Juan Gabriel Pérez-Pérez

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• PhD Agronomist Engineer
• Principal Researcher at Instituto Valenciano de Investigaciones Agrarias

Efficient water management is critical for sustainable agriculture in Mediterranean climates, particularly in super-high-density (SHD) olive orchards where water scarcity poses significant challenges. This study assessed the potential of UAV-based thermal and multispectral imagery to monitor crop water status and predict yield under different regul...

The aim of this study is to construct and validate an expert system to predict the adaptation of irrigation technologies, water-saving strategies, and monitoring tools by small-scale farmers in Egypt. The research investigates the impact of economic, educational, environmental, and social factors on adaptation rates. To build the expert system, ext...

In the Mediterranean area, agriculture is subject to numerous demands caused by the interplay of climate change, population growth, changing food production patterns and the increasing need for nature conservation measures, enforcing an efficient usage of resources and the creation of resilient production systems. To ensure a more sustainable water...

Irrigated croplands are especially productive but increasing costs of irrigation infrastructure, and political pressures on abstraction, requires enhanced irrigation efficiency. Farmers may be risk-averse to growing with less irrigation, requiring that the irrigation science community develop techniques to maintain or boost productivity while conse...

En las principales zonas citrícolas, donde predomina el clima semiárido, la disponibilidad de agua para el riego representa el principal factor limitante de la producción y rentabilidad del cultivo. En este contexto, el agua marina desalada (AMD) se posiciona como un recurso hídrico estratégico que puede contribuir a la sostenibilidad de la agricul...

El sector dispone de una amplia gama de dispositivos para la programación del riego, pero la interpretación de la información puede ser una tarea compleja. El éxito de las nuevas tecnologías reside en el desarrollo de programadores con capacidad de interpretación automatizada de la información. El objetivo de este trabajo ha sido evaluar el uso de...

La Región de Murcia es la principal productora de limón de España. Sin embargo, la climatología en esta región es semiárida, y bajo estas condiciones, la viabilidad de las explotaciones agrícolas depende principalmente de la disponibilidad y manejo agronómico de los recursos hídricos. En la actualidad, los agricultores complementan parte de los rec...

We aim to develop and transfer to the wine sector a decision support system (DSS) in the frame of WANEGRAPE4.0 project that, integrated into a geographic information system, helps wine growers in i) selecting the most suitable rootstock given some agroecological conditions and oenological objectives; and ii) managing irrigation and nitrogen fertili...

Grapefruit are well-adapted to arid and warm climatic conditions, but well-irrigated trees usually produce better-quality fruits. Because water is a major component of the fruits, there is a strong relationship between drought stress and fruits quality traits such as fruits size, external fruits color, and juice quality. The object of this study wa...

The physiological and agronomic responses of two irrigation systems were compared in ‘Fino 49′ lemon trees (Citrus limon [L.] Burm. fil.). The irrigation systems consisted of different designs of the irrigation installation (same amount of water and irrigation frequency): a conventional design (2L, two drip lines with six drippers per tree), and a...

[This corrects the article DOI: 10.3389/fpls.2022.866053.].

The use of more salt stress-tolerant vine rootstocks can be a sustainable strategy for adapting traditional grapevine cultivars to future conditions. However, how the new M1 and M4 rootstocks perform against salinity compared to conventional ones, such as the 1103-Paulsen, had not been previously assessed under real field conditions. Therefore, a f...

The cultivation of super-high-density (SHD) olive orchards in the Mediterranean Basin usually faces drought events due especially to low precipitation, high temperature and solar radiation in summer. Hence regulated deficit irrigation (RDI) strategies can be a useful tool for irrigation management to limit yield loss. Therefore, this work aimed to...

Para realizar una programación del riego más ajustada a la demanda hídrica, se puede estimar la evapotranspiración potencial (ETo), tal como describe el método FAO 56, con anterioridad al riego mediante predicciones meteorológicas (PM). En este trabajo se han utilizado PM del Global Forecast System (GFS) y Météo-France. Del Sistema de Información A...

