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| Registros recuperados: 15 | |
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| Miyazawa,Mário; Oliveira,Edson L. de; Parra,Mauro S.; Yamashita,Miyuki. |
| Toxicity and uptake of heavy metals of sewage sludge by beans (Phaseolus vulgaris L.) were evaluated in green house experiments. Treatments consisted of 1,0 ; 2,0 and 5,0% (m/m) of dry sewage sludge, collected from Londrina (Bom Retiro and ETE-Sul) and Curitiba (ETE-Belém and RALF). Bean ( variety IAPAR 57) was sown three times at 0, 120 and 240 days after the treatments have been applied. Contents of Cd, Cr, Co, Cu, Ni, and Pb in bean tissues cultivated with 5,0% (m/m) of all sewage sludge were similar to the control and Ba contents were reduced by increasing the quantity of sewage sludge in the soil. The Zn content in tissue bean incresed from 86 mg kg-1 of control to 462 mg kg-1 by applying 5% (m/m) of sewage sludge in soil, but plant beans did not show... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris L.; Heavy metal; Metal toxicity; Metal fractionation. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100012 |
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| Meda,Anderson R.; Cassiolato,Marcelo E.; Pavan,Marcos A.; Miyazawa,Mário. |
| A laboratory experiment was conducted to evaluate the effects of water soluble plant extracts on soil acidity. The plant materials were: black oat, oil seed radish, white and blue lupin, gray and dwarf mucuna, Crotalaria spectabilis and C. breviflora, millet, pigeon pea, star grass, mato grosso grass, coffee leaves, sugar cane leaves, rice straw, and wheat straw. Plant extracts were added on soil surface in a PVC soil column at a rate of 1.0 ml min-1. Both soil and drainage water were analyzed for pH, Ca, Al, and K. Plant extracts applied on the soil surface increased soil pH, exchangeable Ca ex and Kex and decreased Al ex. Oil seed radish, black oat, and blue lupin were the best and millet the worst materials to alleviate soil acidity. Oil seed radish... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant residue; Organic material; Leaching. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200012 |
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| Araújo,Ednaldo da Silva; Marsola,Tatiana; Miyazawa,Mário; Soares,Luís Henrique de Barros; Urquiaga,Segundo; Boddey,Robert Michael; Alves,Bruno José Rodrigues. |
| O objetivo deste trabalho foi calibrar uma câmara prática e de baixo custo, para quantificar a amônia volatilizada do solo. A calibração da câmara foi realizada pela técnica do balanço do isótopo 15N. A amônia volatilizada foi capturada por uma câmara semiaberta livre estática (SALE), confeccionada a partir de garrafa de plástico transparente de politereftalato de etileno (PET) de 2 L. O interior da câmara apresentava livre circulação de ar, e possuía uma lâmina de espuma de poliuretano, com 2,5 cm de largura e 25 cm de comprimento, pendurada verticalmente, com a extremidade inferior inserida em frasco com solução ácida, que mantinha a espuma saturada. A recuperação do 15N-NH3 no coletor aumentou de forma linear com o aumento da taxa de volatilização de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fator de emissão de amônia; Isótopo 15N; Sistema coletor de NH3; Ureia; Volatilização de amônia. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000700018 |
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| Meda,Anderson R.; Pavan,Marcos A.; Cassiolato,Marcelo E.; Miyazawa,Mário. |
| Low Ca and Mg are serious limitations to crop production in sandy soils of the northwest Paraná, Brazil. Thus soil samples of an Oxisol collected in this region were packed into 30cm long columns. Dolomite lime (2.0, 0.84, 0.30, and < 0.30 mm screen) was added on soil surface, then leached with deionized water. Thereafter, the columns were dismantled and the soil cut into 5cm segments for chemical analysis. Dolomite lime increased pHCaCl2,, KCl-exchangeable Ca and Mg and residual CO3 mostly in the top surface layers. Surface dolomite lime had no effect on pH, Ca, Mg, and CO3 in the leachate, independent on the lime particle size. These results indicated that surface dolomite lime application had no effect on subsoil composition and mostly of the calcium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Liming; Ca and Mg leaching; Subsoil acidity. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200014 |
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| Andrade,Emilene; Miyazawa,Mário; Pavan,Marcos A.; Oliveira,Edson L. de. |
| The objective of this study was to re-evaluate some aspects of the relative importance of organic matter on Mn solubility in acid soil conditions. Field study showed that black oats, oil seed radish, elephant grass, lupin, leucaena, and coffee leaves serving as mulch decreased Mn solubility as compared with bare soil. The decrease in Mn solubility with plant mulch was related to increase in soil moisture content. Laboratory study showed that increasing temperature from 25 to 100ºC increased Mn solubility and total soil organic carbon was little changed; from 150 to 200ºC increased both Mn solubility and organic carbon oxidation, and up to 300ºC decreased Mn solubility and stoped organic carbon oxidation . Aluminum solubility always increased with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant residue; Mulch; Organic carbon; Heavy metal; Micronutrient. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000100003 |
