shoot extracts were prepared at concentrations of 1.5 and 3%. Extracts caused marked changes in germination and seedling growth with greatest inhibition produced by root extracts. Morphological changes and decreased growth and development of seedlings were also observed. The extracts of A. esperanzae caused a reduction of 50% in the size of root xylem cells and marked changes in the primary root and in the number of secondary roots.
Tipo: Info:eu-repo/semantics/article Palavras-chave: "Papo-de-perú"; Allelopathy; Root growth; Xylem development; Savanna.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000200016
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Growth and root lignification of susceptible and glyphosate-resistant soybean - doi: 10.4025/actasciagron.v33i2.6305 Agronomy
Zonetti, Patricia da Costa; Cesumar; Suzuki, Letícia Sayuri; UEM; Bonini, Edicléia Aparecida; UEM; Ferrarese, Maria de Lourdes Lucio; UEM; Ferrarese Filho, Osvaldo; UEM.
Glyphosate resistance is conferred to soybean (Glycine max L. Merril) by incorporating a gene encoding a glyphosate-insensitive enzyme (CP4-EPSP synthase) that acts in the shikimate/chorismate pathway, an important metabolic route in the lignification process. The aim of this work was to investigate the root growth and lignin contents of susceptible (CD 201 and OC 14) and glyphosate-resistant (CD 214RR and CD 213RR) soybean cultivars. To this end, three-day-old seedlings were cultivated in half-strength Hoagland nutrient solution (pH 6.0) in a growth chamber (25°C, 12-h photoperiod, irradiance of 280 µmol m-2 s-1) for 24 to 96 hours. The results revealed that glyphosate-resistant (CD 213RR and CD 214RR) cultivars showed high root growth when...
Palavras-chave: 5.00.00.00-4 glyphosate-resistant soybean; Lignin; Root growth; Soybean Ciências Agrárias glyphosate-resistant soybean; Lignin; Root growth; Soybean.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6305
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Temporal dynamics of the response to Al stress in Eucalyptus grandis × Eucalyptus camaldulensis Anais da ABC (AABC)
Alcântara,Berenice K. de; Pizzaia,Daniel; Piotto,Fernando A.; Borgo,Lucélia; Brondani,Gilvano E.; Azevedo,Ricardo A..
Lipid peroxidation and root elongation of Eucalyptus grandis × Eucalyptus camaldulensis were studied under stress conditions in response to aluminum (Al), a metal known to limit agricultural productivity in acidic soils primarily due to reduced root elongation. In Brazil, the Grancam 1277 hybrid (E. grandis × E. camaldulensis) has been planted in the "Cerrado", a region of the country with a wide occurrence of acidic soils. The present study demonstrated that the hybrid exhibited root growth reduction and increased levels of lipid peroxidation after 24h of treatment with 100 µM of Al, which was followed by a reduction in lipid peroxidation levels and the recovery of root elongation after 48h of Al exposure, suggesting a rapid response to the early...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aluminum; Eucalypt; Lipid peroxidation; Oxidative stress; Root growth.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201063
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Investigation on the effects of guava (Psidium guajava L.) infusions on germination, root tips and meristematic cells of Latuca sativa Anais da ABC (AABC)
Luber,Jaquelini; Palmieri,Marcel J.; Botelho,Carolina M.; Rinaldo,Daniel; Andrade-Vieira,Larissa F..
Guava (Psidium guajava L.) is a plant often employed in popular medicine. Recently several studies have alerted about the toxicity of substances present in medicinal plants, which can pose risks to the human health. In this sense, the present work aimed to investigate the phytotoxic, cytotoxic and genotoxic action of three guava varieties - Paluma, Pedro Sato and Roxa ("purple") - on the plant test system Lactuca sativa L. Thus, macro- and microscopic evaluations were carried out for five infusion concentrations (2.5, 5.0, 10.0, 20.0 and 40.0 g.L-1) prepared from each variety. Distilled water was used as negative control. Chromatographic and spectroscopic analysis by HPLC-PAD indicated that the chemical composition of the infusion of Roxa is different than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citogenetoxicity; Root growth; Mitotic index; Seed germination; IC50.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200903
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Effects of substrate water potential in root growth of Agave salmiana Otto ex Salm-Dyck seedlings Biol. Res.
