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Registros recuperados: 15
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Cap-hardening parameters of Cam-clay model variations with soil moisture content and shape-restricted regression model CIGR Journal
Mehari Zewde Tekeste; Deere&Co; Desale H Habtzghi; Department of Statistics, The University of Akron, Akron, OH; Jos Koolen; Wagenigen University.
Modeling of soil elastic and permanent plastic volumetric strains (compaction) caused by loading from machinery vehicles using the modified Cam-clay soil constitutive model requires understanding the behaviors of compression and rebound parameters under unsaturated soil conditions.  Oedometer tests were conducted on a sandy loam, a loam, and a clay loam soil, all tropical soils, at three initial soil moisture contents and five maximum stress levels (50, 100, 200, 300 and 400 kPa).  The objectives were to investigate the effects of soil moisture content and maximum applied stress on the modified compression index (l*) and modified rebound index (k*) parameters of a modified Cam-clay soil model on the three soils and predict the compressibility indices using...
Palavras-chave: Modified compression index (l*); Modified rebound index (k*); Axial stress; Uniaxial compression cyclic test; Soil moisture; Soil types.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2214
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Comparison of Paenibacillus azotofixans strains isolated from rhizoplane, rhizosphere, and non-root-associated soil from maize planted in two different Brazilian soils. Repositório Alice
SELDIN, L.; ROSADO, A. S.; CRUZ, D. W. da; NOBREGA, A.; ELSAS, J. D. van; PAIVA, E..
Paenibacillus azotofixans is a nitrogen-fixing bacterium often found in soil and in the rhizospheres of different grasses. In this study, two Brazilian clay soils were planted with cross-hybrid maize (BR-201) and four stages of plant growth were analysed to characterize the P. azotofixans populations present in the rhizoplanes, rhizospheres, and non-root-associated soils (herein called nonrhizospheres). A total of 106 strains were isolated and identified as P. azotofixans with an API 50CH kit, by classical biochemical tests, and via the use of specific primers based on the 16S rRNA gene in PCRs. To compare the isolated strains, phenotypic characteristics were determined and three different probes were used in hybridization experiments: two nif probes and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Maize; Soil types; Cerrado soils; Clay soils; Rhizosphere.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/489147
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Fertilizer trial on corn and sorghum Thai Agricultural
Ring Meesawat; Dumri Thawornmas; Tianchai Suvanvej; Pradit Boonampol; Mongkol Panichkul.
7 tables
Palavras-chave: Corn; Maize; Sorghum; Fertilizer trials; Nitrogen fertilizers; Rock phosphate; Livestock manures; Soil chemicophysical properties; Nitrogen uptake; Soil types; Growth; Yields; ข้าวโพด; ข้าวฟ่าง; การทดสอบปุ๋ย.
Ano: 1977 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3926
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Fuel consumption of some tractor models for ploughing operations in the sandy-loam soil of Nigeria at various speeds and ploughing depths CIGR Journal
Adewoyin, Adewale Olaniyi; Ajav, Emmanuel Atoo.
Tractors acquired in Oyo State-Nigeria are primarily utilized for ploughing operations which represents the most costly single item in the budget of an arable farmer.  Tractor fuel consumption constitutes a significant parameter that affects tractors performances for ploughing operations.  The effect of ploughing speed and depth on tractors fuel consumption was therefore examined in a bid to establish their optimum operating conditions.  The soil characteristics of the study site were determined using laboratory tests.  Ploughing operations, using ASABE standard D497.5, were carried out on 100×500 m research farmland using Massey Ferguson (MF 435, 100 hp), Fiat (F130D, 100 hp) and Steyr(CVT170, 100 hp) tractors that were purchased in 2009.  Field...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural Engineering; Farm Power and Machinery Tractor performance; Soil types; Ploughing depth; Ploughing speed; Fuel consumption.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2466
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Integrated research program on soil and fertilizer, requirement for increasing yields of corn and sorghum Thai Agricultural
Amnat Suwanarit; Aschan Sukthumrong; Jongruk Chanchareonsook; Kanchana Laosrichareonsakul; Sakkasem Soonthornphat; Nuntarat Supakamnerd; Lawal Powpaichit; Sorasith Vacharotayan.
2 ill., 23 tables
Palavras-chave: Corn; Maize; Sorghum; Fertilizers; Nitrogen fertilizers; Phosphate fertilizers; Rock phosphate; Mixed fertilizers; Intercropping; Cropping systems; Soil types; Nutrient uptake; Growth; Yields; ข้าวโพด; ข้าวฟ่าง; การทดสอบปุ๋ย; ความอุดมสมบูรณ์ของดิน; การเพาะปลูก; การจัดการดิน.
