Construção, automação e avaliação de um lisímetro de pesagem hidráulica
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Data
2013-12-12
Autores
Silva, Jeremias Caetano da
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Universidade Federal de Mato Grosso
Resumo
This paper describes the construction procedures, automation and evaluation of a
hydraulic weighing lysimeter for obtaining measurements of evapotranspiration in the
region Rondonópolis - MT, the positions in SAD 69 ( South American Datum ) system
are latitude 16°2’’15’ south and 54°38’’08’ west longitude at an altitude of 284 m. The
measurements obtained in lysimeters with those obtained by the following methods
Jensen - Haise, Penman-Monteith and Tank Class A. The lysimeter with an area of 1 m2
and 0.7 m deep, was constructed with iron plate. The same was coated by a jacket filled
with concrete layer and 0.10 m of soil, the first layer being filled with gravel, containing
within it three PVC pipes sieved, to facilitate drainage of water in the inner container
and central tube to monitor soil moisture. After filling the lysimeter calibration was
done with the addition and removal of weights 1 kg. Were also installed in the same
area an automatic weather station, a device data acquisition (datalloger) and class A pan
Periods of meteorological records of this work comprise of 01/08/2013 to 31/10/2013.
With the results we conclude the relationship between the difference of standard
weights 1 kg and the reading recorded at the gauge as the sensor were linear with (R2 =
0.99) in both the calibration and with central point load cells or load vertices of the
same showed high stability of the readings. The calibration coefficient (k) for the
datalogger was 1.017 and the average positional error was 4.09%. Daily measurements
obtained by lysimeter ETo that best correlated with the estimated values were the
Penman-Monteith (R2= 0.56) and compared with the estimates of Jensen Haise the
coefficient of determination was (R2= 0.36) and the Class A pan (R2= 0.48).
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SILVA, Jeremias Caetano da. Construção, automação e avaliação de um lisímetro de pesagem hidráulica. 2013. 61 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2013.