PEÑA-VALDIVIA,CECILIA B; SÁNCHEZ-URDANETA,ADRIANA B.
The objective of this study was to test the hypothesis that root of maguey (Agave salmiana Otto ex Salm-Dyck) seedlings reacts during the first 24 h to low substrate water potential (Yw), by anatomical modifications. Three-4 cm root length seedlings were planted in vermiculite for 24 h at Yw between -0.03 and -2.35 MPa. Root dimensions, proline content and anatomy were evaluated. Substrate ψw between -0.65 and -2.35 MPa did not significantly affect longitudinal root growth. However, proline content significantly increased from 1.6 to 2.1 emoles mg-1. Significant reductions of transverse root area (41 %), thickness of mucilage covering the epidermis (47 %), thickness of epidermis (between 15 and 46 %), area of the parenchyma (between 35 and 41 %)...
Tipo: Journal article Palavras-chave: Maguey; Proline; Root anatomy; Root growth; Water deficit; Water stress.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200013
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Effects of aluminum on the elongation and external morphology of root tips in two maize genotypes Bragantia
Souza,Leandro Torres de; Cambraia,José; Ribeiro,Cleberson; Oliveira,Juraci Alves de; Silva,Luzimar Campos da.
ABSTRACT The objective of this study was to evaluate the effects of toxic levels of aluminum (Al) on the growth and external morphology of root tips in two maize genotypes with differential Al tolerance. The maize genotypes UFVM-100 (Al-sensitive) and UFVM-200 (Al-tolerant) were treated with 0 and 50 mM Al in a 0.5 mM CaCl2 solution at pH 4.5; root elongation, Al content and the external morphology of the root tips were evaluated. Chemical analysis, hematoxylin staining and energy dispersive X-ray spectrometry (EDS) showed greater Al accumulation in the root tips of the UFVM-200 genotype. The inhibition of root elongation in the UFVM-100 genotype, however, was much stronger than in the UFVM-200 genotype. Both maize genotypes exhibited visible and intense...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aluminum tolerance; Root growth; Root morphology; Zea mays.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100019
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Naringenin inhibits the growth and stimulates the lignification of soybean root BABT
Bido,Graciene de Souza; Ferrarese,Maria de Lourdes Lucio; Marchiosi,Rogério; Ferrarese-Filho,Osvaldo.
The flavanone naringenin, an intermediate in flavonoid biosynthesis, was tested for its effect on root growth, phenylalanine ammonia-lyase (PAL) and peroxidase (POD) activities, as well as phenolic compounds and lignin contents in soybean (Glycine max L. Merrill) seedlings. Three-day-old seedlings were cultivated in half-strength Hoagland nutrient solution (pH 6.0), with or without 0.1 to 0.4 mM naringenin in a growth chamber (25°C, 12-h photoperiod, irradiance of 280 µmol m-2 s-1) for 24 h. Inhibitory effects on root growth (length, weight, cell viability), PAL and soluble POD activities were detected after naringenin treatments. These effects were associated with stimulatory activity of the cell wall-bound POD followed by an increase in the lignin...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allelopathy; Lignin; Flavonoid; Peroxidase; Phenylalanine ammonia-lyase; Root growth.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000300005
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Tolerance to aluminum toxicity by tropical leguminous plants used as cover crops BABT
Meda,Anderson Rotter; Furlani,Pedro Roberto.
