8 documents found, page 1 of 1
Development and evaluation of a principal component-based composite drought ind...
Raziei, Tayeb; Miri, Morteza; Santos, João; Zand, Mehran; Pereira, Luis S.This study introduces a composite drought index (CDI) that integrates multiple drought indices, including the Simplified Standardized Precipitation Index (SSPI), Simplified Standardized Precipitation-Evapotranspiration Index (SSPEI), soil moisture measured at depths of 0–10 cm (SM1) and 10–40 cm (SM2), Normalized Difference Vegetation Index (NDVI), and Vegetation Health Index (VHI), using principal component an...
Mulching effects on soil evaporation, crop evapotranspiration and crop coeffici...
Ramos, Tiago B.; Darouich, Hanaa; Pereira, Luis S.Mulching is a widely adopted agronomic practice, often used as a water-saving strategy due to its effectiveness in reduc- ing soil evaporation. However, effects vary depending on the materials used and the extent of mulch soil coverage. Consequently, the impacts of mulching may differ considerably across production systems, preventing the establishment of reliable guidelines for irrigation water management. The...
Water requirements and crop coefficients of edible, spicy and medicinal herbs a...
Pereira, Luis S.; Mota, Mariana; Raziei, Tayeb; Paredes, PaulaTraditional edible, spicy and medicinal herbs rarely are included in studies on water requirements, evapotranspiration and crop coefficients (Kc) of vegetable crops. While the latter refer to large markets and are used worldwide, the former has small and specialized markets. They are very rarely grown in large farms but rather in small farming systems, or just harvested in the wild, and related evapotranspirati...
Single and basal crop coefficients for estimation of water use of tree and vine...
Pereira, Luis S.; Paredes, Paula; Oliveira, Cristina M.; Montoya, Francisco; López‑Urrea, Ramón; Salman, MaherThis paper reviews the research on the FAO56 single and basal crop coefficients of fruit trees and vines performed over the past twenty-five years and focus on Mediterranean and warm temperate trees and vines. Two companion papers (López-Urrea et al., (2023) Single and basal crop coefficients for estimation of water use of tree and vine woody crops with consideration of fraction of ground cover, height, and tra...
Single and basal crop coefficients for temperate climate fruit trees, vines and...
López‑Urrea, Ramón; Oliveira, Cristina M.; Montoya, Francisco; Paredes, Paula; Pereira, Luis S.The objective of the present review article was to update the standard single (K c ) and basal (K cb ) crop coefficients published in the FAO Irrigation and Drainage Paper No. 56 (FAO56), focusing on temperate climate fruit trees (pome, stone and nut fruit trees), vines and shrubs (kiwi, hop and blue- and blackberries). Standard conditions refer to crops grown in medium to large fields, having enough fetch for ...
Crop coefficients of natural wetlands and riparian vegetation to compute ecosys...
Pereira, Luis S.; Paredes, Paula; Espírito Santo, DalilaWetlands, namely the riparian ones, play a major role in landscape and water resources functionalities and provide enormous opportunities for ecosystems services. However, their area at globe scale is continuously decreasing due to appropriation by the riverain communities or by allocation of water resources to other uses, namely irrigation, in prejudice of natural wetlands. Due to the high competition for wate...
Water management dilemma in the agricultural sector of Iran: A review focusing ...
Nouri, Milad; Homaee, Mehdi; Pereira, Luis S.; Bybordi, MohammadAround 90% of fresh renewable water is being used in Iran, indicating high water stress conditions across the country. Given that agricultural irrigation accounts for the majority of water use and consumption, any efforts to alleviate water stress must focus on enhancing agricultural water management. This paper aims to exhaustively compile the existing literature on the consequences and drivers of water insecu...
SPI modes of drought spatial and temporal variability in Portugal: comparing ob...
Raziei, Tayeb; Martins, Diogo S.; Bordi, Isabella; Santos, João F.; Portela, Maria M.; Pereira, Luis S.; Sutera, AlfonsoRegional drought modes in Portugal are identified applying the Principal Component Analysis (PCA) and Varimax rotation to the Standardized Precipitation Index (SPI) computed on various time scales using the three precipitation datasets covering the period 1950–2003: (i) The observation dataset composed of 193 rain-gauges distributed almost uniformly over the country, (ii) the PT02 high-resolution gridded datase...