Article
Agronomy
Munashe Mashabatu, Zanele Ntshidi, Sebinasi Dzikiti, Nebojsa Jovanovic, Timothy Dube, Nicky J. Taylor
Summary: Inaccurate crop coefficients lead to inefficient use of water resources. This study evaluated the method of deriving crop coefficients developed by Allen and Pereira (2009) for various irrigated fruit tree crops in South Africa. The study adjusted the stoma-tal sensitivity function in the model by replacing the ratio of the leaf resistance to the standard leaf resistance with a resistance parameter specific to each crop. The derived crop coefficients were standardized and tabulated for transferability between sites, but more crop-specific information is needed to improve accuracy.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Agronomy
Koffi Djaman, Ali T. Mohammed, Komlan Koudahe
Summary: This study compared maize evapotranspiration (ETa) estimated by the two-step approach and six models, and found that eeMETRIC and SIMS models showed the most similar results to the reference evapotranspiration model (ETc(kc)). These models could be used as alternatives for estimating maize actual daily evapotranspiration in northern New Mexico.
Article
Agronomy
T. Francisco Gonzalez, Mark J. Pavek, Zachary J. Holden, Rudy Garza
Summary: This study developed crop coefficients to determine evapotranspiration and evaluated the trends of five Pacific Northwest-grown russet potato cultivars. The results showed that Alturas and Clearwater Russet had significantly higher water consumption compared to Russet Burbank, providing valuable information for potato growers in the Columbia Basin.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Agronomy
David D. Tarkalson, Bradley A. King, Dave L. Bjorneberg
Summary: This study aims to explore the relationship between maize grain yield and water use, and provide data support for deficit water management decisions in irrigated maize. The results suggest that adjustments should be made to the crop coefficients for maize in the arid Northwest U.S. Additionally, by establishing crop water production functions, the range of maize yield and water productivity under different water conditions can be understood.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Horticulture
E. B. Lulane, S. Dzikiti, T. Volschenk, E. Lotze, S. J. E. Midgley
Summary: Apple producers are using nets to address climate and pest-related challenges. This study found that under fixed nets, water use in apple orchards decreased and water saving benefits were smaller than expected.
SCIENTIA HORTICULTURAE
(2022)
Article
Environmental Sciences
Eugenie Paul-Limoges, Andrew Revill, Regine Maier, Nina Buchmann, Alexander Damm
Summary: To reduce water losses in agriculture, understanding the timing of evaporation losses and the amount of water used through crop transpiration is essential. This study estimated transpiration and evaporation using biometeorological measurements and a SPA-Crop model in a Swiss cropland. The results showed that the ratio of transpiration to evapotranspiration had similar seasonal and diurnal dynamics, and was influenced by leaf area index and climatic conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Agriculture, Multidisciplinary
Lucas Eduardo de Oliveira Aparecido, Jose Maria Villela Padua, Guilherme Botega Torsoni, Thiago Orlando Costa Barboza, Lara Eduarda Silva Viol, Jose Reinaldo da Silva Cabral de Moraes, Adao Felipe dos Santos
Summary: This study aimed to determine the agroclimatic zoning of wheat in the southeastern region of Brazil. By using historical meteorological data and the ISNA method, the study found that the regions with the highest rainfall are the south of Minas Gerais and the coast of Sao Paulo. Spring and summer have better cultivation conditions, and Minas Gerais, with an altitude of over 700 meters, has 39.4% of the area suitable for wheat cultivation.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2023)
Article
Agronomy
Frantisek Jurecka, Milan Fischer, Petr Hlavinka, Jan Balek, Daniela Semeradova, Monika Blahova, Martha C. Anderson, Christopher Hain, Zdenek Zalud, Miroslav Trnka
Summary: Indicators based on evapotranspiration (ET) were analyzed for predicting crop yields of spring barley and winter wheat in 33 districts of the Czech Republic. The study showed that these indicators have the potential for real-time yield prediction during the growing season and can be valuable for decision making at regional and district levels.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Agronomy
Mingze Yao, Manman Gao, Jingkuan Wang, Bo Li, Lizhen Mao, Mingyu Zhao, Zhanyang Xu, Hongfei Niu, Tieliang Wang, Lei Sun, Dongshuang Niu
Summary: This study accurately quantified evapotranspiration and its components for greenhouse-grown tomatoes under different irrigation conditions. A modified dual crop coefficient model was developed and validated, showing that net radiation was the dominant factor controlling the variations of transpiration and evaporation.