The objectives of this work were to compare Al tolerance among 17 species of tropical leguminous plants and to evaluate the most appropriate plant characteristic and Al concentration in nutrient solution for tolerance assessment. In addition, three soybean cultivars were included for comparison purposes. There was a great difference among the 17 plant materials tested, when compared by relative root elongation and critical Al activity to reduce 50% of root net elongation. Based on these parameters and on the comparison of two tropical maize genotypes differing in Al tolerance, the following classification was established: highly tolerant, for Mucuna nivea, M. deeringiana, M. aterrima Vigna unguiculata cv. BR 17 and Lablab purpureus cv. Rongai; tolerant for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nutrient solution culture; Root growth; Dry matter yields; Al speciation.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000200019
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The interactive effect of phosphorus and nitrogen on "in vitro" spore germination of Glomus etunicatum Becker & Gerdemann, root growth and mycorrhizal colonization BJM
Bressan,Wellington.
The effects of P and N amendment and its interactions on spore germination, root growth and colonized root length by Glomus etunicatum Becker & Gerdemann (INVAM S329) was studied "in vitro" in RiT - DNA transformed roots of Anthylis vulneraria sub sp. Sampaiana (Kidney vetch). Three N media concentrations (5, 10 and 50 mg/l) at P constant level (2 mg/l) and three P media concentrations (2, 10 and 20 mg/l) at N constant level (5 mg/l) were utilized as a treatment. Bécard & Fortin medium was used as a basal medium for root growth and colonized root length, and water/agar (0.8%) media was the control for spore germination. Spore germination of G. etunicatum at low P level was reduced by N addition in relation to the control media, and at low N...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mycorrhiza; Glomus etunicatum; Spore germination; Root growth; Root colonization.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000400004
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Change in root apical protein and peroxidase activity in response to aluminum in tolerant and sensitive maize inbred lines Braz. J. Plant Physiol.
Souza,Isabel Regina Prazeres de; Alves,Vera Maria Carvalho; Parentoni,Sidney Netto; Oliveira,Antônio Carlos de; Teixeira,Flávia França; MacAdam,Jennifer Wilson; Purcino,Antônio Álvaro Corsetii.
The effects of a short-term (80 min) exposure to 222 µM aluminum (Al) on the protein content and expression and on peroxidase activity and isoenzymes in the primary root of maize were evaluated. Two inbred lines differing in their level of tolerance to Al were used: Cateto 237 (tolerant) and L36 (sensitive). The apical 20 mm of the primary root was divided into 2-mm-long segments that were analyzed for total protein content and peroxidase activity. These results demonstrate that the total protein content along the root apex was not affected by Al in the tolerant inbred line, but decreased in the sensitive line. In the apical 2 mm of the root of the sensitive line, the expression of low molecular weight proteins (43 kDa or smaller) was decreased. Expression...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aluminum toxicity; Maize; Peroxidase isoforms; Root growth.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000300006
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Ecophysiology of the cacao tree Braz. J. Plant Physiol.
Almeida,Alex-Alan F. de; Valle,Raúl R..
Cacao, one of the world's most important perennial crops, is almost exclusively explored for chocolate manufacturing. Most cacao varieties belong to three groups: Criollo, Forastero and Trinitario that vary according to morphology, genetic and geographical origins. It is cropped under the shade of forest trees or as a monocrop without shade. Seedlings initially show an orthotropic growth with leaf emission relatively independent of climate. The maturity phase begins with the emission of plagiotropic branches that form the tree crown. At this stage environmental factors exert a large influence on plant development. Growth and development of cacao are highly dependent on temperature, which mainly affects vegetative growth, flowering and fruit development....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Root growth; Flowering; Pod set; Flushing; Mineral nutrition.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400011
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Seasonal pattern of root growth in relation to shoot phenology and soil temperature in sweet cherry trees (Prunus avium): A preliminary study in central Chile Ciencia e Investigación Agraria
Bonomelli,Claudia; Bonilla,Carlos; Acuña,Edouard; Artacho,Pamela.
