CONSTRUÇÃO E CALIBRAÇÃO DE LISÍMETROS DE PESAGEM PARA DETERMINAÇÃO DA EVAPOTRANSPIRAÇÃO E COEFICIENTE DE CULTIVO EM VIDEIRA DE VINHO cv. SYRAH

Nascimento, Eliel Ferreira do; Campeche, Luís Fernando de Souza Magno; Bassoi, L. H.; Silva, Juliano Athayde; Lima, A. C. M.; Pereira, Fernanda Aparecida Castro

doi:10.15809/irriga.2011v16n3p271

Cited by 14 publications

(18 citation statements)

References 13 publications

(14 reference statements)

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“…The lysimeters were made of metal sheets with dimensions of 1.0 x 1.0 m at the base and 0.7 m of depth, mounted on transverse bars to concentrate all the mass of the set on one load cell located in the center of the system (Carvalho et al, 2007). The calibration of the lysimeters followed the methodology presented by Nascimento et al (2011), obtaining the equations M = 1407.5*(L) -1,077.7 and M = 1372.5*(L) -1,008.5, respectively, for the lysimeters cultivated with the intercropping and in monoculture, in which M is the mass of the set (kg) and L the reading of the load cell (mV).…”

Section: Methodsmentioning

confidence: 99%

Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean

Araújo

Sousa

Pereira

et al. 2017

Rev. bras. eng. agríc. ambient.

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This study was carried out to determine the evapotranspiration (ETc) and crop coefficients (Kc) for four stages of “Caatingueiro” corn under the climate condition of Seropédica, RJ, Brazil, using weighing lysimeters. The field trial occurred in 2015, from March 18 to June 25, in two areas cultivated with “Caatingueiro’ corn intercropped with jack bean and in monoculture. The reference evapotranspiration (ETo) was estimated by the FAO-56 Penman-Monteith model and the Kc values were determined by the ratio between ETc and ETo. The Kc values obtained for the intercropping and monoculture systems, were respectively: 0.78 (I); 1.01 (II); 1.10 (III) and 1.01 (IV), and 0.62 (I); 0.92 (II); 1.27 (III) and 0.81 (IV), and they were different from the values presented by FAO.

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Section: Methodsmentioning

confidence: 99%

Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean

Araújo

Sousa

Pereira

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…De acordo com Nascimento et al (2011) e Flumignan (2011, a exatidão do equipamento, usualmente, é avaliada por meio do erro padrão (EP). Desta forma, neste estudo, o erro padrão para o sensor variou de 0,602 a 0,643 kg (0,453 a 0,484 mm de ETo) e para o manômetro de 0,424 a 1,050 kg(0,319 a 0,791 mm de ETo).…”

Section: Análise Do Desempenhounclassified

Desempenho De Um Lisímetro De Pesagem Hidráulica Com Sensor De Pressão Hidrostática E Sistema Manométrico

Lima

Montenegro

Filho

et al. 2013

R_I

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Hydraulic weighing lysimeters have been widely used and improved to minimize operational problems, and provide good accuracy for detection of changes in soil water content under field conditions. The objectives of this study were to construct, install and calibrate a hydraulic weighing lysimeter with a hydrostatic pressure sensor for automation of readings, and analyze its performance as compared to the traditional reading system with mercury Lima, et. al. 541Irriga, Botucatu, v. 18, n. 3, p. 540-557, julho-setembro, 2013 piston. The lysimeter consisted of a tank with internal glass fiber, circular edge area of 1.32 m² and volume of 1 m³, and a weighing system with three hydraulic flexible pillow of butyl nylon 100 mm in diameter. Calibration was conducted in known mass containers, which represented a range of mass variation of 50 mm. The results showed high linearity between mass variation and the sensor and manometer readings. Accuracy of 0.135 mm ETo recorded by the pressure gauge and up to 0.061 mm ETo by the sensor showed that the pressure sensor is more sensitive to mass variations than the lysimeter. Errors associated with hysteresis, estimates of mass variation and the average positional error were higher in the manometric system.

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“…The linear regression coefficient (b) varied fro m -66.5319 mm to -67.8924 mm, that is, a difference of 1.3605 mm, wh ich can be attributed to the differences in dead weights of each lysimeter. The mean absolute error varied fro m 0.0272 mm to 0.0382 mm, lo wer than those found by Mariano et al (2015), Nascimento et al (2011), Howell et al (1995, Allen & Fischer (1991) and Faria et al (2006) and similar to Campeche (2002). The mean square error varied fro m 0.0011 mm² to 0.0024 mm², it can be concluded that lysimeters are high ly accurate.…”

Section: Res Ults and Discussionmentioning

confidence: 63%

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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CONSTRUÇÃO E CALIBRAÇÃO DE LISÍMETROS DE PESAGEM PARA DETERMINAÇÃO DA EVAPOTRANSPIRAÇÃO E COEFICIENTE DE CULTIVO EM VIDEIRA DE VINHO cv. SYRAH

Cited by 14 publications

References 13 publications

Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean

Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean

Desempenho De Um Lisímetro De Pesagem Hidráulica Com Sensor De Pressão Hidrostática E Sistema Manométrico

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

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