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| Dahroug,Zaryf; Santana,Natália Fernanda; Pagioro,Thomaz Aurélio. |
| Abstract Organic decomposition is a complex interaction between chemical, physical and biological processes, where the variety of aquatic vascular plants is essential for the trophic dynamics of freshwater ecosystems. The goal of this study was to determine the aquatic macrophyte Eichhornia azurea (Sw.) Kunth decomposition rate, the time relation with the limnological parameters, and whether this relationship is a result of decomposition processes. To that end, we collected water and leaves of E. azurea in Surf Leopoldo, PR. The experiment consisted of two treatments: 25 containers with 450 mL of water and 0.8 g of biomass dry weight were used with or without the addition of macrophytes. Samples were collected in triplicate at times 0, 3 h, 6 h, 12 h, 24... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Decomposition rate; Dry weight; Aquatic macrophyte; COD. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200279 |
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| Diniz,Ellen Rúbia; Santos,Ricardo Henrique Silva; Urquiaga,Segundo Sacramento; Peternelli,Luiz Alexandre; Barrella,Tatiana Pires; Freitas,Gilberto Bernardo de. |
| The objective of this work was to determine the effect of incorporation timing of the velvet bean (Stizolobium cinereum) (GM) on both organic broccoli yield and N status. Mineral N content in the soil, biologically fixed N recovery by broccoli, GM biomass decomposition and N release kinetics were also determined. Plots were fertilized with 12 Mg ha-1 of organic compost and received GM either at 0, 15, 30 or 45 days after transplant. Other treatments were compost (12 or 25 Mg ha-1), GM, mineral fertilizers and control (no fertilizer). The data were collected in four completely randomized blocks. GM decomposition increased mineral N content in soil as rapidly as mineral fertilizer or the supply of 25 Mg ha-1 of compost. The N half-life in GM (24 days) is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea; Stizolobium cinereum; Biological nitrogen fixation; Decomposition rate; N recovery. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000200008 |
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| Perin,Adriano; Santos,Ricardo Henrique Silva; Urquiaga,Segundo Sacramento; Cecon,Paulo Roberto; Guerra,José Guilherme Marinho; Freitas,Gilberto Bernardo de. |
| Commonly N release from legume residues is rapid in the tropics. Legume mixtures with grasses can result in slower nutrient release from residues, better matching the N requirements of the following crop. The objectives of this study were to evaluate the effects of the green manures sunnhemp (Crotalaria juncea) and millet (Pennisetum glaucum), alone or mixed, on the performance of a subsequent maize crop with and without the application of N-fertilizer. The experiment consisted of four randomized blocks, with split plots. The plot treatments consisted of previous cultivation of sunnhemp, millet, mixed sunnhemp+millet and weeds. The subplot treatments were 90 kg N ha-1 and absence of N-fertilizer. Substantial amounts of biological nitrogen fixation (BNF)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: N recovery; Biological nitrogen fixation; Decomposition rate; Intercropping. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500006 |
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