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| Registros recuperados: 33 | |
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| Silva,Gilmara Pereira da; Prado,Renato de Mello; Almeida,Thiago Batista Firmato; Nóia,N. Regina de Campos. |
| Maximum efficiency of nitrogen (N) is attained when fertilizer is accompanied by silicon (Si). Therefore, the objective of this study was to evaluate the chemical attributes of the soil, the nutritional status, the yield of stalks, and the accumulation of N and Si by a fourth ratoon sugarcane (Saccharum sp.) crop, and the influence of N doses in the presence and absence of Si and lime. The study was carried out at the experimental farm of the UNESP Jaboticabal campus, state of São Paulo, Brazil. The experimental design was in a completely randomized block with a 5x2 factorial scheme: five doses of N (0, 40, 80, 120, and 160 kg ha-1), and two corrective materials, silicate and lime; with four replications per treatment. The soil was characterized as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Nitrogen fertilization; Silicate; Limestone; Stalk production. |
| Ano: 2015 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000500005 |
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| BARRA,BRENO; MOMM,LETO; GUERRERO,YADER; BERNUCCI,LIEDI. |
| This paper discusses the importance of studies on materials known as fillers from different mineral origins, used in asphalt mixes, specifically in the formulation of mastics. The research was carried out on samples of limestone and granite rock filler and asphalt binder (50/70). The samples were evaluated through semiquantitative chemical analyses by X-ray fluorescence, granulometry by low angle laser emission, scanning electron microscopy, softening point tests, penetration tests, and aggregate-asphalt binder and aggregate-mastic adhesion tests. The results highlighted convergent trends, indicating that the active behavior of the fillers in the mastic formulation is not related to the size of the particles, but rather to their form, surface texture,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characterization; Fillers; Granite; Limestone; Bituminous mastics. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200995 |
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| Prado,Marcelo Ribeiro Vilela; Moraes,Milton Ferreira de; Ramos,Fabrício Tomaz; Santos,Carlos Leandro Rodrigues do; Campos,David Vilas Boas de; Barros,Gisele Teixeira. |
| ABSTRACT Mato Grosso, with a total area of 903357 km², does not have an official methodology for estimating soil potential acidity (H + Al), and determination of H + Al using the standard method is onerous and time consuming. The objective of this study was to compare estimated values of H + Al determined using the standard calcium acetate method with those obtained using three buffer methods, namely, the Shoemaker, McLean, and Pratt (SMP) buffer, Sikora buffer, and Santa Maria buffer (SMB) methods, with samples of the main classes of cultivated soils in the state of Mato Grosso. A total of 196 soil samples were collected from the arable layer (0-20 cm) in agropastoral and adjacent native systems. Statistical models were obtained and compared with models... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Limestone; SMP buffer; Sikora buffer; Santa Maria buffer. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100207 |
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| Comin,Jucinei José; Ambrosini,Vítor Gabriel; Rosa,Daniel José; Basso,Alex; Loss,Arcângelo; Melo,George Wellington Bastos de; Lovato,Paulo Emílio; Lourenzi,Cledimar Rogério; Ricachenevsky,Felipe Klein; Brunetto,Gustavo. |
| ABSTRACT: Soils which are cultivated with grapevines have high available copper (Cu) content, which can be toxic to cover crops cohabiting vineyards, such as black oats. This study aimed to assess the effect of liming in reducing Cu toxicity in black oats grown in sandy soils. Samples of a Typic Hapludalf were collected at 0-20cm, dried and subjected to the addition of Cu (0 to 50Mg kg-1) and limestone (0, 1.5, and 3.0Mg ha-1). The soil was placed in a rhizobox and black oats were grown for 30 days. We assessed root and shoot dry matter production, copper (Cu), calcium (Ca) and magnesium (Mg) contents in the tissues; Cu content in the root symplast and apoplast, as well as Cu, carbon and pH values in the rhizosphere and bulk soil. Liming reduced Cu... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metal; Phytotoxicity; Limestone; Rhizosphere.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000400252 |
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| SOUSA, D. M. G. de; VILELA, L.; LOBATO, E.; SOARES, W. V.. |
| A pecuária no Cerrado baseou-se, por muitos anos, na exploração de pastagens nativas. Nas três últimas décadas, o crescimento acentuado do rebanho bovino na região e o incremento de até cinco vezes na capacidade de suporte das pastagens deveu-se ao aumento da área com grandes gramíneas forrageiras, provenientes do continente africano, especialmente as do gênero Brachiaria e o Andropogon gayanus cv. Planaltina. Estabelecidas sem adubação ou com o efeito residual de modestas adubações da cultura do arroz, sem adubação de manutenção e submetidas a manejo inadequado, extensas áreas dessas pastagens encontram-se em variados graus de degradação. A ausência de adubação de reposição durante décadas de extração dos nutrientes tornou necessária a recuperação dessas... |
| Tipo: Folhetos |
Palavras-chave: Correção do solo; Soil fertilizers; Adubo; Cerrado; Fertilidade do Solo; Gesso; Pastagem; Solo; Gypsum; Limestone; Pastures; Soil amendments; Soil fertility. |
| Ano: 2001 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566086 |
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| Cheek, M.; Jebb, M.; Murphy, B.; Mambor, F.. |
| A review of new data relating to Nepenthes insignis in Indonesia indicates that three taxa in section Insignes, not one, are present in New Guinea. One of these, endemic to the limestone of the island of Biak, is formally named as Nepenthes biak and assessed as Critically Endangered; the other, from limestone of the Raja Ampat islands is provisionally distinguished as Nepenthes sp. Raja Ampat, since only images are available. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Biak; Critically Endangered; Endemic; Limestone; Papua Barat; Raja Ampat. |
| Ano: 2018 |
URL: http://www.repository.naturalis.nl/record/642610 |
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| Registros recuperados: 33 | |
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