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| Teixeira,Luiz Antonio Junqueira; Quaggio,José Antonio; Cantarella,Heitor; Mellis,Estêvão Vicari. |
| A field experiment with pineapple (Smooth Cayenne) was carried out on an Ultisol located in the city of Agudos (22º30'S; 49º03'W), in the state of São Paulo, Brazil, with the objective of investigating the effects of rates and sources of potassium fertilizer on plant growth and fruit yield. The experiment was a complete factorial design (4x3) with four rates (0, 175, 350, and 700 kg ha-1 of K2O) and three combinations of K sources (100% KCl, 100% K2SO4, and 40% K2SO4 + 60% KCl). Plant growth and fruit yield were evaluated. Biomass accumulation of pineapple plants was impaired by chlorine added with potassium chloride. Fruit yield increased with potassium fertilization. At high rates of K application, fertilization with K2SO4 showed better results than with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Potassium chloride; Potassium sulphate; Ananas comosus; K. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000200035 |
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| Teixeira,Luiz Antonio Junqueira; Quaggio,José Antonio; Cantarella,Heitor; Mellis,Estêvão Vicari. |
| A field experiment was carried out on an Ultisol located at the city of Agudos (22º30'S; 49º03'W), in the state of São Paulo, Brazil, in order to determine the effects of rates and sources of potassium fertilizer on nutritional status of 'Smooth Cayenne' pineapple and on some soil chemical properties. The experiment was a complete factorial design with four rates (0, 175, 350, and 700 kg ha-1 of K2O) and three combinations of K sources (100% KCl, 100% K2SO4 and 40% K2SO4 + 60% KCl). Soil samples were taken from the depths 0-20 cm, 20-40 cm and 40-60 cm at planting and 14 months after. Nutritional status of pineapple plants was assessed by means of tissue analysis. Soil K availability increased with application of K fertilizer, regardless of K sources. Soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant analysis; Soil analysis; Potassium chloride; Potassium sulphate; Ananas comosus; K. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000200036 |
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| Teixeira,Luiz Antonio Junqueira; Quaggio,José Antônio; Mellis,Estêvão Vicari. |
| O aumento da eficiência fertilizante tem sido cada vez mais almejado nas boas práticas de manejo da adubação de culturas, não somente buscando reduzir custos de produção, mas também reduzir possíveis impactos ambientais. Com o objetivo de avaliar a eficiência dos fertilizantes nitrogenados e potássicos no cultivo da bananeira, foram realizados dois experimentos de campo com a cultivar 'Nanicão' (Musa AAA, subgrupo Cavendish), no Planalto do Estado de São Paulo, durante quatro ciclos de produção. Esta região caracteriza-se por estação chuvosa no verão e seca no inverno. No primeiro experimento, avaliou-se a eficiência da aplicação das doses de N: 0; 200; 400 e 800 kg ha-1 e de K: 0; 300; 600 e 900 kg ha-1 de K2O, em sistema de cultivo irrigado, comparado ao... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eficiência de adubação; Nitrogênio; Potássio; Banana. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000100033 |
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| Mellis,Estêvão Vicari; Cruz,Mara Cristina Pessôa da; Casagrande,José Carlos. |
| There is little information on nickel adsorption by Brazilian soils. The objective of this experiment was to determine the effect of pH, organic matter, and iron oxides on nickel adsorption by three soils: a clayey Anionic "Rhodic" Acrudox, a sandy clay loam Anionic "Xanthic" Acrudox, and a clayey Rhodic Hapludalf. Soil samples were collected from the 0-0.2 m layer and treated to eliminate organic matter and iron oxides. The nickel adsorption was evaluated in the original samples and in those treated to remove organic matter and to remove both, organic matter and iron oxides, using 2 g soil + 20 mL of 0.01 mol L-1 CaCl2 solution containing 5 mg L-1 Ni, pH varying from 3.5 to 7.5. The nickel adsorption decreased with the elimination of organic matter. For... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ni adsorption; Tropical soils. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200011 |
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| Levy,Camila de Carvalho Braga; Mellis,Estêvão Vicari; Murrer,Marina Krey; Inglés,Carlos Repiso; Daynes,Cathal N.; Cavalli,Edilson; Chiba,Marcio Koiti. |
| ABSTRACT Although nickel (Ni) is recognized as plant nutrient since the turn of the 21st century, uncertainty remains about its optimum application rates and forms. This paper focuses on Ni application in soils, relating to its effect as a plant micronutrient. Specifically, the effect of Ni on the activity of urease in soybean plants is examined. The effects of applying four Ni rates in two different soil types were tested. A full factorial 2 × 4 blocked design experiment was established under controlled conditions. Ni rates (0, 0.25, 0.5 and1.0 mg of Ni·kg–1 of soil) were applied in two soils with contrasting clay contents. The addition of Ni increased the urease activity in soybean plants but was affected by soil textural differences. The highest urease... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urease; Clay; Sand; Oxisol; Glycine max. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300432 |
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| Mellis,Estêvão Vicari; Rodella,Arnaldo Antônio. |
| O objetivo deste trabalho foi avaliar o efeito do tempo de agitação no equilíbrio de adsorção em amostra de um Latossolo não tratado e tratado com lodo de esgoto da estação de tratamento (ETE) de Barueri, coletadas na camada 0-0,2 m. A influência do tempo de agitação na adsorção foi avaliada através da adição de 20 mL do eletrólito suporte Ca (NO3)2 0,01 mol L-1, em 2 g de terra, agitadas por 1 e 24 horas em triplicata contendo concentrações crescentes de cada metal. Os resultados foram avaliados através do teste de comparação de curvas (Teste F). De maneira geral, as amostras agitadas por 24 horas adsorveram mais metais que as amostras agitadas por 1 hora. Pelos resultados, permite-se concluir que para as amostras de solo estudadas o tempo de agitação de... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Sorção; Tempo de equilíbrio; Metais pesados. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052008000400021 |
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| Mellis,Estêvão Vicari; Casagrande,José Carlos; Soares,Marcio Roberto. |
| ABSTRACT Although nickel (Ni) has both important potential benefits and toxic effects in the environment, its behavior in tropical soils has not been well studied. Nickel adsorption-desorption in topsoil and subsoil samples of an acric Oxisol was studied at three pH values (from 3.0 to 8.0). Adsorption-desorption isotherms were elaborated from experiments with increasing Ni concentration (5 to 100 mg L-1), during 0, 4, and 12 weeks, using CaCl2 0.01 and 0.1 M as electrolytic support in order to also verify the effect of Ni-soil time contact and of ionic strength on the reaction. Experimental results of Ni adsorption fitted Langmuir model, which indicated that maximum Ni adsorption (71,440 mg kg-1) occurred at subsoil, after 12 weeks. Nickel affinity (KL)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorption; Bioavailability; Soil pollution; Heavy metal.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000100032 |
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