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	Provedor de dados Scientia Agricola (3) Rev. Bras. Ciênc. Solo (1) Autor Andrade,Alex Teixeira de (1) Bachmann,Silvia (1) Costa,Adriane da Rocha (1) Eichler-Löbermann,Bettina (1) Faquin,Valdemar (1) Farias,Samuel Christian Cohen (1) Fernandes,Luiz Arnaldo (1) Mariano,Isabela Orlando dos Santos (1) Melo,Vânia Silva de (1) Olibone,Dácio (1) Rodrigues,Possidônio Guimarães (1) Rosolem,Ciro Antonio (1) Ruivo,Maria de Lourdes Pinheiro (1) Silva Júnior,Mário Lopes da (1) Souza Júnior,João Cardoso de (1) Uptmoor,Ralf (1) Mais... Palavra-chave Phosphorus fractions (4) Amaranth (1) Anaerobic digestion (1) Conservation tillage (1) Extractors (1) Mixed cropping (1) Organic phosphorus (1) Oryza sativa (1) Reactive phosphate (1) Shifting cultivation (1) Soil enzymes (1) Superphosphate (1) Tropical soils (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2016 (2) 2010 (1) 2002 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Phosphorus Forms in Ultisol Submitted to Burning and Trituration of Vegetation in Eastern Amazon Rev. Bras. Ciênc. Solo Farias,Samuel Christian Cohen; Silva Júnior,Mário Lopes da; Ruivo,Maria de Lourdes Pinheiro; Rodrigues,Possidônio Guimarães; Melo,Vânia Silva de; Costa,Adriane da Rocha; Souza Júnior,João Cardoso de. ABSTRACT The use of fire to prepare agricultural areas is a technique still used by small farmers in eastern Amazon. This type of management changes the dynamics of soil nutrients, especially phosphorus, which constitutes the most limiting nutrient for crop production in tropical soils. This study was carried out to evaluate changes in phosphorus forms in an Argissolo Amarelo Distrófico (Ultisol) submitted to burning and trituration of secondary forest in eastern Amazon. The evaluated systems were: slash-and-burn of vegetation; slash-and-mulch of vegetation; and secondary vegetation. The labile, moderately labile, moderately recalcitrant, available and total phosphorus fractions were assessed at the soil depths of 0.00-0.05, 0.05-0.10 and 0.10-0.20 m. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Shifting cultivation; Tropical soils; Phosphorus fractions; Organic phosphorus. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100506 Phosphorus distribution and availability in untreated and mechanically separated biogas digestates Scientia Agricola Bachmann,Silvia; Uptmoor,Ralf; Eichler-Löbermann,Bettina. ABSTRACT Biogas digestates contain valuable nutrients but also have high water contents. Di-gestates were sampled from two different biogas facilities before and after solid-liquid separation and were analyzed with regard to their composition and phosphorus (P) fractions. Additionally, to investigate the P fertilizer effects of these digestates in comparison with undigested slurry or TripleSuper-P (TSP), they were applied in a pot experiment (6 kg soil per pot) in an amount corresponding to 200 mg P per pot in combination with various crops (amaranth, maize, maize + beans mixed cropping, sorghum). A separation of digestates resulted in higher P concentrations of the solid fraction in comparison with the liquid fraction. The proportion of the readily... Tipo: Info:eu-repo/semantics/article Palavras-chave: Phosphorus fractions; Anaerobic digestion; Amaranth; Mixed cropping; Soil enzymes. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100009 Phosphate fertilization and phosphorus forms in an Oxisol under no-till Scientia Agricola Olibone,Dácio; Rosolem,Ciro Antonio. Under no-till phosphorus (P) accumulates in a few centimeters of the topsoil layer. Plant residues left on the soil surface release P and organic acids, which may improve P availability and fertilizer efficiency, including both soluble (such as triple super phosphate) and less soluble sources (such as reactive natural phosphates). In this study, soybean response to P fertilizer and P forms in the top 40 cm of an Oxisol were evaluated after surface application of different phosphates in a 5-year-old no-till system. Treatments consisted of 0 or 80 kg ha-1 of total P2O5 applied on the soil surface, both as natural reactive phosphate (NRP) or triple super phosphate (TSP). In addition, 80 kg ha-1 of P2O5 were applied to subplots, in furrows below and beside the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Reactive phosphate; Superphosphate; Phosphorus fractions; Conservation tillage. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400014 Phosphorus critical levels and availability in lowland soils cultivated with flooded rice Scientia Agricola Mariano,Isabela Orlando dos Santos; Fernandes,Luiz Arnaldo; Faquin,Valdemar; Andrade,Alex Teixeira de. Lowland soils present a great potential for the flooded rice crop. This work aimed to estimate critical levels of P in waterlogged soils cultivated with rice using Mehlich 1 and anion exchange resin as soil-P extractors, compare the performance of these extractors as for the evaluation of the P availability, and study the soil-P fractions involved in the P nutrition of the rice crop. Studied soils consisted of four Histosols: Low Humic Gley (GP), Aluvial (A), Humic Gley (GH) and Bog Soil (O) which were previously cultivated with beans. The experimental design was completely randomized, in a factorial scheme, using four soils, five P rates (75, 150, 300, 500 and 800 mg dm-3) and two liming treatments (with and without liming), with three replicates. After... Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Phosphorus fractions; Extractors. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100017 Registros recuperados: 4 Primeira ... 1 ... Última

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