Article
Agronomy
Yingnan Wei, Han Ru, Xiaolan Leng, Zhijian He, Olusola O. Ayantobo, Tehseen Javed, Ning Yao
Summary: Crop models play an important role in understanding and regulating agroecosystems. However, the CERES-Wheat model has limitations under water stress conditions. This study aimed to improve the model's performance by modifying the crop coefficient based on experimental data from arid and semi-arid regions. The results showed that using the PT equation for calculating reference crop evapotranspiration and crop coefficient had the best performance in simulating biomass and grain yield under water stress conditions.
Article
Agronomy
D. Kool, W. P. Kustas, A. Ben-Gal, N. Agam
Summary: Partitioning of evapotranspiration into soil water evaporation and transpiration allows separate assessment of soil and plant water, energy, and carbon exchange. Remote sensing-based models are ideally suited to monitor ET over large areas, but ET partitioning estimates vary widely. The two-source energy balance (TSEB) model was evaluated for seasonal ET partitioning, showing improved results with adaptations to plant transpiration parameters and soil heat flux, yet inferior performance when using measured soil and vine temperatures.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Agronomy
Suat Irmak, Vasudha Sharma, Amir Haghverdi, Amit Jhala, Jose O. Payero, Matthew Drudik
Summary: This study investigated the impact of variable rate irrigation and nitrogen management strategies on maize crop coefficients (Kc) under different soil types. Results showed that Kc values are more dependent on the amount rather than the timing of the nitrogen application. Overall, the highest Kc values were observed in the pre-plant nitrogen treatment, followed by fixed rate fertigation and variable rate fertigation.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Agronomy
Tiago B. Ramos, Hanaa Darouich, Ana R. Oliveira, Mohammad Farzamian, Tomas Monteiro, Nadia Castanheira, Ana Paz, Maria C. Goncalves, Luis S. Pereira
Summary: The main objective of this study was to determine the crop coefficients (Kc) of almond, olive, citrus, and pomegranate orchards in Alentejo, southern Portugal, to support the management of local orchard systems and the preservation of soil and water resources. The study successfully estimated crop evapotranspiration by monitoring the soil water balance and applying the SIMDualKc model in nine orchards. The results showed that small variations in crop coefficients for olive and citrus were related to differences in canopy cover and tree height.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Agronomy
Mohammad Jafari, Hamidreza Kamali, Ali Keshavarz, Akbar Momeni
Summary: This study aimed to determine the water requirement of mature orange trees and highlighted that irrigating at 90% of the reference evapotranspiration rate fulfills the trees' full water requirements. The average crop evapotranspiration rate was 5.2mm/day, with the average irrigation rate being 19% higher than the actual requirement. Analysis of physiological responses revealed the crucial role of stomata in regulating transpiration and maintaining leaf turgor.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Agronomy
Ting Zhang, Qiang Zuo, Ning Ma, Jianchu Shi, Yuchuan Fan, Xun Wu, Lichun Wang, Xuzhang Xue, Alon Ben -Gal
Summary: Determining relative root-zone water depletion (RRWD) thresholds for irrigation is crucial for optimizing crop yield and water productivity with limited water supply. This study developed a numerical procedure to determine RRWD thresholds and investigated the effects of climate change on optimal crop yield and water productivity. The results showed that the mean RRWDopt could be used to formulate rational irrigation management strategies for winter wheat under changing climatic conditions in the NCP.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Food Science & Technology
Alejandro Martinez-Moreno, Eva Perez-Alvarez, Ramon Lopez-Urrea, Diego Intrigliolo, M. Reyes Gonzalez-Centeno, Pierre-Louis Teissedre, Rocio Gil-Munoz
Summary: Low water quality and increasing mineral salt concentrations are two major challenges in Mediterranean viticulture. This study found that deficit irrigation with saline water can increase the soluble solids content in grapes, but has minimal impact on the phenolic composition of grapes and wines. However, wines produced from vines irrigated with saline water received the highest scores in sensory profile analysis. Therefore, in cases of water scarcity, the use of saline water for irrigation could be considered, provided that the vineyard is planted on a salt-tolerant rootstock and the soil texture promotes leaching.
