Water relations of olive trees cultivated under deficit irrigation regimes

Masmoudi, Chiraz Charfi; Ayachi, Mouna; Mohamed, Gouia; Laabidi, Foued; Reguaya, Saloua Ben; Amor, Abderrazzek Oueled; Bousnina, Mohamed

doi:10.1016/j.scienta.2010.04.042

Cited by 24 publications

(10 citation statements)

References 12 publications

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“…The values of Ψ leaf reached values of −4.75 to −4.45 MPa. Such declines of leaf water potentials were observed by several authors, even in irrigated olive orchards [3,9,12,14,50]. These authors observed that seasonal dynamics of plant water status respond to the variations in tree water status, the soil moisture conditions, and the atmospheric evaporative demand.…”

Section: Discussionmentioning

confidence: 72%

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

Mezghani

Mguidiche

Khebour³

et al. 2019

Sustainability

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M.A.M.); amelmguidiche@yahoo.fr (A.M.); imen_zouaring@yahoo.fr (I.Z.)Abstract: Sustainability of olive production is possible by adopting the modern techniques of irrigation and fertilization. In Tunisia, olive trees are usually cultivated in poor soils, under semi-arid conditions characterized by water scarcity. This study investigated the effects of different water supply and fertilization on leaf water status and crop yield of three different olive oil varieties cultivated in central Tunisia, during four experimental seasons (2014)(2015)(2016)(2017). Three treatments were examined: trees conducted under rainfed conditions (TRF), which represented the control treatment, trees irrigated with 50% ET c (T50) and, finally, trees irrigated with 50% ET c and with additional fertilization (T50F). Leaf water content and potential, yield and water use efficiency have been monitored on three different varieties, Chetoui, Chemlali, and Koroneiki, which are quite typical in the considered region. For all the growing seasons, midday leaf water potentials were measured from April to September. Midday leaf water potentials (MLWP) were generally higher for the two irrigated treatments (T50 and T50F) than for non-irrigated trees (TRF). As the season proceeded, MLWPs tended to decrease during summer for all the treatments and varieties. The lowest values were observed for the non-irrigated trees, varying between −3.25 MPa to −4.75 MPa. Relative leaf water content followed the same trends of midday leaf water potentials. Chetoui showed the lowest yield, which did not exceed 1530 Kg/(ha year), even for irrigated and fertilized trees. On the other hand, the yields of Chemlali and Koroneiki, cumulated in the four years, reached the maximum value of about 20 tons/ha. For these two varieties, the cumulated yield obtained in the control treatment (TRF) resulted significantly lower than the corresponding of the other two treatments (T50 and T50F). The highest irrigation water use efficiency (WUE) was estimated for Chemlali (T50) and (TRF). WUE was equal to 1.22 Kg/m 3 for Koroneiki under fertigated treatment (T50F). Application of the only water supply (50% ET c ) or associated with fertilizer improved the tree water status and increased the productivity of Chemlali and Koroneiki varieties.

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Section: Discussionmentioning

confidence: 72%

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

Mezghani

Mguidiche

Khebour³

et al. 2019

Sustainability

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“…In many studies carried out in Tunisia [64]- [69] [52] [70] and elsewhere around the Mediterramean countries [14] [71]- [77], irrigation is applied as a compulsory practice when the tree is the most responsive to water. These works sought to evaluate the potential of using different irrigation amounts to complement rainfall.…”

Section: Crop Evapotranspiration and Methods Of Et0 Computation: Briementioning

confidence: 99%

Rainfall Distribution Functions for Irrigation Scheduling: Calculation Procedures Following Site of Olive (<i>Olea europaea</i> L.) Cultivation and Growing Periods

