Horizontal spacialization of evaporation in protected environment in Botucatu - SP

Abstract

The management of irrigation water in a culture is important because it allows the rational use of this factor of production aimed at obtaining the maximum output per unit of water applied. Allied to this technology, the cultivation in protected environment enables continuous production at times of the year in which conditions are usually unfavorable to the field, allowing the supply of the domestic market in all seasons. The study was conducted in the experimental area of Department of Rural Engineering of the Paulista State University - UNESP, campus of Botucatu, to evaluate the spatial protected environment through the distribution of minievaporimeters to check the distribution of energy in three heights, 40, 80 and 120 cm from the ground and the horizontal specialization. The study was conducted in plastic greenhouse, with guidance Northwest-Southwest. The climatological variables, and the weekly evaporation of minievaporimeters were evaluated for 8 months. The results indicated that the spatial distribution of minievaporimeters showed that during the study period from 07th May to 16th July ocurred greater evaporation in the environment to 40 cm of soil, ie, during the coldest months. The period from July 30th to September 16th the highest evaporation occurred at 80 cm soil. The minievaporimeters installed to 120 cm of soil showed values less than or equal, in other times, regardless of the evaluation period. The west side of the environment had higher evaporation for the entire study period. There was more evaporation in the protected environment during the coldest months of the year for minievaporimeters which were near the ground.