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Soil solarization for weed control in carrot PAB
MARENCO,RICARDO ANTONIO; LUSTOSA,DENISE CASTRO.
Soil solarization is a technique used for weed and plant disease control in regions with high levels of solar radiation. The effect of solarization (0, 3, 6, and 9 weeks) upon weed populations, carrot (Daucus carota L. cv. Brasília) yield and nematode infestation in carrot roots was studied in São Luís (2º35' S; 44º10' W), MA, Brazil, using transparent polyethylene films (100 and 150 mm of thickness). The maximum temperature at 5 cm of depth was about 10ºC warmer in solarized soil than in control plots. In the study 20 weed types were recorded. Solarization reduced weed biomass and density in about 50% of weed species, including Cyperus spp., Chamaecrista nictans var. paraguariensis (Chod & Hassl.) Irwin & Barneby, Marsypianthes chamaedrys...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Commelina benghalensis; Cyperus; Organic farming; Soil heating; Mulching; Plastic film covers; Soil desinfection; Nematode controls; Sandy soil.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000001000014
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Root temperature and energy consumption at different cable depths in electrically heated substrates Scientia Agricola
Fernandez,María Dolores; Rodriguez,Manuel Ramiro; Pidre,Rafael López; Teijeiro,Teresa.
A finite element method-based model of a substrate heated by an electric heating cable buried in a thermal isolated container was experimentally validated with root mean square error values of root zone temperature ranging 0.25 to 0.62 ºC. The two-dimensional transient model allowed variations in the physical properties of the substrate with temperature, water content and depth. The operation of nine configurations of a heating cable buried in sand at different depths (50 to 450 mm, at 50 mm intervals) at 200 mm spacing was simulated and assessed. The validated model was used to perform 24-h simulations applying boundary conditions, and substrate moisture content was experimentally obtained at a mean substrate surface temperature of 13.98 ºC. Such...
Tipo: Info:eu-repo/semantics/article Palavras-chave: FEM model; Heat consumption; Heating systems; Soil heating.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500001
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