Non-Contact Resonant Ultrasound Spectroscopy (NC-RUS) has emerged as a powerful tool to determine plant water status in a non-destructive, non-invasive and rapid way. In this study, ultrasonic parameters directly obtained from experimental measurements in the field using NC-RUS - such as resonant frequency (fres), velocity (v) and Q-factor - were e...

[This corrects the article DOI: 10.1371/journal.pone.0229023.].

In this study, hybrid pepper rootstock NIBER® is tested for its ability to overcome water stress situations under soil conditions. The impact of deficit irrigation (DI) on yield and fruit quality, irrigation water use efficiency is evaluated, and consequently, the agronomic impact of employing water-stress tolerant rootstock is compared to ungrafte...

Saline stress is one of most important problems that agriculture must face in the context of climate change. In the Mediterranean basin, one of the regions most affected, persimmon production can be compromised by this effect, due to the limited availability of salt tolerant rootstocks. Seedlings coming from four populations from the Diospyros genu...

The accurate estimation of plant water needs is the first step for achieving high crop water productivity. The main objective of the work was to develop an irrigation scheduling procedure for mandarin orchards under Mediterranean conditions based on replacing the amount of consumed water using reference values of soil moisture according to differen...

Boron (B), an essential nutrient for plants, participates in many physiological processes, with emphasis its role in the formation of the plant’s cell wall. In soil, the range between deficiency and toxicity of B is very narrow as compared to other nutrients, which makes its management in agriculture very difficult, as it depends on the soil and en...

Soil drying increases endogenous ABA and ACC concentrations in planta, but how these compounds interact to regulate stomatal responses to soil drying and re-watering is still unclear. To determine the temporal dynamics and physiological significance of root, xylem and leaf ABA and ACC concentrations in response to deficit irrigation (DI) or partial...

Persimmon (Diospyros kaki Thunb.) production is facing important problems related to climate change in the Mediterranean areas. One of them is soil salinization caused by the decrease and change of the rainfall distribution. In this context, there is a need to develop cultivars adapted to the increasingly challenging soil conditions. In this study,...

Water deficit and increasing pressure on water resources in semi-arid regions has led to the spread of irrigation with non-conventional water resources, such as desalinated seawater (DSW). The few existent studies to date, mainly carried out in Israel and Spain, have shown that suitable management of irrigation with DSW must be performed to avoid a...

Drought is now recognized as the abiotic stress that causes most problems in agriculture, mainly due to the strong water demand from intensive culture and the effects of climate change, especially in arid/semi-arid areas. When plants suffer from water deficit (WD), a plethora of negative physiological alterations such as cell turgor loss, reduction...

The response to a regulated deficit irrigation (RDI) strategy was evaluated in trees of ‘Verna’ lemon grafted on two rootstocks with different vigour. The experiment was carried out during three consecutive years in the IMIDA experimental orchard located in Torre Pacheco (Murcia, Spain), using 8-year-old trees of ‘Verna 51’ lemon grafted on Citrus...

Scarcity of fresh water is one of main factors that limit food crop production worldwide. However, this situation will become much more problematic in the future mainly due to three factors: (i) population increase; it is estimated that the world's population will reach 8 billion people in 2020, (ii) reduction of rainfall as a consequence of global...

The physiological and agronomic responses to two irrigation strategies-regulated saline irrigation (RSI) and regulated deficit irrigation (RDI), intended to confront water restriction-were compared in 15-year-old 'Fino 49' lemon trees (Citrus limon (L.) Burm. fil.) grafted on Citrus macrophylla Wester. Three independent treatments were applied: Con...

Sufficient nutrient application is one of the most important factors in producing quality citrus fruits. One of the main guides in planning citrus fertilizer programs is by directly monitoring the plant nutrient content. However, this requires analysis of a large number of leaf samples using expensive and time-consuming chemical techniques. Over th...

The aim of this experiment was to evaluate the effects of saline water irrigation in two citrus species, ‘Clemenules’ mandarin (CLM) and ‘Star Ruby’ grapefruit (SR), both grafted on ‘Cleopatra’ mandarin (a rootstock considered as a Cl− excluder, but a Na+ non-excluder). The experiment was carried out over 3 years (2008–2010) in the IMIDA experiment...