Article
Environmental Sciences
Joan M. Galve, Juan M. Sanchez, Vicente Garcia-Santos, Jose Gonzalez-Piqueras, Alfonso Calera, Julio Villodre
Summary: This study evaluates the performance of several algorithms for estimating land surface temperature (LST) from Landsat 8/TIRS under high-contrast semiarid agroecosystem conditions. A simplified single band atmospheric correction method was proposed and showed potential for LST estimation, while also setting the uncertainty for LST estimates in high-contrast semiarid agroecosystems.
Article
Environmental Studies
Igor Gomez, Enric Valor, Sergio Molina, Raquel Niclos, Vicente Caselles
Summary: Weather forecasts play an important role in people's lives and are used daily. This study investigated the confidence and communication preferences of Spanish undergraduate students studying meteorology-related subjects. The results showed that students have a well-formed opinion of weather forecasts and that forecasts tend to be less accurate for larger lead times. Most students prefer weather forecasts that incorporate some uncertainty, while a minority prefer deterministic forecasts.
WEATHER CLIMATE AND SOCIETY
(2022)
Article
Agronomy
A. Martinez-Moreno, E. P. Perez-Alvarez, D. S. Intrigliolo, J. M. Miras-Avalos, R. Lopez-Urrea, R. Gil-Munoz, V Lizama, M. J. Garcia-Esparza, M. Alvarez, I Buesa
Summary: The effects of water stress and saline irrigation on the yield and grape composition of grapevines were studied. The results showed that water stress decreased yield and vegetative growth, while saline irrigation had a minor impact on vine performance. Furthermore, the watering regime had a greater effect on yield and grape composition. Therefore, the use of saline water did not have detrimental effects on vine performance or improve grape composition in the mid-term.
IRRIGATION SCIENCE
(2023)
Article
Environmental Sciences
Vicente Garcia-Santos, Raquel Niclos, Enric Valor
Summary: This study analyzed crop evapotranspiration using remote sensing techniques and model, and compared the results with ground reference data and reanalysis data. The findings showed good agreement and acceptable uncertainties.
Article
Agronomy
Francisco Montoya, Juan M. Sanchez, Jose Gonzalez-Piqueras, Ramon Lopez-Urrea
Summary: A study was conducted to investigate the effect of two drip irrigation systems on almond crop growth. The results showed that the subsurface drip irrigation (SDI) system is a suitable strategy for irrigating almond crops, reducing water consumption and increasing irrigation water productivity.
Article
Environmental Sciences
Alejandro-Martin Simon Sanchez, Jose Gonzalez-Piqueras, Luis de la Ossa, Alfonso Calera
Summary: Land use classification (LUC) is the process of providing information on land cover and the types of human activity involved in land use. This study uses multispectral reflectance Sentinel-2 images to perform agricultural LUC, achieving high accuracy by arranging pixel information as 2D yearly fingerprints and utilizing CNN for modeling and capturing multispectral temporal patterns. This operational tool shows promising potential for monitoring crops and water use over large areas.
