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Queiroz S.J.,Instituto Agronomico SP | Dias G.M.,Instituto Agronomico SP | Tombolato A.F.C.,Instituto Agronomico SP
Acta Horticulturae | Year: 2015

The marketing of strelitzia is increasing due to its beauty, exotic and high postharvest longevity. It has potential to increase in world exports, therefore, this study aimed to develop technology for postharvest strelitzia, to maintain quality for export, to ensure product quality to the final consumer. The effect of the non-toxic pulsing solution and cold storage (10°C) on the longevity of stem and petal color were evaluated. The use of pulsing solution after cold storage increased longevity in some of the treatments, especially those stored for longer periods. The best pulsing solution found includes 40% sucrose and 150 ppm of citric acid. The pulsing solutions were effective in increasing longevity of the flowers, but for the concentrations tested no effect in the petal coloration was observed.

Borba R.P.,University of Campinas | de Camargo O.A.,Instituto Agronomico SP | Kira C.S.,Instituto Adolfo Lutz | Coscione A.R.,Instituto Agronomico SP
Environmental Earth Sciences | Year: 2015

The use of sewage sludge (SS) for agricultural purposes provides macronutrients and micronutrients and increases the soil organic matter. This study was conducted after 5 years of agricultural sludge application to a variable charge soil (clay loam-textured dark red dystroferric oxisol) in an experimental field at the Brazilian Federal Agriculture Research Institute in Jaguariúna, São Paulo. The mineralization of SS organic matter forms sulfate (SO42−) and ammonium (NH4+) or ammonia (NH3). Subsequently, nitrification of NH4+ or NH3 occurs, resulting in the formation of nitrite (NO2−) and NO3− which release H+ and increases the redox potential of the solution. In studied area, the SS organic matter decomposition favored the anion exclusion, which led to SO42−, NO2− and NO3− leaching along the profile. At 2 m, the soil solution showed pH and Eh values of 4.2 and 600 mV, respectively. In addition, the highest soil NO2− (27 mg/L), NO3− (1220 mg/L) and Al (20 mg/L) concentrations were observed at 2 m. The low pH and high Eh at 2 m potentially resulted from the oxidation of leached NO2−. Furthermore, the H+ released in solution due to nitrification was partially consumed during the solubilization of soil Al compounds, such as kaolinite and amorphous Al oxide. Geochemical modeling (GM) indicated that Al3+ in solution results from the solubilization of kaolinite and amorphous Al oxide. GM also highlights the importance of soil oxide protonation in buffering the soil solution acidity and in controlling the solubility of Al compounds and free Al in solution. © 2015, Springer-Verlag Berlin Heidelberg.

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