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| Registros recuperados: 52 | |
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| Muraoka,Takashi; Neptune,A. M. Louis. |
| Foram comparados diversos adubos fosfatados, tais como superfosfato simples, superfosfato concentrado, fosforita de Olinda, termofosíato, polifosfato de amônio, fosfato diamônico (DAP), metafosfato de potássio e metafosfato de cálcio, em duas unidades de solos, um regossol e um latossol. O experimento foi realizado em casa de vegetação com trigo (Triticum aestivum). Considerando o peso da matéria seca e a concentração do fósforo nas plantas, verificou-se que os adubos superfosfato concentrado, polifosfato de ainônio e DAP deram melhores resultados no regossol, enquanto que no latossol destacaram-se os adubos polifosfato de amônio, DAP e o metafosfato de potássio. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1977 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761977000100045 |
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| Muraoka,Takashi; Neptune,André M. Louis. |
| Estudou-se efeito residual de oito fontes de fósforo em dois solos de baixo teor em fósforo, na cultura de milho (Zea mays L.). Os experimentos foram realizados na casa de vegetação. Pela avaliação do peso de matéria seca e quantidade de nitrogênio, fósforo e potássio absorvidos, constatou-se que os fertilizantes com melhor efeito residual foram metafosfato de cálcio e metafosfato de potássio, seguidos por termofosfato e fosforita de Olinda, no regosol. No latosol não se observou diferenças estatisticamente significativas para peso de materia seca, mas de uma maneira geral o metafosfato de cálcio, fosforita de Olinda e metafosfato de potássio foram os melhores. Os fertilizantes com menor efeito residual foram os que contem alto teor em fósforo solúvel em... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1978 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761978000100029 |
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| Boaretto,Antonio Enedi; Spolidorio,Eduardo Scarpari; Freitas,José Guilherme de; Trivelin,Paulo Cesar Ocheuze; Muraoka,Takashi; Cantarella,Heitor. |
| The wheat crop in São Paulo State, Brazil, is fertilized with N, P and K. The rate of applied N (0 to 120 kg.ha-1) depends on the previous grown crop and the irrigation possibility. The response of wheat to rates and time of N application and the fate of N applied to irrigated wheat were studied during two years. Residual N recovery by soybean grown after the wheat was also studied. The maximum grain productivity was obtained with 92 kg.ha-1 of N. The efficiency of 15N-urea utilization ranged from 52% to 85%. The main loss of applied 15N, 5% to 12% occurred as ammonia volatilized from urea applied on soil surface. The N loss by leaching even at the N rate of 135 kg.ha-1, was less than 1% of applied 15N, due to the low amount of rainfall during the wheat... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen fertilization; Efficiency; Ammonia; Volatilization. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052004000200011 |
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| Scivittaro,Walkyria Bueno; Muraoka,Takashi; Boaretto,Antonio Enedi; Trivelin,Paulo César Ocheuze. |
| Because of their potential for N2 biological fixation, legumes are an alternative source of nitrogen to crops, and can even replace or supplement mineral fertilization. A greenhouse experiment was carried out to evaluate temporal patterns of velvet bean (Mucuna aterrima) green manure release of nitrogen to rice plants, and to study the fate of nitrogen from velvet bean in rice cultivation. The isotopic dilution methodology was used. Treatments consisted of a control and 10 incubation periods of soil fertilized with 15N-labeled velvet bean (0, 20, 40, 60, 90, 120, 150, 180, 210, and 240 days). The plant material was previously chopped, sifted (10 mm mesh sieve) and oven-dried (65ºC). Incubation of the plant material (2.2 g kg-1 soil) was initiated by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mucuna aterrima; Effectiveness; Recovery; Losses. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200014 |
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| Boaretto,Antonio Enedi; Schiavinato Neto,Plácido; Muraoka,Takashi; Oliveira,Mauro Wagner; Trivelin,Paulo César Ochezue. |
| Laranjeiras em estágio de formação receberam adubação foliar com uréia (15N). As folhas absorveram, nas 48 horas após a adubação foliar, 52% do N aplicado. Em relação ao N aplicado nas folhas das mudas, 38, 39, 23 e 15% foram recuperados nas plantas coletadas aos 75, 120, 180 e 360 dias após o transplante para os vasos, respectivamente. A adubação foliar das mudas não teve efeitos significativos no peso de matéria seca e no acúmulo de N durante o primeiro ano após o transplante. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adubação foliar; 15N; Citrus; Uréia. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300015 |