Article
Geochemistry & Geophysics
Enric Valor, Jesus Puchades, Raquel Niclos, Joan Miquel Galve Romero, Oriol Lacave, Patricia Puig
Summary: This study presents the adaptation of the MAGIC-Heliosat method to MTSAT-2/Imager and Himawari-8/AHI sensors, and evaluates the accuracy of GHI and DNI estimates through comparison with ground data. The results show that the accuracy of GHI and DNI estimates improved with longer time steps.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Plant Sciences
Ismael Moya, Hildo Loayza, Maria-Llanos Lopez, Juan Manuel Sanchez, Yves Goulas, Abderrahmane Ounis, Roberto Quiroz, Alfonso Calera
Summary: This study used the Ledflex fluorometer to measure the effect of water stress on chlorophyll fluorescence in a fescue field under extreme temperature and light conditions. The results showed a significant decrease in fluorescence level under water stress, which was correlated with surface temperature difference. Airflex fluorometer data obtained from an ultralight plane also supported the findings.
PHOTOSYNTHESIS RESEARCH
(2023)
Article
Agronomy
Jose M. Miras-Avalos, Victoria Gonzalez-Dugo, Ivan F. Garcia-Tejero, Ramon Lopez-Urrea, Diego S. Intrigliolo, Gregorio Egea
Summary: Almond plantations are expanding globally, particularly in Spain, with more intensive systems compared to traditional rainfed orchards. This study analyzed previous irrigation trials in Spain to derive water-production functions and evaluate deficit irrigation strategies for maximizing water productivity under scarcity conditions. The results showed a yield increase with increased water application, reaching a potential yield of 2500 kg/ha with 1000 mm irrigation. Regardless of the deficit irrigation technique used, similar responses were observed under severe water restrictions. However, a regulated deficit irrigation strategy was found to be more advantageous under moderate water stress. These findings provide useful information for sustainable irrigation protocols in almond plantations.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Agronomy
Susana Ferreira, Juan Manuel Sanchez, Jose Manuel Goncalves
Summary: Rice is an important crop worldwide, with high consumption rates. Estimating water needs for rice production is essential, and remote sensing techniques have shown effectiveness in this regard. This study derived an approach to estimate actual crop evapotranspiration in rice paddies using satellite images. The findings highlight the potential of remote sensing-assisted methods in monitoring rice growth.
Proceedings Paper
Agricultural Engineering
R. Lopez-Urrea, L. L. Simon, J. M. Sanchez, L. Martinez, F. Valentin
Summary: Irrigated almond orchards are rapidly expanding in arid and semiarid areas of the Mediterranean basin. Accurate measurement of crop evapotranspiration is crucial for proper irrigation strategies. This study used field observations and remote sensing techniques to analyze the water use and crop coefficient of young almond trees in an experimental orchard.
IX INTERNATIONAL SYMPOSIUM ON IRRIGATION OF HORTICULTURAL CROPS
(2022)
Proceedings Paper
Agricultural Engineering
A. Montoro, I. Torija, R. Lopez-Urrea
Summary: An experiment was conducted in a semi-arid area of Spain to quantify the daily transpiration of grapevines and assess the impact of various meteorological parameters on transpiration.
IX INTERNATIONAL SYMPOSIUM ON IRRIGATION OF HORTICULTURAL CROPS
(2022)
Article
Geochemistry & Geophysics
Lluis Perez-Planells, Raquel Niclos, Enric Valor, Frank-Michael Goettsche
Summary: This study investigates the feasibility of using five emissivity radiative transfer models (RTMs) for vegetation canopies in combination with a classification-based methodology to create satellite land surface temperature (LST) maps. These models can obtain accurate emissivities for partially vegetated surfaces.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Proceedings Paper
Education & Educational Research
Igor Gomez, Enric Valor, Sergio Molina, Raquel Niclos, Vicente Caselles
Summary: This study focuses on Spanish undergraduate students majoring in Meteorology and their confidence in weather forecasts as well as their understanding of uncertainty. The results of a questionnaire survey indicate that the students have a well-founded opinion and solid knowledge of weather forecasts. Furthermore, the study finds that current weather forecasts tend to be less accurate for longer lead times. These findings are consistent with previous research and can inform different teaching strategies.
8TH INTERNATIONAL CONFERENCE ON HIGHER EDUCATION ADVANCES (HEAD '22)
(2022)
