Instalação e calibração de um lisímetro de pesagem no perímetro irrigado curu-Paraipaba-CE.

Abstract

The construction, installation, and calibration of a weighing lysimeter are described. The weighing lysimeter has a surface area of 2,25 m² , and was installed at Paraipaba, CE, Brazil, into a grass weather station field of one hectare. The lysimeter is similar to a design developed by Kirkham et al. (1984). A Platform-type eletronic scale was placed below the soil surface to measure the weight changes of the container of soil. The calibration of the lysimeter was conducted applying mass amounts equivalent to 80 mm of water. The lysimeter was sensitive to mass changes of 400g (equivalent to 0,18 mm) and higly linear (r²=0,9994), with less than 1% total error over the 80 mm range.