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| MACHADO, C. T. de T.; MACHADO, A. T.; FURLANI, A. M. C.; GUERRA, J. G. M.. |
| RESUMO: Experimentos de campo e sob condições controladas foram conduzidos para estudar a eficiência em fósforo (P) de variedades locais de milho. Em casa de vegetação, dezoito genótipos foram cultivados em solo, sob duas doses de P, com o objetivo de verificar diferenças quanto à produção de matéria seca e utilização de P. Detectou-se variabilidade entre variedades locais para utilização de P e respostas diferenciadas a doses aplicadas. Posteriormente, índices de eficiência ao P foram estimados em dez variedades, em três concentrações de P, em solução nutritiva, e em uma dose ótima de P em campo. Confirmou-se o comportamento diferenciado das variedades para produção de matéria seca e de grãos, conteúdo de P e índices de eficiência. Na última etapa, foram... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Nutrição fosfatada; Parâmetro cinético; Maize; Phosphorus nutrition; Kinetics parameters; Enzimatic activity.; Atividade Enzimática; Fósforo; Milho; Melhoramento Vegetal; Variedade; Zea Mays.; Genetic variation; Plant breeding; Varieties.. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569605 |
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| Silva,Daiana Alves da; Esteves,José Antônio de Fátima; Messias,Ueliton; Teixeira,Aurélio; Gonçalves,João Guilherme Ribeiro; Chiorato,Alisson Fernando; Carbonell,Sérgio Augusto Morais. |
| Common bean (Phaseolus vulgaris L.) is frequently grown in weathered soils with low phosphorus (P) availability, and this is one of the main limitations on its production. This study aimed to assess 20 common bean genotypes in a hydroponic system to select the best P concentration for inducing nutritional deficiency and to classify the genotypes in terms of nutrient utilization efficiency. The concentrations of P applied were 8.00, 4.00, 2.00 and 0.05 mg L¹. At 21 days, in the plot subjected to an application of the most severe stress, the 0.05 mg L¹ dose of P, had smaller plant size and early leaf abscission was observed. The 4.00 mg L¹ dose of P was the most efficient in inducing stress for discrimination of cultivars in terms of efficiency of use of P.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris L.; Phosphorus nutrition; Classification of genotypes for P; Hydroponics; P deficiency. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300008 |
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| Cardoso Filho,Júlio Alves; Lemos,Eurico Eduardo Pinto de; Santos,Tania Marta Carvalho dos; Caetano,Luis Carlos; Nogueira,Marco Antonio. |
| The objective of this study was to evaluate the mycorrhizal dependency of mangaba tree (Hancornia speciosa) plantlets, under increasing levels of phosphorus fertilization. The experimental design was completely randomized in a 4×5 factorial arrangement with three mycorrhizal fungi inocula - Gigaspora margarita, Glomus etunicatum, or a pool of native mycorrhizal fungi (Acaulospora longula, Glomus clarum, Gigaspora albida, Paraglomus sp.) -, and a nonmycorrhizal control, in combination with five levels of phosphorus applied to the substrate: 0, 25, 50, 75, and 100 mg kg-1. After 180 days of growth, plantlets with inoculation of native mycorrhizal pool produced more shoot and root dry biomass and had higher shoot phosphorus content and accumulation. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gigaspora margarita; Glomus etunicatum; Hancornia speciosa; Biofertilizers; Native mycorrhizal fungi; Phosphorus nutrition. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000700013 |
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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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