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| Streck,Nereu Augusto; Schneider,Flavio Miguel; Buriol,Galileo Adeli. |
| Solarization effects on soil temperature were evaluated during the autumn. The increase in soil temperature caused by the use of transparent polyethylene (PE) low tunnels over solarized nurseries, in subtropical central region of the Rio Grande do Sul state, Brazil, was also quantified. Treatments were: a) solarization with 100µ thickness PE (T1), b) solarization with 100µ thickness PE, covered with low tunnel (T2), c) solarization with 50µ thickness PE (T3), d) solarization with 50µ thickness PE, covered with low tunnel (T4), and e) bare soil (T). The low tunnel consisted of a 100µ thickness PE and measured 0.5m height in the center of the nursery. The results showed that additional use of low tunnels have increased, on the average, 5.0ºC over the maximum... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Solarization; Soil temperature; Nurseries; Low tunnels. |
| Ano: 1993 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781993000300027 |
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| Buriol,Galileo Adeli; Schneider,Flavio Miguel; Streck,Nereu Augusto; Medeiros,Sandro Luís Petter. |
| Environmental modifications caused by low tunnels made of perforated transparent polyethylene were determineted in an area alocated at the Federal University of Santa Maria, RS. The perforation densities were 100, 200, 300 and 400 perforations per square meter, corresponding respectively to 0.78% (T1), 1.57% CT2), 2.35% (T3) and 3.14% (T4) of area perforated. The results indicated that perforation density did not significantly affected solar energy availability. As perforation density increased there was a decrease on the average diurnal air temperature which demonstrated the viability of ventilating low tunnels with perforated plastic. It was also observed that inside the perforated tunnels the averages values for soil, air minimun and diurnal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Low tunnels; Management; Environment variables. |
| Ano: 1993 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781993000300001 |
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