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Actual and standard crop coefficients for semi‑natural and planted grasslands a...
Pereira, Luís Santos; Paredes, Paula; Espírito-Santo, Dalila; Salman, MaherNatural and planted grasslands play a very important role in agriculture as source of various ecosystem services, including carbon sequestration and biodiversity, and are responsible for a large fraction of agricultural water use in rainfed and irrigated fields. It is, therefore, relevant to precisely know their water use and vegetation requirements with consideration of relevant climate, from extremely cold, d...
Impacts of a shallow saline water table on maize evapotranspiration and groundw...
Liu, Meihan; Paredes, Paula; Shi, Haibin; Ramos, Tiago B.; Dou, Xu; Dai, Liping; Pereira, Luís SantosThe occurrence of shallow saline water tables in arid zones provides for groundwater-fed natural vegetation and for a substantial amount of irrigated crops’ water needs. This is the case of the Hetao plain, upper Yellow River Basin, Inner Mongolia, China, where one of the major irrigation systems of China and the World is installed. As reviewed, numerous irrigation and water management studies have been develop...
Estimating and partitioning maize evapotranspiration as affected by salinity us...
Liu, Meihan; Shi, Haibin; Paredes, Paula; Ramos, Tiago B.; Dai, Liping; Feng, Zhuangzhuang; Pereira, Luís SantosWater scarcity and saline stress are primary threats for water use and agricultural production in arid and semi- arid regions, such as the Hetao Irrigation District, China. The current study, using irrigation with saline water, developed through three seasons (2017–2019) of field experimental surveillance of mulched maize water use in two cropped weighing lysimeters. Measurements included crop characteristics (...
Water use and soil water balance of Mediterranean vineyards under rainfed and d...
Darouich, Hanaa; Ramos, Tiago B.; Pereira, Luís Santos; Rabino, Danilo; Bagagiolo, Giorgia; Capello, Giorgio; Simionesei, Lucian; Cavallo, EugenioVineyards represent complex Mediterranean agrosystems that deliver significant ecosystem services to society. Yet, many vine-growers still need to assimilate the importance of crop and soil management to the conservation of soil and water resources. The main objective of this study was to evaluate water use and the water balance terms in rainfed and irrigated vineyards in Italy and Portugal, respectively, in bo...
Searching for Sustainable-Irrigation Issues of Clementine Orchards in the Syria...
Darouich, Hanaa; Karfoul, Razan; Ramos, Tiago B.; Moustafa, Ali; Pereira, Luís SantosCitrus is one of the most valuable crops in Syria, with the largest production areas in the Tartus and Latakia provinces. Water-saving policies have been adopted to modernize the irrigation systems and increase water productivity. Following dedicated research, this study aimed to evaluate the water balance in clementine trees irrigated with diverse methods and schedules using the SIMDualKc software model. Two e...
Efeitos da rega e do regime hídrico em olival super intensivo no Alentejo
Santos, Francisco Lúcio; Correia, Maria Manuela; Coelho, Renato Ruas; Sousa, Adélia; Paço, Teresa Afonso do; Pereira, Luís SantosO presente estudo caracteriza os efeitos de uma condução típica de rega em olival superintensivo (1,35 x 3,75 m) na região de Évora (Alentejo) e em solo Cambissolo Êutrico. Analisa-se o regime hídrico praticado em dois tratamentos de rega, normal (FI) e deficitário (DI), este com redução da dotação de rega depois do endurecimento do caroço e seus efeitos sobre a transpiração, a humidade do solo e o potencial hí...
Crop coefficients and transpiration of a super intensive Arbequina olive orchar...
Paço, Teresa Afonso do; Paredes, Paula; Pereira, Luís Santos; Silvestre, José; Santos, Francisco L.The SIMDualKc model was used to simulate crop water requirements for a super high density olive orchard in the region of Alentejo, Portugal. This model uses the dual crop coefficient approach to estimate and partitioning the actual crop evapotranspiration (ETc act) and therefore to perform the soil water balance. The model was calibrated with 2011 tree transpiration using trunk sap flow measurements and was val...
Propriedades hidráulicas do solo para as diferentes classes texturais
Ramos, Tiago; Gonçalves, Maria Conceição; Martins, José Casimiro; Pires, Fernando; Pereira, Luís SantosAs propriedades hidráulicas apresentam uma grande variabilidade espacial devido à heterogeneidade do solo, sendo a textura um dos factores determinantes dessa heterogeneidade. Neste trabalho estudou-se a variabilidade da curva de retenção de água, θ(h), e da curva da condutividade hidráulica, K(h), determinadas em solos de texturas diferentes e correspondentes a 11 das 12 classes texturais do diagrama triangula...
Efeitos da rega e do regime hídrico em olival super intensivo no Alentejo
Santos, Francisco Lúcio; Correia, Maria Manuela; Coelho, Renato; Sousa, Adélia; Paço, Teresa; Pereira, Luís SantosO presente estudo caracteriza os efeitos de uma condução típica de rega em olival super-intensivo (1,35 x 3,75 m) na região de Évora (Alentejo) e em solo Cambissolo Êutrico (WRB, 1998). Analisa-se o regime hídrico praticado em dois tratamentos de rega, normal (FI) e deficitário (DI), este com redução da dotação de rega depois do endurecimento do caroço e seus efeitos sobre a transpiração, a humidade do solo e o...
Multi-band remote sensing based retrieval model and 3D analysis of water depth ...
Li, Changyou; Sun, Biao; Jia, Keli; Zhang, Sheng; Li, Weiping; Shi, Xiaohong; Cordovil, Cláudia; Pereira, Luís SantosHulun Lake, a large lake located on the cold and arid Hulunbeir grassland in the Inner Mongolia Autonomous Region, is the fifth largest in China and the largest in the north of the country. However, the information on the lake’s characteristics (e.g., water depth versus surface area) is scarce in literature. Based on the lake’s physiographic features, this study developed and used a model that merges the sunlig...