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| Guerra,Fernando; Trevizam,Anderson Ricardo; Muraoka,Takashi; Marcante,Nericlenes Chaves; Canniatti-Brazaca,Solange Guidolin. |
| Ingestion of vegetables containing heavy metals is one of the main ways in which these elements enter the human body. Once entered, heavy metals are deposited in bone and fat tissues, overlapping noble minerals. Slowly released into the body, heavy metals can cause an array of diseases. This study aimed to investigate the concentrations of cadmium, nickel, lead, cobalt and chromium in the most frequently consumed foodstuff in the São Paulo State, Brazil and to compare the heavy metal contents with the permissible limits established by the Brazilian legislation. A value of intake of heavy metals in human diets was also calculated to estimate the risk to human health. Vegetable samples were collected at the São Paulo General Warehousing and Centers Company,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Contamination; Food chain; Potentially toxic element; Daily intake; Consumption habit. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100008 |
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| Villanueva,Felipe Carlos Alvarez; Muraoka,Takashi; Trevizam,Anderson Ricardo; Franzini,Vinicius Ide; Rocha,Alexandre Prado. |
| Eucalyptus plantation in Brazil is generally set on low fertility soils, therefore phosphorus (P) fertilization is mandatory and increases the cost of plantation operation. Using species that more efficiently uptake phosphorus from less soluble sources is an interesting option. However, little is known about eucalyptus regarding its ability of using less soluble forms of phosphorus. The use of P by eucalyptus (E. urophylla, E. grandis, and E. urophylla <FONT FACE=Symbol>´</FONT> E. grandis) was studied in greenhouse using a loamy-textured, hipodystrophic Typic Haplustox from the Cerrado region, and 32P isotopic method. The P sources tested were triple superphosphate (TSP), phosphate rock (PR) and the triple superphosphate mixed with PR... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: L value; P sources; Radioisotope. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100010 |
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| Duete,Robson Rui Cotrim; Muraoka,Takashi; Silva,Edson Cabral da; Trivelin,Paulo César Ocheuze; Ambrosano,Edmilson José. |
| O N é o nutriente absorvido em maior quantidade pelo milho, o que mais influencia a produtividade de grãos e o de manejo mais complexo. O objetivo deste trabalho foi avaliar o efeito de doses e parcelamentos de N, na forma de uréia 15N, sobre a produtividade de grãos, o aproveitamento do N do fertilizante e a quantidade de N nativo do solo absorvida pelo milho em um Latossolo Vermelho. O delineamento experimental foi o de blocos casualizados com nove tratamentos e quatro repetições, compreendido de cinco doses de N: 0, 55, 95, 135 e 175 kg ha-1 de N, aplicando-se 15 kg na semeadura e o restante em diferentes estratégias de parcelamentos: 40 e 80 kg ha-1 no estádio de oito folhas ou ½ no estádio de quatro folhas + ½ no estádio de oito folhas; 120 kg ha-1... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Fertilizante 15N; N nativo do solo; Dose de N; Parcelamento de N. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000100016 |
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| Silva,Edson Cabral da; Muraoka,Takashi; Buzetti,Salatiér; Trivelin,Paulo César Ocheuze. |
| O objetivo deste trabalho foi definir a melhor dose e época de aplicação, e a eficiência de utilização do N, utilizando-se uréia marcada com 15N, pelo milho cultivado sob plantio direto, em sucessão à crotalária (Crotalaria juncea), ao milheto (Pennisetum americanum) e à vegetação espontânea (pousio), em um Latossolo Vermelho no Cerrado. O delineamento experimental foi o de blocos ao acaso, com 24 tratamentos e quatro repetições, em esquema fatorial incompleto, 3x3x2 + 6: três doses de N (80, 130 e 180 kg ha-1); três sistemas de cobertura do solo (crotalária, milheto e pousio); duas épocas de aplicação do N (estádio quatro ou oito folhas); e seis tratamentos adicionais (três sem aplicação de N e três que receberam 30 kg ha-1 de N na semeadura). O cultivo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Fertilizante 15N; Pousio; Adubo verde; Cerrado; Plantio direto. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300015 |
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| Silva,Alinne da; Franzini,Vinícius I.; Piccolla,Cristiano D.; Muraoka,Takashi. |