Previous studies with partial rootzone drying (PRD) irrigation demonstrated that alternating the wet and dry parts of the rootzone (PRD-Alternated) increased leaf xylem ABA concentration ([X-ABA]leaf) compared with maintaining the same wet and dry parts of the rootzone (PRD-Fixed). To determine the relative contributions of different parts of the r...

Soil drying and re-wetting (DRW) occurs at varying frequencies and intensities during crop production, and is deliberately used in water-saving irrigation techniques that aim to enhance crop water use efficiency. Soil drying not only limits root water uptake which can (but not always) perturb shoot water status, but also alters root synthesis of ph...

While the molecular response of model plants to salt stress in the short-medium term (hours-days) has been broadly studied, the knowledge about the nature of genes involved in maintaining homeostatic conditions in the long term (months-years) in woody perennial trees has not been addressed yet. We have analyzed physiological parameters and the tran...

Regulated deficit irrigation (RDI) and partial root zone irrigation (PRI) were compared for 4 years at two irrigation volumes (110 mm year(-1) (1) and 78 mm year(-1) (2)) in field-grown grafted Monastrell grapevines (Vitis vitifera L.) to distinguish the effects of deficit irrigation from specific PRI effects. PRI-1 and RDI-1 vines received similar...

Grapefruit (Citrus paradisi Macf.) has increased in importance as a crop species in the south-east of Spain in recent years. In spite of the fact that grapefruit is well adapted to semi-arid conditions, the irrigation necessities for fresh fruit production continue to be very high. The scarcity of water resources forces citrus growers to optimise t...

Recopilacin de resultados de los siguientes proyectos SUDOE (SO2/2.1/F28).Réseau d’actions concertées en horticulture pour une conduite de l’irrigation précise et économique en eau en SUDOE y (SOE1/P2/ E082) USO DE LA TELEDETECCIÓN PARA LA RECOMENDACIÓN Y SEGUIMIENTO DE LAS PRÁCTICAS DE RIEGO EN EL ESPACIO SUDOE- Telerieg. Los autores desean agrade...

To determine whether irrigation strategy altered the sensitivity of Citrus leaf gas exchange to soil, plant and atmospheric variables, mature (16-year-old) Fino 49 lemon trees (Citrus limon (L.) Burm. fil. grafted on Citrus macrophylla Wester) were exposed to three irrigation treatments: control (irrigated with 100% of crop potential evapotranspira...

Soil drying stimulates root production of chemical signals such as ABA, which are transferred via the xylem to the shoots to restrict water use and limit vegetative growth. Partial rootzone drying (PRD) is a deficit irrigation (DI) technique that aims to exploit this root-To-shoot signalling by alternately irrigating only one side of the crop row a...

The production of mandarins is important in the Mediterranean area, where the continued use of saline water reduces fruit yield and modifies fruit quality. Grafted trees of Clemenules mandarin scion on Carrizo citrange and Cleopatra mandarin rootstocks, two of the most common citrus rootstocks employed in this area, were irrigated with two saline t...

'Clemenules' mandarin citrus trees, grafted on Cleopatra and Carrizo rootstocks, were subjected to three irrigation treatments: the control (100% ETc), and phases II and III treatments (non-irrigation during phases II and III, respectively). The two deficit irrigation (DI) treatments affected in different ways some fruit quality parameters and thes...

During a three-year period, we evaluated the profitability of a deficit-irrigation (DI) treatment in mature `Lane late' navel orange (Citrus sinensis (L.) Osb.) trees grafted on two different drought-tolerant rootstocks, `Cleopatra' mandarin (Citrus reshni Hort. ex Tanaka) and `Carrizo' citrange (C. sinensis (L.) Osb. x Poncirus trifoliata L. Raf.)...

This work is part of the ongoing research being carried out in IMIDA experimental plots for the improvement of irrigation methods used in agriculture in the region of Murcia, contributing significantly to better drought management. Research focused on the correlation of physical variables collected in a plot of citrus trees with data of high-resolu...