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| Sartor,Laércio Ricardo; Assmann,Alceu Luiz; Assmann,Tangriani Simioni; Bigolin,Paulo Egidio; Miyazawa,Mário; Carvalho,Paulo Cesar de Faccio. |
| Swine residue (SR) applied as nutrient source of crops such as corn, bean, soybean and wheat, besides representing an environmental-friendly way of disposing of organic waste resulting from swine production, may significantly increase grain yields, replacing mineral fertilizer. The objective was to evaluate the effect of SR rates on corn, common bean, soybean and wheat yields from 2002 to 2007, in comparison with mineral fertilizer. The experiment was carried out at the Instituto Agronômico do Paraná - IAPAR, Pato Branco, PR and consisted of increasing SR rates (0, 15, 30, 45, and 60 m³ ha-1) and one treatment with mineral fertilizer (NPK 4-30-10), using 250 kg ha-1 for bean and 300 kg ha-1 for corn, soybean and wheat. Also, in the treatment with mineral... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizer; Micronutrient; Foliar nitrogen; Organic residues; Foliar phosphorous. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200035 |
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| Cassiolato,Marcelo E.; Meda,Anderson R.; Pavan,Marcos A.; Miyazawa,Mário; Oliveira,José C. de. |
| The low mobility of the soluble components of surface-applied lime, limits their ability to reduce subsoil acidity in variable charge soils. Laboratory experiments were conducted with brazilian Oxisol to evaluate the effect of oat extracts on the mobility of surface applied calcium in form of CaCO3. The following oat cultivars were evaluated: Argentina 5VL3, UPF 90H400-2, IAPAR 61, IA96101-b, SI 83400, EMBRAPA 29, LD 9102, FAPA 1, ER 93247, ER 90148, ER 89144, ER 93152, Alpha 94124, Alpha 94206 and Preta comum. Oat extracts and lime were applied at rates of 10 and 5 Mg ha-1, respectively. Effect of lime without plant extracts on soil acidity was limited in the upper 10 cm of the profile. Lime in the presence of oat extracts increased pH and Ca ex and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Subsoil acidity; Ca-leaching; Plant residue. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500014 |
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| Miyazawa,Mário; Pavan,Marcos A.; Franchini,Júlio C.. |
| A baixa mobilidade do calcário aplicado na superfície do solo diminui sua eficiência na redução da acidez subsuperficial. Foram estudados os efeitos de alguns resíduos orgânicos sobre a mobilidade do calcário calcítico aplicado na superfície do solo em colunas de PVC (60 cm de altura por 15 cm de diâmetro). Avaliaram-se resíduos de aveia preta, trigo, centeio, mucuna cinza e leucena na dose equivalente a 40 Mg ha-1. Adicionaram-se os resíduos vegetais e o calcário na superfície do solo e, após um programa de irrigação equivalente a 1500 mm de chuva por ano, avaliaram-se o pH e os teores de Ca, Mg, K e Al trocáveis no solo e solúveis na água efluente. O efeito do calcário sem resíduos vegetais limitou-se aos primeiros 10 cm de profundidade. Os resíduos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Subsoil acidity; Ca leaching; Green manure. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000300001 |
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| Nunes,Fabrize Caroline; Miyazawa,Mário; Pavan,Marcos Antonio. |
| This work evaluated the effect of the natural organic acids on the uptake of Ca by the wheat roots in a hydroponic solution. The following organic acids were evaluated: citric, oxalic, tartaric, malic, malonic, maleic, DL-malic, p-hydroxybenzoic, aconitic, and salicilic. The organic acids neither enhanced the root growth nor increased Ca uptake. The salicilic and malic acids were highly toxic and decreased the root growth. The citric, tartaric, maleic, aconitic, and salicilic decreased the Ca uptake by the roots due to their higher capacity to form the stable complexes with Ca in solution at pH 6.0. Decreasing the Ca valence from Ca++ to CaL+ or CaL2(0) through the organic ligand complexation reactions decreased the Ca uptake. The results suggested that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nutrient uptake; Metal-organic complex; Organic ligand; Organic molecule. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100002 |
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| Franchini,Júlio C.; Pavan,Marcos A.; Miyazawa,Mário. |
| The objective of this study was to evaluate if cover crops can absorb P from the upper layers and transport it in their roots to subsoil layers. Samples of an Oxisol were placed in PVC columns. Super phosphate fertilizer was applied to the 0-10 cm soil surface layers. The cover crops tested were: Avena strigosa, Avena sativa, Secale cereale, Pisum sativum subsp arvense, Pisum sativum, Vicia villosa, Vicia sativa, Lupinus angustifoliu, Lupinus albus, and Triticum aestivum. After a growth period of 80 days the cover crop shoots were cut off and the soil was divided into 10cm layers and the roots of each layer were washed out. The roots and shoots were analyzed separated for total P contribution to the soil. Considerable amount of P was present in the roots... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphorus nutrition; Soil phosphorus; Green manure; No-tillage. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300007 |
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| Registros recuperados: 15 | |
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