Ano: 1977 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3927
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Levantamento de reconhecimento de alta intensidade dos solos da folha Marapanim, Estado do Pará. Infoteca-e
OLIVEIRA JÚNIOR, R. C. de; SILVA, J. M. L. da; CAPECHE, C. L.; RODRIGUES, T. E..
Caracterização da área. Localização. Vegetação. Geologia. Relevo. Hidrografia. Clima. Metodologia. Solos. Critérios e características diferenciais para caracterização e classificação dos solos. Descrição das classes de solos. Latossolo Amarelo. Podzólico amarelo. Solonchak Sodico Salino. Glei Pouco Humico. Areias Quartzosas Podzólicas. Podzol Hidromorfico. Solo aluvial.
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Reconhecimento do solo; Propriedade físico-química do solo; Tipo de solo; Marapanim; Pará; Amazônia; Brasil; Soil surveys; Soil types; Soil chemicophysical properties.
Ano: 1997 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/386504
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Os solos da Amazônia Oriental. Infoteca-e
SILVA, B. N. R. da; CARVALHO, J. dos S..
1986
Tipo: Outras publicações técnicas (INFOTECA-E) Palavras-chave: Tipo fisiográfico do solo; Fisiografia; Característica morfológica do solo; Amazônia; Brasil; Physiographic; Soil types; Physiography; Soil morphological features.
Ano: 1986 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/394722
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Quantitative analysis of growth in coffee plants cultivated with a water-retaining polymer in an irrigated system1 Rev. Ciênc. Agron.
Souza,Antonio Jackson de Jesus; Guimarães,Rubens José; Colombo,Alberto; Sant’Ana,José Antonio do Vale; Castanheira,Dalyse Toledo.
ABSTRACT This study aimed to evaluate the use of hydro polymer retainer in the quantitative growth of coffee plants at different levels of irrigation and soil types. The experiment was conducted in pots with seedlings bag in the greenhouse of the Setor de Cafeicultura, Universidade Federal de Lavras. The experimental design was in randomized blocks in factorial (2x4x2): absence or presence of hydro polymer retainer, four levels of irrigation (25%, 50%, 75% and 100%), two soil types (sandy soil and medium texture). At 150 days evaluated the stem diameter, plant height, leaf area, number of leaves, dry weight of shoots, plant dry mass, root dry weight, root dry weight ratio of shoot, leaf area ratio, absolute growth rate, relative growth rate, net...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil types; Greenhouse; Coffea arabica L.; Hydrogel.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100162
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Relação solo, geologia, paisagem em ambientes da Zona da Mata Norte do Estado de Alagoas. Repositório Alice
OLIVEIRA NETO, M. B. de; CUNHA, T. J. F.; SILVA, M. S. L. da; MARQUES, F. A.; AMARAL, A. J. do.
Durante o mapeamento de solos do estado de Alagoas foram identificados alguns solos com características físicas pouco comuns para a região com clima tropical úmido. A região estudada apresenta uma variabilidade ambiental bastante significativa, por abranger extratos geológicos e relevos diversificados. Com base nas observações de campo, verificamos que a diferenciação dos solos na paisagem poderia estar diretamente relacionada com a variabilidade geoambiental da região. A caracterização dos solos, a sua disposição na paisagem e a relação com a geologia são de fundamental importância para o desenvolvimento da agropecuária com responsabilidade ambiental. Com base neste contexto, o presente trabalho teve como objetivo principal a caracterização de três perfis...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Mapeamento de solo; Degradação ambiental; Alítico; Levantamento de solo; Dissecamento; Geoambiente; Topossequência; Código florestal; Alagoas; Solo; Geomorfologia; Soil; Soil types.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/903349
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Rootstock-scion interaction: 2.effect on the composition of cabernet sauvignon grape must. Repositório Alice
MIELE, A.; RIZZON, L. A..
