Daily forecasting of reference and strawberry crop evapotranspiration in greenhouses in a Mediterranean climate based on solar radiation estimates

Jiménez-Gavilán, Pablo; Ruiz, Natividad; Lozano, David

doi:10.1016/j.agwat.2015.06.012

Cited by 36 publications

(23 citation statements)

References 30 publications

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“…Tong et al (2009), et al use outdoor solar radiation and film transmittance to estimate H i [16,17]. In addition, some researches about indoor solar radiation estimation on other type greenhouses are also performed [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…In studies of Tong (2009), and Sethi (2009), the horizontal solar radiation outside the greenhouse (H out ) is decomposed into beam radiation (H b ) and diffuse radiation (H d ) [15,16,18]. In the study of Gavilán (2015), decomposition is not conducted [19].…”

Section: Introductionmentioning

confidence: 99%

“…In our study, the estimation of H i estimated by astronomy and geometry method is presented as H c . In the other case, H out is directly multiplied by greenhouse transmittance (τ g ) so decomposition is not needed [19]. In summary, the accuracy of these methods is related to K t , τ b , τ d, or τ g , and τ b , τ d , or τ g are always constants.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Solar Radiation for Tomato Water Requirement Calculation in Chinese-Style Solar Greenhouses Based on Least Mean Squares Filter

Zhang

et al. 2019

Sensors

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The area covered by Chinese-style solar greenhouses (CSGs) has been increasing rapidly. However, only a few pyranometers, which are fundamental for solar radiation sensing, have been installed inside CSGs. The lack of solar radiation sensing will bring negative effects in greenhouse cultivation such as over irrigation or under irrigation, and unnecessary power consumption. We aim to provide accurate and low-cost solar radiation estimation methods that are urgently needed. In this paper, a method of estimation of solar radiation inside CSGs based on a least mean squares (LMS) filter is proposed. The water required for tomato growth was also calculated based on the estimated solar radiation. Then, we compared the accuracy of this method to methods based on knowledge of astronomy and geometry for both solar radiation estimation and tomato water requirement. The results showed that the fitting function of estimation data based on the LMS filter and data collected from sensors inside the greenhouse was y = 0.7634x + 50.58, with the evaluation parameters of R2 = 0.8384, rRMSE = 23.1%, RMSE = 37.6 Wm−2, and MAE = 25.4 Wm−2. The fitting function of the water requirement calculated according to the proposed method and data collected from sensors inside the greenhouse was y = 0.8550x + 99.10 with the evaluation parameters of R2 = 0.9123, rRMSE = 8.8%, RMSE = 40.4 mL plant−1, and MAE = 31.5 mL plant−1. The results also indicate that this method is more effective. Additionally, its accuracy decreases as cloud cover increases. The performance is due to the LMS filter’s low pass characteristic that smooth the fluctuations. Furthermore, the LMS filter can be easily implemented on low cost processors. Therefore, the adoption of the proposed method is useful to improve the solar radiation sensing in CSGs with more accuracy and less expense.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation of Solar Radiation for Tomato Water Requirement Calculation in Chinese-Style Solar Greenhouses Based on Least Mean Squares Filter

Zhang

et al. 2019

Sensors

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“…El IFAPA, como organismo de I+D+F de la Junta de Andalucía, fue consciente desde hace años de que el futuro del sector fresero pasaba por una gestión sostenible y eficiente de los recursos hídricos empleados en la agricultura. Por ello, en estos últimos cinco años ha dedicado una importante cantidad de recursos humanos y económicos a la generación de conocimiento técnico que pueda ser transferido a los regantes para alcanzar una gestión eficiente del agua de riego (Gavilán et al, 2015;Lozano et al, 2016;Martínez-Ferri et al, 2015).…”

Section: -Introducciónunclassified

Un Nuevo Modelo De Gestión Del Riego Del Cultivo De La Fresa en La Provincia De Huelva

2016

XXXIV Congreso Nacional De Riegos

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1 Investigador contratado, IFAPA-Alameda del Obispo, david.lozano@juntadeandalucia.es 2 Técnico especialista, IFAPA-Alameda del Obispo, natividad.ruiz.baena@juntadeandalucia.es 3 Investigador titular, IFAPA-Alameda del Obispo, pedrod.gavilan@juntadeandalucia.es ResumenLa producción de fresas en la provincia de Huelva tiene dos características principales: la generación de riqueza, se crean unos 80.000 puestos de trabajo por campaña, y la localización en una zona ambientalmente sensible, casi el 75% del total de la producción se sitúa en los alrededores del Parque Nacional de Doñana. Para acometer el reto de la gestión sostenible de los recursos hídricos empleados en la producción de fresas, el IFAPA ha realizado trabajos de experimentación en fincas comerciales durante las campañas 2012/2013, 2013/2014 y 2014/2015. Los trabajos han abordado el cálculo de las necesidades de riego de la fresa, el análisis de la influencia del caudal de la cinta de riego, el cálculo de la duración óptima de los pulsos de riego y la generación de calendarios de riego basados en el pronóstico meteorológico. El objetivo del trabajo fue generar y transferir un modelo de gestión del riego de la fresa que integre en la programación del riego los aspectos agronómicos locales y las características estáticas y dinámicas de los sistemas de riego, incluyendo a su vez un pronóstico de las variables meteorológicas que afectan al cálculo de las necesidades de agua de la fresa. AbstractStrawberry production in the province of Huelva has two main features: the generation of wealth, 80,000 jobs per season, and the location in an environmentally sensitive area, almost 75% of total production is located around the Doñana National Park. IFAPA has carried out experimental works on commercial farms during the campaign 2012/2013, 2013/2014 and 2014/2015. The main objective was to address the challenge of sustainable management of water resources used in the production of strawberries. The works are related to calculation of strawberry water requirements, sensitive analysis of the irrigation tape flow, optimal duration of irrigation pulses and generation of irrigation schedules based on meteorological forecasts. The main aim of this study was to develop a management model that integrates into irrigation scheduling local agronomic parameters, static and dynamic characteristics of irrigation systems and a forecast of the meteorological variables that affect the calculation of strawberry water requirements.

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“…In the literature, there is no information on ETc fro m PSP under protected cultivation to calculate the water requirement of sugarcane, unlike other s pecies traditionally grown in this environment such as tomato (Qiu et al, 2014), strawberry (Gavilán et al, 2015) and gerbera (Carmassia et al, 2013). There are also no suitable lysimeters for the measurement of ETc of PSP in protected environment.…”

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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Daily forecasting of reference and strawberry crop evapotranspiration in greenhouses in a Mediterranean climate based on solar radiation estimates

Cited by 36 publications

References 30 publications

Estimation of Solar Radiation for Tomato Water Requirement Calculation in Chinese-Style Solar Greenhouses Based on Least Mean Squares Filter

Estimation of Solar Radiation for Tomato Water Requirement Calculation in Chinese-Style Solar Greenhouses Based on Least Mean Squares Filter

Un Nuevo Modelo De Gestión Del Riego Del Cultivo De La Fresa en La Provincia De Huelva

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

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