Drought and salinity are two of the most important factors limiting the lemon yield in south-eastern Spain. The effects of drought and salt stress, applied independently, on water relations, osmotic adjustment and gas exchange in the highest evapotranspiration period were studied to compare the tolerance and adaptive mechanisms of 13-year-old ‘Fino...

The aim of this work was to apply one strategy of deficit irrigation (DI) to improve the final fruit quality in 10-year-old 'Lane late' sweet orange grafted on Carrizo citrange (Citrus sinensis L. Osb.xPoncirus trifoliata L.). The experiment was carried out over 2 years in an experimental orchard located in Torre Pacheco (Murcia, south-east Spain)....

This work is part of the ongoing research being carried out in IMIDA experimental plots for the improvement of irrigation methods used in agriculture in the region of Murcia, contributing significantly to better drought management. Research focused on the correlation of physical variables collected in a plot of citrus trees with data of high-resolu...

We evaluated the effects of a deficit-irrigation (DI) strategy in mature ‘Lane late’ sweet orange (Citrus sinensis (L.) Osb.) trees grafted on two different drought-tolerant rootstocks, ‘Cleopatra’ mandarin (Citrus reshni Hort. ex Tanaka) and ‘Carrizo’ citrange (Citrus sinensis (L.) Osbeck x Poncirus trifoliata L.). Two treatments were applied: a c...

The influence of a deficit-irrigation (DI) strategy on soil–plant water relations and gas exchange activity was analysed during a 3-year period in mature ‘Lane late’ (Citrus sinensis (L.) Osb.) citrus trees grafted on two different rootstocks, ‘Cleopatra’ mandarin (Citrus reshni Hort. ex Tanaka ) and ‘Carrizo’ citrange (C. sinensis L., Osbeck×Ponci...

The influence of a deficit-irrigation (DI) strategy on soil–plant water relations and gas exchange activity was analysed during a 3-year period in mature ‘Lane late’ (Citrus sinensis (L.) Osb.) citrus trees grafted on two different rootstocks, ‘Cleopatra’ mandarin (Citrus reshni Hort. ex Tanaka ) and ‘Carrizo’ citrange (C. sinensis L., Osbeck × Pon...

Since salinity and drought stress can occur together, an assessment was made of their interacting effects on leaf water relations, osmotic adjustment and net gas exchange in seedlings of the relatively chloride-sensitive Carrizo citrange, Citrus sinensis x Poncirus trifoliata. Plants were fertilized with nutrient solution with or without additional...

Leaf water relations, net gas exchange and leaf and root constituent responses to 9 days of drought stress (DS) or soil flooding were studied in 6-month-old seedlings of Carrizo citrange [Citrus sinensis (L.) Osb. ×Poncirus trifoliata L.; Carr] and Cleopatra mandarin (Citrus resnhi Hort. ex Tanaka; Cleo) growing in containers of native sand in the...

Differences between rootstocks, 'Cleopatra' mandarin and 'Carrizo' citrange, in soil-plant water relations and the influence of these factors on vigor, crop yield, fruit quality and mineral nutrition were evaluated in field-grown Clemenules mandarin trees irrigated at 100% of potential seasonal evaporation (ET(c)) (control treatment), or irrigated...

We studied the effects of the rootstocks, Cleopatra mandarin and Carrizo citrange and of saline irrigation water (3, 15 and 30 mM NaCl) on yield, growth, fruit quality and leaf mineral composition of ‘Clemenules’ mandarin citrus trees. At the end of the experiment, ‘Clemenules’ trees grafted on Carrizo had higher yield efficiency (cumulative yield...

Six clonal selections of the autochthonous Spanish lemon tress cv. Fino, named Fino 46, Fino 47, Fino 48, Fino 49 and Fino 77, and two foreign varieties Eureka and Lisbon (Citrus limon (L.) Burm. f) grafted on sour orange (C. auramtium L.) and Citrus macrophylla (C. macrophylla Wester) rootstocks were studied in Murcia (Spain). The fruit were harve...