Masmoudi-Charfi¹,

Habaieb²

2014

AJPS

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In Tunisia (36.5˚N, 10.2˚E, Alt. 10 m), rainfall is the major factor governing olive production. It is characterized by large variability in time and space, making yields of olive trees highly dependent on the amount of water received and timing. Thus, improvement of olive productivity by irrigation is necessary. This study aimed to determine the crop water needs of olive orchards and the rainfall frequencies at which they are covered following age and sites of olive production. For this purpose, the rainfall distribution functions are established for different cities of Tunisia (Tunis, Bizerte, Béja, Nabeul, Sidi Bouzid, Gabes and Sousse). For all sites and growing periods, the reference evapotranspiration (ET0) was computed by using several formulas. Their performance against the Penman Monteith (PM) method was evaluated graphically and statistically in all considered cities in order to evaluate their accuracy for better adapting them to the existing environmental conditions, particularly when data are missing to compute ET0-PM. Results presented herein show that the estimated ET0 values strongly correlate with ET0-PM at all sites and formulas with r values up to 0.88. Particularly, the methods of Turc and Ivanov appropriately predict the ET0-PM in all climatic regions of Tunisia and may constitute an appropriate alternative for ET0 estimation when data are missing to compute ET0-PM. However, although the Turc method performs well with all climatic zones, arid and semi-arid, in western, northern and coastal areas of Tunisia, the Ivanov method appears to be more appropriate to the northern areas (Béja and Bizerte) characterized by semi arid climate and having annual rainfall of up to 450 mm, though a poorer agreement was found when using the Eagleman formula. Estimates of ET0 by using the Hargreave-Samani (HS) formula for the east-southern area (Gabes) characterised by arid climate show satisfactory agreement with ET0-PM estimates, corroborating previous findings reporting

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“…Coratina (-4 MPa) compared with -3 MPa for the other four cultivars. Masmoudi et al (2010) stated that the recommended threshold stem water potentials at midday for initiating irrigation of olives in central Spain were -1.2 MPa during 'on' years and -1.4 MPa during 'off' years. It is not clear on what evidence this assertion was based.…”

Section: Plant Water Status and Gas Exchangementioning

confidence: 99%

“…Tunisia : In southern Tunisia (34°N 10°E), Masmoudi et al . (2010) recorded midday leaf water potentials and stomatal conductances in five cultivars of six-year-old olive trees over a summer season. There were three deficit irrigation treatments (20, 50 and 100% ETc replacement, where ETc is the potential water use by olives).…”

Section: Plant Water Relationsmentioning

confidence: 99%

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THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF OLIVE (Olea europaeaL.): A REVIEW

Carr

2013

Ex. Agric.

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SUMMARYThe results of research on the water relations and irrigation needs of olive are collated and summarised in an attempt to link fundamental studies on crop physiology to irrigation practices. Background information on the ecology of the olive (it is native to the coastal areas of the eastern Mediterranean) and on crop development processes are presented, followed by reviews of the influence of water stress on gas exchange (stomatal conductance, photosynthesis and transpiration), crop water requirements, water productivities and irrigation systems. The olive has many attributes that help to protect it against drought, including the morphology of the leaf, and the capacity to conserve water under conditions of high evaporative demand through stomatal closure, osmotic regulation and resistance to cavitation. The concept of ‘deficit irrigation’ has been the subject of much research. Although vegetative growth is restricted, there is no convincing evidence that ‘sustained deficit irrigation’ or ‘regulated deficit irrigation’ or ‘partial root zone drying’ offer any advantages over conventional practices. Water productivities are very variable and difficult to reconcile due, in part, to biennial bearing, tree-to-tree variability and differences in tree population densities. Similarly, no clear consensus has emerged on how best to exploit the sensitivity of trunk expansion to water availability in irrigation scheduling. As production methods for this historical crop are intensified (high-density hedgerows, irrigated and mechanized orchards), so will the need to understand the role that water plays in the production processes become ever more critical.

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Water relations of olive trees cultivated under deficit irrigation regimes

Cited by 24 publications

References 12 publications

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

Rainfall Distribution Functions for Irrigation Scheduling: Calculation Procedures Following Site of Olive (<i>Olea europaea</i> L.) Cultivation and Growing Periods

THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF OLIVE (Olea europaeaL.): A REVIEW

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Water relations of olive trees cultivated under deficit irrigation regimes

Cited by 24 publications

References 12 publications

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

Water Status and Yield Response to Deficit Irrigation and Fertilization of Three Olive Oil Cultivars under the Semi-Arid Conditions of Tunisia

Rainfall Distribution Functions for Irrigation Scheduling: Calculation Procedures Following Site of Olive (&lt;i&gt;Olea europaea&lt;/i&gt; L.) Cultivation and Growing Periods

THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF OLIVE (Olea europaeaL.): A REVIEW

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Rainfall Distribution Functions for Irrigation Scheduling: Calculation Procedures Following Site of Olive (<i>Olea europaea</i> L.) Cultivation and Growing Periods