Can almond trees directly dictate their irrigation needs?

Goldhamer, David A.; Fereres, E.; Salinas, Mario

doi:10.3733/ca.v057n04p138

Cited by 34 publications

(13 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such indicators can be very useful for irrigation scheduling (Goldhamer & Fereres, 2001;Goldhamer et al, 2003) and, under deficit irrigation conditions, the continuous control of the plant water status may be crucial for preventing a moderate, potentially beneficial, water stress from becoming too severe, which would result in a reduction of yield (Domingo et al, 1996;Johnson & Handley, 2000;Ortuño et al, 2009b).…”

mentioning

confidence: 99%

Diurnal variations in water relations of deficit irrigated lemon trees during fruit growth period

García-Orellana

Ortuño

Conejero

et al. 2013

Span. j. agric. res.

View full text Add to dashboard Cite

Field-grown lemon trees (Citrus limon (L.) Burm. fil. cv. Fino) were subjected to different drip irrigation treatments: a control treatment, irrigated daily above crop water requirements in order to obtain non-limiting soil water conditions and two deficit irrigation treatments, reducing the water applied according to the maximum daily trunk shrinkage (MDS) signal intensity (actual MDS/control treatment MDS) threshold values of 1.25 (T1 treatment) and 1.35 (T2 treatment), which induced two different drought stress levels. Daily variations in leaf (Yleaf) and stem (Ystem) water potentials, leaf conductance, net photosynthesis, sap flow (SF) and trunk diameter fluctuations were studied on four occasions during the lemon fruit growth period. Ystem and Yleaf revealed a diurnal pattern in response to changes in evaporative demand of the atmosphere. Both water potentials decreased in response to water deficits, which were more pronounced in the T2 treatment. Ystem was seen to be a better plant water status indicator than Yleaf. The difference between the two values of Y (Ystem - Yleaf = DY) was closely correlated with sap flow, making it a suitable measure of leaf transpiration. Using the slope of this relationship, the canopy hydraulic conductance (KC) was estimated. When other continuously recorded plant-based indicators are not accessible, the concurrent measurement of leaf and stem water potentials at midday, which are relatively inexpensive to measure and user-friendly, act as sufficiently good indicators of the plant water status in field grown Fino lemon trees.

show abstract

mentioning

confidence: 99%

Diurnal variations in water relations of deficit irrigated lemon trees during fruit growth period

García-Orellana

Ortuño

Conejero

et al. 2013

Span. j. agric. res.

View full text Add to dashboard Cite

show abstract

“…Since the plant water status controls many physiological processes and crop productivity, this information can be highly useful in irrigation scheduling (Goldhamer and Fereres, 2001;Goldhamer et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Comparison of continuously recorded plant-based water stress indicators for young lemon trees

et al. 2004

View full text Add to dashboard Cite

Continuously recorded plant-based water stress indicators (sap flow and parameters derived from trunk diameter fluctuations) were compared in potted young lemon trees (Citrus limon (L.) Burm. fil, cv. Verna) grafted on sour orange (C. aurantium L.) rootstock submitted to deficit irrigation. Daily maximum (MXTD) and minimum (MNTD) trunk diameters and daily trunk diameter shrinkage (MDS) were directly influenced by the water supply to the trees from the soil. The continuously recorded plant-based water stress indicators presented different degrees of sensitivity when used to estimate the water status of the plants. Sap flow (SF) and MDS were more immediate and sensitive than MXTD and MNTD. However, the higher signal intensity: noise for SF and the fact that its signal intensities remained clearly above unity during the stress period, indicating that the soil water was depleted, point to the greater reliability of this indicator. Also, the possibility of developing further baseline relationships between SF and air vapour pressure deficit in fully irrigated trees in field conditions increases the feasibility of using this parameter in automatic irrigation systems.Abbreviations: V -volumetric soil water content; md -midday leaf water potential; pd -predawn leaf water potential; p -leaf turgor potential; g l -leaf conductance; MDS -maximum daily trunk shrinkage; MNTDminimum daily trunk diameter; MXTD -maximum daily trunk diameter; P n -net photosynthesis; SF -sap flow; TDF -trunk diameter fluctuations; VPD -air vapour pressure deficit.

show abstract

“…Irrigation can use well over half of all diverted water (Fereres et al, 2003;Goldhamer et al, 2003), and there is tremendous incentive to improve irrigation efficiency (Costa et al, 2007). Maximizing water productivity requires scheduling irrigation based on crop water status rather than on a fixed schedule (Fereres and Evans, 2006).…”

mentioning

confidence: 99%

Differences in Drought Tolerance among Gisela® Cherry Rootstocks Determined Using Automated Weighing Lysimeters

Stott¹,

Black²,

Bugbee³

2019

horts

View full text Add to dashboard Cite

The Gisela® series of dwarfing rootstock are widely used because they enable high-density production, but they may be sensitive to drought. Drought tolerance may be associated with root-zone distribution and depth or with physiological adaptation to low water potential. Here we describe a novel technique for determining physiological tolerance to drought when root distribution is held constant. In two matching studies, we continuously measured transpiration of two groups of eight trees using a 16-container automated weighing lysimeter system in a greenhouse. With this system, Gisela® 3, 5, and 12 (G.3, G.5, and G.12) rootstocks were subjected to multiple, controlled drought cycles based on reductions in whole-tree transpiration. To provide an equivalent amount of stress for each tree, water was withheld until the daily transpiration rate had decreased to less than 250 g of water transpired per tree per day. Each tree was then drip-irrigated to bring the root-zone back to about field capacity. G.3 and G.12 rootstocks more rapidly recovered to maximum transpiration rates compared with G.5 (an indication of ability to resume normal growth after a drought). At harvest, G.3 and G.12 rootstocks also had greater leaf area and trunk diameter. Both transpiration data and harvest data indicate physiological differences among rootstocks. Because root-zone volume was constant, these differences are not associated with changes in root distribution or depth. These data indicate that G.5 is less adapted for regulated deficit irrigation strategies that include long irrigation intervals.

show abstract

Can almond trees directly dictate their irrigation needs?

Cited by 34 publications

References 12 publications

Diurnal variations in water relations of deficit irrigated lemon trees during fruit growth period

Diurnal variations in water relations of deficit irrigated lemon trees during fruit growth period

Comparison of continuously recorded plant-based water stress indicators for young lemon trees

Differences in Drought Tolerance among Gisela® Cherry Rootstocks Determined Using Automated Weighing Lysimeters

Contact Info

Product

Resources

About