Desempenho De Um Lisímetro De Pesagem Hidráulica Com Diferentes Sistemas De Leitura

Nascimento, Antônio Henrique Cardoso do; Montenegro, Suzana Maria Gico Lima; Filho, João Audifax Cézar de Albuquerque; Silva, Ênio Farias de França e; Lima, Nadielan da Silva

doi:10.15809/irriga.2016v1n01p232-245

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…They are supported in a weighing mechanis m that measures the mass variation of the system and transmits it as an electrical signal to a datalogger that registers the values at defined time intervals Hagenau et al, 2015). One of the difficult ies in using lysimeters is the high cost of construction and installation (Nascimento et al, 2016;Silva et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

High Precision Weighing Lysimeters for Evapotranspiration Measurements of Sugarcane Pre-Sprouted Plantlets

et al. 2018

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Sugarcane pre-sprouted plantlets (PSP) production system is an innovative method to enhance crop multiplication rate. Determination of crop evapotranspiration (ETc) is crucial for water requirement identification throughout the plant cycle for irrigation management. ETc can be satisfactorily measured by weighing lysimeters. The objective of the study was to construct and calibrate three low-cost weighing lysimeters to measure ETc of PSP. The built lysimeters had 0.6909 m² area (1179 mm x 586 mm), with 400 mm depth supported by 3 load cells. Lysimeters calibration showed excellent precision measurements, due to high linear correlation (R² = 1.0000) between electric signal and equivalent mass, high accuracy, confirmed by mean absolute error between 0.0272 and 0.0382 mm, mean square error between 0.0011 and 0.0024 mm² and Willmott's index of agreement (d) equal to unit. Maximum hysteresis (0.1951 mm) and hysteresis at full scale (0.4492%) did not compromise the evaluations. Daily ETc measurements showed variation of 0.27 mm among lysimeters and were coincident with daily course of reference evapotranspiration (ETo). The cost of the equipment was low, except for the data acquisition system. Therefore, lysimeters presented low cost and were adequate to measure ETc of PSP in greenhouse-grown.

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Section: Introductionmentioning

confidence: 99%

High Precision Weighing Lysimeters for Evapotranspiration Measurements of Sugarcane Pre-Sprouted Plantlets

et al. 2018

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Calibration of a Weighing Lysimeter for Measuring Cocoa Evapotranspiration

et al. 2020

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Well-operated and calibrated weighing lysimeters reliably determine the water demand of agricultural crops, and the quality of the data is evaluated through the error analyses attributed to the instrument. The objective of this study was to determine performance parameters of a weighing lysimeter and to evaluate its adequacy for the direct determination of cocoa crop evapotranspiration. The lysimeter with 1.44 m2 surface, supported on four load cells installed in the experimental area of the Graduate Program in Agricultural Engineering of the Universidade Federal do Recôncavo da Bahia, was calibrated at 3:00 a.m., using known masses at intervals of 02 minutes in five cycles of addition and removal. Data were collected using a datalogger coupled to four load cells with an individual capacity of 1000 kg, programmed to perform readings every 01 second, storing the averages of 15 minutes. The lysimeter showed excellent accuracy, with r2greater than 0.99 in the correlation between the standard masses and the signal of the load cells and standard error of linear regression estimate of 0.03 mm. The combination of repeatability and hysteresis errors with an uncertainty of 0.19% showed that the load cells have accuracy of ±0.07 mm, with resolution of 0.00033 mV, and sensitivity to detect mass changes below 0.1 mm, the system is adequate for direct measurement of cocoa ETc at time intervals of less than one hour.

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Desempenho De Um Lisímetro De Pesagem Hidráulica Com Diferentes Sistemas De Leitura

Cited by 2 publications

References 4 publications

High Precision Weighing Lysimeters for Evapotranspiration Measurements of Sugarcane Pre-Sprouted Plantlets

High Precision Weighing Lysimeters for Evapotranspiration Measurements of Sugarcane Pre-Sprouted Plantlets

Calibration of a Weighing Lysimeter for Measuring Cocoa Evapotranspiration

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