| ABSTRACT The common bean has been considered to have low biological nitrogen fixation capacity; however, this process can be made more effective with molybdenum (Mo) supplementation. The objective of this study was to evaluate the influence of Mo rates on the growth and biological nitrogen fixation by two Brazilian common bean cultivars using the 15N isotope dilution technique. The experiment was performed in 2014 in a completely randomized design arranged in a 5 x 3 factorial scheme, corresponding to 5 rates of Mo (control, 40, 80, 120 and 240 g ha-1), the common bean cultivars Aporé, Ouro Negro and NORH-54 (a non-nodulating common bean cultivar), and three replicates. The application of Mo and the inoculation with rhizobia strains contributed to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Isotope dilution; Labeled fertilizer; Rhizobia. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000200100 |
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| Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Muraoka,Takashi. |
| Nitrogen (15N) released from sunnhemp (Crotalaria juncea), velvet bean (Mucuna aterrima) and from Phaseolus bean residues was evaluated after incubation of the plant material in an Eutrudox and a Paleudalf, in a greenhouse experiment with pots containing 6 kg of air dried soil. Dry matter equivalent to 13 Mg ha-1 of Phaseolus bean residues and the same amount of above ground parts of the leguminous species, associated to 2.7 and 2.2 Mg ha-1 of roots of sunnhemp and velvet bean respectively, were incorporated into the soil. A completely randomized experimental design was adopted, with treatments arranged in a 2 <FONT FACE=Symbol>´</FONT> 3 + 1 factorial, replicated three times. The treatments were the following: two soils (Eutrudox and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineral nitrogen; Green manure; Nitrogen-15; N-mineralization. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100020 |
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| Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Schammass,Eliana Aparecida; Muraoka,Takashi; Guirado,Nivaldo; Rossi,Fabrício. |
| Due to their nitrogen fixation potential, legumes represent an alternative for supplying nutrients, substituting or complementing mineral fertilization in cropping systems involving green manuring. The objective of this study was to evaluate the N balance in a soil-plant system involving green manures [sunn hemp (Crotalaria juncea L.) and velvet bean (Mucuna aterrima Piper & Tracy)], both labeled with 15N. They were incorporated into two soils of contrasting textural classes: a clayey Eutrudox and a sandy-clayey Paleudalf, both cultivated with corn. The research was carried out in a greenhouse, using pots containing 6 kg of air dried soil, to which the equivalent to 13 Mg ha-1 dry matter of above-ground mass plus 2.7 or 2.2 Mg ha-1 of velvet bean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crotalaria juncea L. Mucuna aterrima Piper & Tracy mineralization 15N isotope dilution. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300014 |
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| Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Rossetto,Raffaella; Muraoka,Takashi; Bendassolli,José Albertino; Ambrosano,Gláucia Maria Bovi; Tamiso,Luciano Grassi; Vieira,Felipe de Campos; Prada Neto,Ithamar. |
| Most studies dealing with the utilization of 15N labeled plant material do not present details about the labeling technique. This is especially relevant for legume species since biological nitrogen fixation difficults plant enrichment. A technique was developed for labeling leguminous plant tissue with 15N to obtain labeled material for nitrogen dynamics studies. Sun hemp (Crotalaria juncea L.) was grown on a Paleudalf, under field conditions. An amount of 58.32 g of urea with 70.57 ± 0.04 atom % 15N was sprayed three times on plants grown on eight 6-m²-plots. The labelled material presented 2.412 atom % 15N in a total dry matter equivalent to 9 Mg ha-1 This degree of enrichment enables the use of the green manure in pot or field experiments requiring... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 15N -fertilizer; Labeled legumes; Green manure. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100027 |
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| Murbach,Marcos Roberto; Boaretto,Antonio Enedi; Muraoka,Takashi; Souza,Euclides Caxambu Alexandrino de. |
| Few reports have been presented on nutrient cycling in rubber tree plantations (Hevea brasiliensis Muell. Arg.). This experiment was carried out to evaluate: the effect of K rates on the amount of nutrients transfered to the soil in a 13-year old Hevea brasilensis RRIM 600 clone plantation, nutrient retranslocation from the leaves before falling to the soil, and nutrient loss by dry rubber export. The experiment started in 1998 and potassium was applied at the rates of 0, 40, 80 and 160 kg ha-1 of K2O under the crowns of 40 rubber trees of each plot. Literfall collectors, five per plot, were randomly distributed within the plots under the trees. The accumulated literfall was collected monthly during one year. The coagulated rubber latex from each plot was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litterfall; Fertilization; Nutrition; Rubber; Nutrient exportation. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200021 |