The period between flowering and harvest in the sweet cherry (Prunus avium L.) is shorter than most fruit trees; thus, competition for assimilate and nutrients occurs early in the season. To properly supply water and nutrients during this critical period, optimal growth and root development are necessary. To characterize the root growth pattern of cherry trees in relation to shoot growth and phenology, a study was conducted on a 'Bing' cherry orchard on Gisela 6 rootstock at fourth leaf, located in central Chile (34°70' S, 70°43' W). During the 2009-2010 season, the shoot length and fruit diameter were measured on eight trees, and the root length was quantified by installing rhizotrons on two trees. Additionally, a two-tone (black/white) plastic cover was...
Tipo: Journal article Palavras-chave: Accumulated degree days; Root growth; Root length; Soil temperature; Sweet cherry.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100010
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Crecimiento y estructura de la raíz en plantas de Pinus pinceana sometidas a dos condiciones de humedad del suelo. Colegio de Postgraduados
Córdoba Rodríguez, Diana.
Pinus pinceana Gordon es un pino piñonero endémico que crece en poblaciones aisladas en condiciones semiáridas, en el noreste y centro-oriente de México. Con el propósito de identificar características de la raíz asociadas a mecanismos de adaptación ante condiciones de estrés hídrico, se evaluó el crecimiento y estructura de la raíz en plantas de seis poblaciones de la especie en dos condiciones de humedad del suelo. El estudio se realizó en plantas de tres años de edad y recién germinadas manteniendo la humedad del suelo cercana a capacidad de campo (S0) o por debajo de 20 % de humedad aprovechable (S1). Se determinó que en las plantas de tres años de edad, el estrés hídrico redujo en 27 % el número de raíces principales, en 51 % la biomasa de la raíz...
Palavras-chave: Pinus pinceana; Crecimiento de raíz; Distribución de biomasa; Estrés hídrico; Relación parte aérea/raíz; Sequía; Biomass allocation; Drought; Root growth; Shoot/root ratio; Water stress; Maestría; Forestal.
Ano: 2010 URL: http://hdl.handle.net/10521/225
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Crecimiento y estructura de la raíz en plantas de Pinus pinceana sometidas a dos condiciones de humedad del suelo. Colegio de Postgraduados
Córdoba Rodríguez, Diana.
Pinus pinceana Gordon es un pino piñonero endémico que crece en poblaciones aisladas en condiciones semiáridas, en el noreste y centro-oriente de México. Con el propósito de identificar características de la raíz asociadas a mecanismos de adaptación ante condiciones de estrés hídrico, se evaluó el crecimiento y estructura de la raíz en plantas de seis poblaciones de la especie en dos condiciones de humedad del suelo. El estudio se realizó en plantas de tres años de edad y recién germinadas manteniendo la humedad del suelo cercana a capacidad de campo (S0) o por debajo de 20 % de humedad aprovechable (S1). Se determinó que en las plantas de tres años de edad, el estrés hídrico redujo en 27 % el número de raíces principales, en 51 % la biomasa de la raíz...
Palavras-chave: Pinus pinceana; Crecimiento de raíz; Distribución de biomasa; Estrés hídrico; Relación parte aérea/raíz; Sequía; Biomass allocation; Drought; Root growth; Shoot/root ratio; Water stress; Maestría; Forestal.
Ano: 2010 URL: http://hdl.handle.net/10521/225
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YUCCA4 overexpression modulates auxin biosynthesis and transport and influences plant growth and development via crosstalk with abscisic acid in Arabidopsis thaliana Genet. Mol. Biol.
Munguía-Rodríguez,Aarón Giovanni; López-Bucio,Jesús Salvador; Ruiz-Herrera,León Francisco; Ortiz-Castro,Randy; Guevara-García,Ángel Arturo; Marsch-Martínez,Nayelli; Carreón-Abud,Yazmín; López-Bucio,José; Martínez-Trujillo,Miguel.
