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| Oliveira Junior,Adilson de; Prochnow,Luís Ignácio; Klepker,Dirceu. |
| O objetivo deste trabalho foi avaliar a eficiência agronômica relativa de uma fonte de fósforo na cultura de soja [Glycine max (L.) Merrill.]. O superfosfato triplo foi a fonte-padrão, e o fosfato natural reativo Arad foi a fonte testada, ambos aplicados em diferentes doses, em área total ou no sulco de semeadura. Em outubro de 2004, o experimento foi instalado em Balsas, MA, em Latossolo Vermelho-Amarelo distrófico, textura argilosa e baixa disponibilidade de fósforo, conduzido com soja cultivar BRS Sambaíba por três safras (2004/2005 a 2006/2007); a terceira safra foi conduzida sob efeito residual das aplicações anteriores. De forma geral, não foram observadas diferenças quanto à localização da fonte-padrão, ao passo que a localização do fosfato natural... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Fertilizante fosfatado; Fósforo; Solo de cerrado. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000500010 |
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| Prochnow,Luís Ignácio; Biasioli,Gustavo Marques; Rodella,Arnaldo Antonio; Jesus,Sérgio Luís de; Montes,Célia Regina; Alleoni,Luís Reynaldo Ferracciú. |
| The concentration of orthophosphate ions released from Fe-K-P compounds (Fe3KH8(PO4)6 .6H2O and Fe3KH14(PO4)8 .4H2O) present in superphosphates increases with pH, which initially suggests that the agronomic effectiveness of P fertilizers containing high amounts of these compounds would also increase with soil pH but studies considering activity, instead of concentration, are necessary. With this purpose, both compounds were synthesized under laboratory conditions, characterized by elemental chemical analysis, optical microscopy, X ray diffractometry, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), and used in a solubility study. Solutions of 0.01, 0.05 and 0.1 mol L-1 NaCl with pH adjusted to 3.0, 4.0, 5.0, 5.5, 6.0, 6.5, 7.0... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphate fertilizers; Cationic impurities; Phosphorus activity; Phosphorus bioavailability. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832006000300008 |
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| Shigaki,Francirose; Sharpley,Andrew; Prochnow,Luís Ignácio. |
| Eutrophication has become a major threat to water quality in the U.S., Europe, and Australasia. In most cases, freshwater eutrophication is accelerated by increased inputs of phosphorus (P), of which agricultural runoff is now a major contributor, due to intensification of crop and animal production systems since the early 1990s'. Once little information is available on the impacts of Brazilian agriculture in water quality, recent changes in crop and animal production systems in Brazil were evaluated in the context of probable implications of the fate of P in agriculture. Between 1993 and 2003, there was 33% increase in the number of housed animals (i.e., beef, dairy cows, swine, and poultry), most in the South Region (i.e., Paraná, Rio Grande do Sul, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diffuse pollution; Eutrophication; Poultry production; Swine production; Surface runoff. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200013 |
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| Alleoni,Luís Reynaldo Ferracciú; Zambrosi,Fernando César Bachiega; Moreira,Silvino Guimarães; Prochnow,Luís Ignácio; Pauletti,Volnei. |
| No tillage areas are increasing in Brazil especially due to a general improvement in water and nutrient availability to plants. Few results have reported the effect of liming on soil electrochemical attributes in areas under the no tillage system. This study was conducted to evaluate the effect of liming (at the soil surface and incorporated to 0.2 m) on soil pH, point of zero salt effect (PZSE), electric potential, soil organic matter (SOM), and yield of soybean and corn, cultivated on an Typic Hapludox, submitted 12 years to no tillage. Rates of lime of 1/3, 2/3 and the total amount calculated for soil to reach a base saturation of 70 % (2.5 ton ha-1) were applied on soil surface. The full rate was also applied and incorporated to the 0.2 m depth. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PSSE; Organic matter; Electric potential. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100018 |
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| Oliveira Júnior,Adilson de; Prochnow,Luís Ignácio; Klepker,Dirceu. |
| Soybean (Glycine max L. Merrill) crop started to be planted in the Brazilian Cerrado in the 1970's, and this region currently contributes with 57% of total soybean production in Brazil. Under natural conditions in this region, the soils present chemical limitations such as low pH, low Cation Exchange Capacity, low nutrient availability, and moreover, clayey soils have a high P fixation capacity mainly due to high contents of Fe/Al oxides. Since P is the most limiting nutrient is this region, a study was performed in the state of Maranhão, Brazil, in a Typic Hapludox, with clayey texture and low available P (extracted by resin). Treatments were defined to evaluate soybean response to broadcast Arad phosphate rock (PR) plus banded triple superphosphate (TSP)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Glycine max L. Merrill; Oxisols; P source solubility; Phosphorus; Cerrado soils. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300016 |
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| Francisco,Eros Artur Bohac; Prochnow,Luís Ignácio; Toledo,Maria Cristina Motta de; Ferrari,Viviane Carillo; Jesus,Sérgio Luís de. |
| Optimization in the use of phosphate rocks is important and the residues of fertilizer production in the form of crandallite may be suitable for agronomic use after calcination. With the objective of evaluating the effect of thermal treatment of the aluminous phosphates of the crandallite group as related to solubility, crystalline structure and morphology, samples from the mine residues of three Brazilian phosphate deposits (Tapira-MG, Catalão-GO, and Juquiá-SP) were collected, air-dried, and screened to 100 mesh. Sub samples were thermally treated at 300, 500, 700, and 900°C for 2 hours. Treated and untreated materials were analyzed by X-ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectrometry, and for the total and soluble P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcination; Phosphate fertilizer; Phosphate impurities. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300009 |
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| Benedito,Daniela da Silva; Prochnow,Luís Ignácio; Silverol,Aline Carneiro; toledo,Maria Cristina Motta de. |
| A produção tradicional de fertilizantes fosfatados gera grandes volumes de rejeitos e entre estes estão materiais ricos em P, representando um bem mineral inutilizado. Para aproveitar esses rejeitos surgiu o processo Humifert, que tem como objetivo o tratamento ácido da mistura de minérios fosfáticos (elevado ou baixo teor de P) com material orgânico, incrementando a solubilidade do P contido no composto fertilizante, visando aumentar a eficiência agronômica (EA). Este trabalho objetivou avançar a pesquisa sobre o processo Humifert, com a realização de testes de funcionamento do equipamento e experimentos agronômicos, visando avaliar a EA dos compostos obtidos em relação à fonte tradicional de P. Foram realizados dois experimentos agronômicos, sendo um com... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fontes alternativas; Fertilizantes fosfatados; Matéria orgânica. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000100024 |
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