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| Silva,Edson Cabral da; Muraoka,Takashi; Franzini,Vinícius Ide; Villanueva,Felipe Carlos Alvarez; Buzetti,Salatiér; Moreti,Dolorice. |
| The objective of this work was to evaluate the utilization by corn plants of P from triple superphosphate fertilizer labeled with 32P (32P‑TSP), and of P from soil as affected by N rates and by the green manures (GM) sunn hemp (Crotalaria juncea) and millet (Pennisetum glaucum). The experiment was carried out using pots filled with 5 kg Oxisol (Rhodic Hapludox). A completely randomized design was used, in a 4x4x2 factorial arrangement, with four replicates. The treatments were: four P rates as TSP (0, 0.175, 0.350, and 0.700 g P per pot); four N rates as urea (0, 0.75, 1.50, and 2.25 g N per pot); and sunn hemp or millet as green manure. The additions of N and P by the GM were taken into account. After grain physiologic maturation, corn dry matter, P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Cover crop; Isotopic dilution; Oxisol; Radioisotope; Urea. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000800016 |
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| Ambrosano,Edmilson José; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Schammas,Eliana Aparecida; Dias,Fábio Luis Ferreira; Rossi,Fabrício; Trivelin,Paulo Cesar Ocheuze; Muraoka,Takashi; Sachs,Raquel Castellucci Caruso; Azcón,Rozario. |
| Estudou-se o efeito do cultivo prévio de leguminosas sobre a produtividade e lucratividade da cana-de-açúcar. Foram determinados a produtividade de biomassa, o acúmulo de nutrientes das leguminosas, a ocorrência natural de fungos micorrízicos arbusculares, bem como o efeito das leguminosas sobre a população de nematoides do gênero Pratylenchus à cana-de-açúcar. O experimento foi desenvolvido em Piracicaba (SP), Brasil, em solo classificado como Argissolo Vermelho-Amarelo distrófico, utilizando-se a cultivar de cana-de-açúcar (Saccharum spp.) IAC87-3396. As avaliações dos efeitos do cultivo prévio das leguminosas foram realizadas durante cinco cortes consecutivos. Os tratamentos consistiram do cultivo prévio das leguminosas: Amendoim (Arachis hypogaea L) -... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp. Arachis hypogaea L. Crotalaria juncea L. Mucuna aterrima (Piper & Tracy) Holland Pratylenchus spp. adubos verdes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400012 |
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| Franzini,Vinícius Ide; Muraoka,Takashi; Mendes,Fernanda Latanze. |
| The availability of phosphorus (P) from " Patos de Minas" phosphate rock (PR) can be improved if it is applied mixed with a water-soluble P source. The objective of this study was to evaluate 32P as a tracer to quantify the effect of the ratio of mixtures of triple superphosphate (TSP) with PR and the rates of application on P availability from PR. Two experiments were conducted in a greenhouse utilizing corn (Zea mays L.) plants as test crop. In the first experiment, the P sources were applied at the rate of 90 mg P kg-1 soil either separately or as compacted mixtures in several TSP:PR ratios (100:0, 80:20, 60:40, 50:50, 40:60, 20:80 and 0:100 calculated on the basis of the total P content). In the second experiment, the TSP was applied alone or as 50:50... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Typic Haplustox; Relative agronomic effectiveness; Phosphorus recovery; Radioisotope. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100010 |
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| Abreu Jr.,Cássio Hamilton; Muraoka,Takashi; Lavorante,André Fernando. |
| In soils of tropical climate regions the high acidity and the presence of exchangeable aluminum (Al3+), associated to low fertility, are the main restrainting factors for agricultural production. A laboratory experiment was conducted using 26 soils of different Brazilian regions, to investigate soil acidity components, giving emphasis to Al and their relations with chemical properties. The pH correlated positively with P, Ca, Mg, K, BS, CEC and V% values, and negatively with Al saturation. The Al3+ was the predominant exchangeable cation in 32% of the soils with pH below 5.6. The KCl titratable H+ represents the hydroxi-Al(OH)x complex with low stability and the Wolf-Morgan extracted Al corresponds to the exchangeable + non-exchangeable Al species. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Total acidity; Exchangeable acidity; PH; Aluminum in soil. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200019 |
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| Registros recuperados: 52 | |
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