Test of a microlysimeter for measurement of soil evaporation

Engenharia Agrícola

Danilton L. Flumignan¹  Rogério T. De Faria²  Bruno P. Lena¹ 

[1],UNESP FCAV Departamento de Engenharia Rural

关键词: water management;    water balance;    lysimeters;    soil water;    manejo de água;    balanço hídrico;    lisímetro;    água no solo;   

DOI  :  10.1590/S0100-69162012000100009

来源: SciELO

【 摘 要 】

Quantifying soil evaporation is required on studies of soil water balance and applications aiming to improve water use efficiency by crops. The performance of a microlysimeter (ML) to measure soil evaporation under irrigation and non-irrigation was evaluated. The MLs were constructed using PVC tubes, with dimensions of 100 mm inner diameter, 150 mm depth and 2.5 mm wall thickness. Four MLs were uniformly distributed on the soil surface of two weighing lysimeters conducted under bare soil, previously installed at Iapar, in Londrina, PR, Brazil. The lysimeters had 1.4 m width, 1.9 m length and 1.3 m depth and were conducted with and without irrigation. Evaporation measurements by MLs (E ML) were compared with measurements by lysimeters (E L) during four different periods in the year. Differences between E ML and E L were small either for low or high atmospheric demand and also for either irrigated or non-irrigated conditions, which indicates that the ML tested here is suitable for measurement of soil evaporation.

【 授权许可】

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