This project was developed in the Faculty of Engineering - Unesp, Campus of Ilha Solteira, in the municipality of Ilha Solteira - São Paulo State. We studied the environmental behavior under two conditions of protected environment, with plastic covering the soil and bare soil. It was evaluated the quinquidial averages, averages values, maximum and minimum daily temperature and relative humidity; quinquidial averages of the daily average values of deficiency of saturation of water vapor; the density of total daily flow of radiation; from transmission to radiation in each shelter and the linear regressions to estimate the total daily radiation inside the shelter, according to the daily total radiation in field open. The protected environment reduced, in relation to the open field, the density of flow of solar radiation, with higher intensity in the shelter covered with thermal plastic film light-diffuser. The greatest effect of shelters occurred on the maximum temperature, with higher values the greenhouse covered with a conventional polyethylene film. There were no differences for air relative humidity between greenhouses. The black plastic mulching increased the soil temperature at 6 and 12 cm depth.
polyethylene; environment; microclimatic
