Microclimatological alterations caused by plastic screen uses

The objective of this study was to determine the micrometeorological alterations caused by plastic screen uses in agriculture. The experiment with lettuce was carried out in Alegre (20º45’S, 41º28’W - 150 m), Espírito Santo State, Brazil, during September to December, 1996. Measurements were done under plastic screen with 0; 30; 50, and 70% of solar radiation reduction (attenuation) according to commercial specification. Results showed that attenuation was less than commercial specification and there was a diurnal fluctuation as a function of solar zenital angle. A reduction in soil temperature under shading was also observed.

microclimate; plastic screen; shading