Abstract Auxin regulates a plethora of events during plant growth and development, acting in concert with other phytohormones. YUCCA genes encode flavin monooxygenases that function in tryptophan-dependent auxin biosynthesis. To understand the contribution of the YUCCA4 (YUC4) gene on auxin homeostasis, plant growth and interaction with abscisic acid (ABA) signaling, 35S::YUC4 seedlings were generated, which showed elongated hypocotyls with hyponastic leaves and changes in root system architecture that correlate with enhanced auxin responsive gene expression. Differential expression of PIN1, 2, 3 and 7 auxin transporters was detected in roots of YUC4 overexpressing seedlings compared to the wild-type: PIN1 was down-regulated whereas PIN2, PIN3 and PIN7...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arabidopsis; Auxin; Abscisic acid; YUCCA4; Root growth; Germination.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000100302
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O segredo está nas raízes. Infoteca-e
SALIS, S. M. de; LEHN, C. R.; MATTOS, P. P. de; BERGIER, I.; CRISPIM, S. M. A..
Por cima da terra, seja no Cerrado ou no Pantanal, várias árvores da mesma espécie são bem semelhantes debaixo do solo.
Tipo: Artigo na mídia Palavras-chave: Árvores; Raiz; Anatomia vegetal; Espécie; Tamanho; Root growth; Trees.
Ano: 2016 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1047364
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Corn crop performance in an Ultisol compacted by tractor traffic PAB
Moraes,Moacir Tuzzin de; Levien,Renato; Trein,Carlos Ricardo; Bonetti,João de Andrade; Debiasi,Henrique.
Abstract: The objective of this work was to determine whether compaction by tractor traffic in areas managed under controlled traffic can be limiting to corn crop, under different tillage systems, in a Typic Paleudult of medium texture. Two experiments were carried out, one in the field over two crop seasons and another in a greenhouse. The treatments consisted of minimum tillage with chiselling; no-tillage subjected to one, three, or six passes of a tractor weighing 3.8 Mg; and an area without traffic. Evaluations were performed for soil physico-hydraulic parameters (soil bulk density, penetration resistance, and water retention curve), root and shoot growth, and grain yield. The agricultural traffic increased bulk density, soil penetration resistance,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Grain yield; No-tillage; Root growth; Soil compaction.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400464
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Root abundance of maize in conventionally-tilled and zero-tilled soils of Argentina Rev. Bras. Ciênc. Solo
Taboada,Miguel Angel; Alvarez,Carina Rosa.
Maize root growth is negatively affected by compacted layers in the surface (e.g. agricultural traffic) and subsoil layers (e.g. claypans). Both kinds of soil mechanical impedances often coexist in maize fields, but the combined effects on root growth have seldom been studied. Soil physical properties and maize root abundance were determined in three different soils of the Rolling Pampa of Argentina, in conventionally-tilled (CT) and zero-tilled (ZT) fields cultivated with maize. In the soil with a light Bt horizon (loamy Typic Argiudoll, Chivilcoy site), induced plough pans were detected in CT plots at a depth of 0-0.12 m through significant increases in bulk density (1.15 to 1.27 Mg m-3) and cone (tip angle of 60 º) penetrometer resistance (7.18 to 9.37...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zero tillage; Conventional tillage; Soil compaction; Root growth.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200031
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Lime and gypsum to improve root depth of orange crop in an Ultisol of the Coastal Tablelands AGRIAMBI
Sobral,Lafayette F.; Cintra,Fernando L. D.; Smyth,Jot T..
Coastal Tableland is a landscape unit in the North East of Brazil in which the main soils are Ultisols. In these soils, a compacted layer denominated "cohesive horizon" occurs and root growth is limited by it. An experiment with five treatments and six replications was set up in order to study how liming and gypsum could improve root depth of orange (Citrus sinensis L. Osbeck) crop in an Ultisol in which a compacted layer was found at 0.3 m. Treatments were: A - No liming and no gypsum; B - Liming to achieve 60% base saturation; C - B + 1 t of gypsum ha-1 ; D - B + 2 t of gypsum ha-1 and E - B + 3 t of gypsum ha-1. Gypsum increased calcium and sulfate in the cohesive horizon. Surface application of lime and gypsum did not cause changes in soil density and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compacted layer; Cohesive horizon; Root growth.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662009000700004
Registros recuperados: 26
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