ABSTRACT - The interaction between rootstock, scion and the environment may induce different responses to the grapevine physiology and, consequently, to the grape composition. The vineyards of Serra Gaúcha, Brazil, are established in different soil types, each with different morphological and physicochemical attributes. Moreover, the grapevines are grafted onto a diversity of rootstocks. Therefore, this study aimed to determine the effect of 15 rootstocks in the composition of the Cabernet Sauvignon (CS) grape must. The following rootstocks were used: Rupestris du Lot, 101-14 Mgt., 3309 C, 420A Mgt., 5BB K, 161-49 C, SO4, Solferino, 1103 P, 99 R, 110 R, Gravesac, Fercal, Dogridge and Isabel, featuring some genetic diversity altogether. The experimental...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Grapevine; Grafting; Composition; Grape; Scion; Grapevine physiology; Vineyards; Serra Gaúcha; Soil types; Vitis vinifera; Minerals; Rootstock; Cabernet sauvignon.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1074156
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Soil studies Thai Agricultural
4 ill., 14 tables
Palavras-chave: Corn; Maize; Sorghum; Varieties; Nitrogen fertilizers; Phosphate fertilizers; Soil physics; Soil moisture regime; Soil chemicophysical properties; Soil mineralogy; Soil types; Soil surveys; Growth; Yields; ข้าวโพด; ข้าวฟ่าง; ความอุดมสมบูรณ์ของดิน; ลักษณะทางกายภาพ; การสำรวจดิน; ชุดดิน.
Ano: 1971 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3762
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Temporal stability of soil moisture in an experimental watershed in the Pernambuco semi-arid region AGRIAMBI
Silva Junior,Valdemir P.; Montenegro,Abelardo A. A.; Melo,Rogério O. de.
ABSTRACT Soil moisture estimation is very important in decision making regarding agricultural practices and investigations in hydrology. The aim of the study was to evaluate surface soil moisture temporal stability under two cover crop conditions in an experimental watershed in the Brazilian semi-arid region, aiming to identify stable points, thus reducing monitoring costs and highlighting the importance of temporal stability in a watershed. Fourty five soil moisture monitoring campaigns in the layers of 0-0.10 and 0.10-0.20 m were conducted using a capacitance probe (Diviner – 2000®) during the period from 10/07/2010 to 03/25/2014, with soil cover under native bushy vegetation and degraded pasture, predominantly Brachiaria decumbens. Temporal stability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil types; Soil cover; Caatinga.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000880
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The Mediterranean soils: a quick overview IPB - Escola Superior Agrária
Figueiredo, Tomás de.
A quick overview on Mediterranean soils (types, characteristics, formation factors and processes), oriented to post-graduation students on the topic of soil protection in Mediterranean environments
Tipo: BookPart Palavras-chave: Mediterranean; Soil types; Soil formation factors; Soil threats.
Ano: 2009 URL: http://hdl.handle.net/10198/5268
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Uso de fosfatos naturais em pastagens. Infoteca-e
SANZONOWICZ, C.; GOEDERT, W.J..
A eficiencia de uma fonte de fosforo esta relacionada as suas caracteristicas, mas tambem depende do tipo de solo e do comportamento da especie vegetal. Os fosfatos naturais brasileiros so de baixa solubilidade e de dissolucao lenta. A eficiencia agronomica inicial e baixa, aumentando com o passar do tempo. A decisao sobre a viabilidade do uso dos fosfatos naturais brasileiros para pastagens nao pode ser generalizada; contudo, os resultados experimentais mostram que a utilizacao dessas fontes torna-se viavel desde que a estrategia de manejo seja adequada. Nesse aspecto, merecem destaque a escolha da especie forrageira, da dose e do modo de aplicacao do fosfato, do tipo de solo e da relacao de precos da unidade de fosforo total na forma de fosfato natural...
Tipo: Circular Técnica (INFOTECA-E) Palavras-chave: Pastagem; Adubacao; Fertilizante fosfatado; Brachiaria decumbens; Brachiaria humidicola; Andropogon gayanus; Cerrado; Pastures; Phosphate fertilizers; Fertilizer application; Fosfato natural; Nível; Pastagem; Rates; Soil types; Solo; Tipo; Uso.
Ano: 1986 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/547690
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การคาดคะเนผลผลิต รายได้และอัตราปุ๋ยไนโตรเจนที่เหมาะสมในการปลูกข้าวโพดพันธุ์ลูกผสมบนชุดดินต่าง ๆ ในพื้นที่ 4 จังหวัด Thai Agricultural
Tasnee Attananthana; Chairerk Suwannarat; Taweesak Vearsile; Sahaschai Kongton; Ring Meesawat; Pradit Boonampol; Kukiat Soitong; Arunee Charoensaksiri.
4 tables
Palavras-chave: Corn; Maize; Yields; Revenue; Optimun N rate; Single cross hybrid; Soil types; ข้าวโพด; ข้าวโพดลูกผสม; ผลผลิต; รายได้; อัตราปุ๋ยไนโตรเจน.
Ano: 2003 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4559
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