Laboratory temperature-compensating calibration procedure for soil water content determination by reflectometry

Vasconcelos, André Tavares; Tieppo, Rafael César; Dallacort, Rivanildo; Santi, Adalberto; Andréa, Maria Carolina da Silva

doi:10.15361/1984-5529.2018v46n3p221-225

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…Os valores de umidade do solo obtidos pelas sondas TDR foram ajustados pela equação proposta por Vasconcelos et al (2018), que realizou calibração dos sensores para o tipo de solo existente no local de estudo. Os dados de umidade do solo foram expressos em umidade volumétrica (m 3 m -3 ).…”

Section: Methodsunclassified

Temperatura e umidade do solo em função do uso de cobertura morta no cultivo de milho

et al. 2020

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Objetivou-se avaliar a influência de diferentes quantidades de cobertura vegetal morta sobre a temperatura e a umidade do solo cultivado com milho, em Tangará da Serra, MT. O experimento foi realizado no ano de 2016, na área experimental da Universidade do Estado de Mato Grosso (UNEMAT). Analisou-se a resposta da temperatura do solo em clima tropical com estação seca no inverno (Aw segundo Köppen), em um Latossolo Vermelho distroférrico na região sudoeste do estado de Mato Grosso. Foram avaliados três tratamentos com duas repetições, sendo: sem cobertura vegetal; cobertura com 4 t ha-1 de massa seca de braquiária e cobertura com 8 t ha-1 de massa seca de braquiária. A temperatura foi monitorada através de sensores termopar do tipo K, instalados nas profundidades de 5-10 e 20-25 cm e para a umidade utilizou-se sondas de reflectometria no domínio do tempo (TDR), instalados a 30 cm de profundidade. A temperatura do solo foi reduzida com o uso da palhada de braquiária, principalmente na fase inicial de desenvolvimento da planta. As maiores variações na temperatura ocorreram na profundidade de 5-10 cm. O solo coberto com 8 t ha-1 reduziu a temperatura máxima do solo em até 2,9 ºC, além disso, a cobertura do solo proporcionou a redução da amplitude térmica no solo de 5,3 e 5,8 ºC, com 4 e 8 t ha-1 , respectivamente. A umidade do solo foi maior no cultivo de milho com cobertura de 8 t ha-1 de braquiária. Palavras-chave adicionais: amplitude térmica; reflectometria no domínio do tempo; termopar; Zea mays L.

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Section: Methodsunclassified

Temperatura e umidade do solo em função do uso de cobertura morta no cultivo de milho

et al. 2020

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“…To monitor soil moisture, time-domain reflectometry probes (TDR), CS-616 type (Campbell Scientific Inc., USA) were used, installed in the soil profile at a depth of 20 cm, in the center of each treatment, horizontally, obtaining an average of the soil moisture at this depth, with an accuracy of ±0.01 m 3 m -3 (CAMPBELL SCIENTIFIC, 2015). The probes were previously calibrated and measured in the laboratory, and the soil moisture values obtained by the TDR probes were adjusted by the equation proposed by Vasconcelos et al (2018), where the quadratic equation best fits the data relating soil temperature with soil moisture. Soil moisture data were expressed in volumetric moisture (m 3 m -3 ).…”

Section: Soil Temperature and Moisture Sensorsmentioning

confidence: 99%

Crotalaria Sowing Times Intercropped with Off-Season Maize in the Variability of Soil Temperature and Moisture

Daniel

Dallacort

Barbieri

et al. 2022

JAS

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The thermal regime and the dynamics of soil moisture affect crop yield. Therefore, there is a need to understand the extent to which the intercropping system modifies the variability of soil temperature and moisture conditions for optimal growth and yield of the maize crop. This study aimed to evaluate the influence of different sowing times of crotalaria in an intercropping system with irrigated and non-irrigated off-season maize in the variability of soil temperature and moisture. The experiment consisted of twelve treatments, consisting of different cropping systems (intercropping): maize in a single crop (MS); sowing of crotalaria simultaneous with maize (MCS); sowing of crotalaria with maize in the VE stage (MCVE); sowing of crotalaria with maize in stage V2 (MCV2); sowing of crotalaria with maize in stage V4 (MCV4); sowing of crotalaria with maize in stage V6 (MCV6), in irrigated and non-irrigated systems. Soil temperature was monitored at depths of 10, 20, 30 and 40 cm, and soil moisture was monitored at a depth of 20 cm using "K-type" thermocouple sensors and time domain reflectometry (TDR) probes, which were all connected to a Datalogger and programmed to store the collected data at 15-minute intervals. Irrigation was carried out with a uniformity coefficient greater than 80% and a water depth of 10.38 mm h-1 with a sprinkler system. The intercropping of maize with crotalaria provides the soil with a smaller range of soil temperature, with higher values in the system without irrigation compared to the irrigated system. Soil moisture was lower in the single maize treatment, as it increased soil water evaporation compared to the intercropping treatments. In the irrigated system, the soil moisture was higher at 0.010 m3 m-3 in relation to the system without irrigation. The irrigated system obtained better results for maize yield than the non-irrigated system.

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“…Soil moisture values obtained by TDR probes were adjusted by the equation proposed by Vasconcelos, et al [19], where the quadratic equation best fits data relating temperature to soil moisture.…”

Section: Irrigation Managementmentioning

confidence: 99%

Thermal and Soil Moisture Amplitude of Intercropped Crops

Barbieri

Freitas

Dallacort

et al. 2020

JEAI

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Conservation systems of production are promoting yields and profitability, intercropping systems aim at sustainable maximization of soil and water use, and have become an alternative for regions characterized by relatively short rainy periods and high temperatures. The objective of this work was to evaluate the influence of the intercropping system between maize (Zea mays L.) and C. juncea (Crotalaria juncea L.) on soil temperature and humidity for the municipality of Tangará da Serra in Brazil. The treatments consisted of the single crop of maize and crotalaria, as well as their intercrop cultivation, the soil temperature was evaluated at depths of 0.10, 0.20, 0.30 and 0.40 m and soil moisture at depths of 0.20 and 0.40 m. The components of grain production and yield of maize were also evaluated, for crotalaria, height, diameter and dry mass of the plants were evaluated. The highest soil temperature occurred at 14 h with an average of 21°C for all three treatments. The intercropping of maize with crotalaria gave the soil a lower amplitude of the soil temperature and kept the soil moisture high with values of 0.3 m3 m-3 in the depth of 0.20 m. The development stage presented the lowest mean thermal amplitude and higher humidity for the intercrop system. The yield of maize in an intercrop was reduced by 42.7% compared to a single crop.

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Laboratory temperature-compensating calibration procedure for soil water content determination by reflectometry

Cited by 3 publications

References 19 publications

Temperatura e umidade do solo em função do uso de cobertura morta no cultivo de milho

Temperatura e umidade do solo em função do uso de cobertura morta no cultivo de milho

Crotalaria Sowing Times Intercropped with Off-Season Maize in the Variability of Soil Temperature and Moisture

Thermal and Soil Moisture Amplitude of Intercropped Crops

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