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| Franzini,Vinícius Ide; Muraoka,Takashi; Coraspe-León,Héctor Manuel; Mendes,Fernanda Latanze. |
| O objetivo deste trabalho foi avaliar o efeito do modo de aplicação do superfosfato triplo (SFT), do fosfato natural reativo de Gafsa e da mistura entre essas fontes no aproveitamento do fósforo (P) por plantas de milho e de soja. Os experimentos foram realizados em casa de vegetação, e as plantas foram cultivadas em vasos com Latossolo Vermelho-Amarelo distrófico. As fontes fosfatadas foram aplicadas isoladamente ou em misturas (proporção 1:1), à dose de 90 mg kg-1 de P, de modo não localizado ou localizado no solo. Para a quantificação do P absorvido pelas plantas das diferentes fontes, empregaram-se tratamentos com o solo e com o SFT marcados com 32P. O aproveitamento do fósforo do superfosfato triplo aplicado de forma localizada (9,8%) foi superior ao... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Zea mays; Diluição isotópica; Fertilizante fosfatado; Fosfato natural de Gafsa; Latossolo. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000900004 |
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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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| 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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| Matos,Gilson Sergio Bastos de; Fernandes,Antonio Rodrigues; Wadt,Paulo Guilherme Salvador; Pina,Antônio José de Abreu; Franzini,Vinícius Ide; Ramos,Helen Monique Nascimento. |
| ABSTRACT The oil palm crop has expanded significantly in the state of Pará, which has not been followed in a proportional manner by studies aiming at increasing yield through plant nutrition. The objective of this study was to evaluate general and specific norms of the Diagnosis and Recommendation Integrated System (DRIS) for genetic materials of oil palm (African and interspecific hybrid) at two ages (young and adult plants) and evaluate possible deficiencies in fertilization and soil correction practices. The DRIS norms were composed of means, standard deviations, and coefficients of variation of bivariate, specific, and general relationships among nutrients of 144 leaf samples. The DRIS norms specific for genetic material did not differ from the general... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Elaeis guineensis Jacq.; E. oleifera × E. guineensis; Eastern Amazonia; Plant nutrition. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100510 |
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| Silva,Edson Cabral da; Muraoka,Takashi; Franzini,Vinícius Ide; Sakadevan,Karuppan; Buzetti,Salatiér; Arf,Orivaldo; Bendassolli,José Alberto; Soares,Frederico Antônio Loureiro. |
| Abstract: The objective of this work was to evaluate the effects of cover crops on the yield of upland rice (Oryza sativa) grown under no-tillage system, in the presence and absence of N fertilizer, as well as to quantify, in the field, the use efficiency of N from urea and cover crops by upland rice, through the 15N isotope dilution technique. The field experiment was carried out in the municipality of Selvíria, in the state of Mato Grosso do Sul, Brazil, in an Oxisol (Rhodic Hapludox) in the Cerrado (Brazilian savanna) region. The experimental design was a randomized complete block with 15 treatments and four replicates, in a 5x3 factorial arrangement. The treatments were four cover crops (Crotalaria juncea, Cajanus cajan, Mucuna pruriens, and Pennisetum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Crop residues; Isotope technique; Mineralization; 15N; Nutrient cycling.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000600728 |
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