Stem water potential-based regulated deficit irrigation scheduling for olive table trees

2020 ◽  
Vol 242 ◽  
pp. 106418
Author(s):  
M. Corell ◽  
M.J. Martín-Palomo ◽  
I. Girón ◽  
L. Andreu ◽  
A. Galindo ◽  
...  
Keyword(s):  
Water Potential ◽  
Deficit Irrigation ◽  
Irrigation Scheduling ◽  
Stem Water Potential ◽  
Regulated Deficit Irrigation ◽  
Stem Water

scholarly journals Regulated deficit irrigation and tommy atkins mango orchard productivity under microsprinkling in brazilian semi arid

2011 ◽  
Vol 31 (6) ◽  
pp. 1052-1063 ◽  
Author(s):  
Carlos E Cotrim ◽  
Maurício A Coelho Filho ◽  
Eugênio F Coelho ◽  
Márcio M Ramos ◽  
Paulo R Cecon
Keyword(s):  
Water Potential ◽  
Deficit Irrigation ◽  
Soil Water Potential ◽  
Field Capacity ◽  
Stem Water Potential ◽  
Regulated Deficit Irrigation ◽  
Mango Tree ◽  
Arid Conditions ◽  
Stem Water ◽  
Semi Arid

This study aimed to test controlled levels of water deficiency in soil in mango trees, under microsprinkling irrigation, in semi-arid conditions, and to evaluate its effect in the productivity and fruits quality. The deficits were applied in the phases I, II and III of growth of the fruit, during the productive cycles of the mango tree in 2006 and 2007. The experiment in both cases was arranged in an entirely random design with 10 treatments and 3 repetitions, in the year I, and with 8 treatments and 3 repetitions in the year II. The values of soil water potential, of the treatments submitted to regulated deficit irrigation (RDI), were placed in the range of 0 to -0.011 MPa, showing that the soil humidity varied between the saturation and the field capacity, not characterizing deficit water condition. The average values of stem water potential (Ψstem) varied between -0.90 and -1.74 MPa, evidencing significant effect (p <0.05) just for T1 (without irrigation), T7 and T8 (RDI with 30% of the ETc in the phases II and III, respectively). Through the variance analysis, significant differences were not verified among productivity, number of fruits per plant and size of the fruit, in none of the experiments, what indicates the possibility of reduction of the water use in the irrigation of the mango tree without significant losses of productivity and fruit quality.

Partial rootzone drying improves almond tree leaf-level water use efficiency and afternoon water status compared with regulated deficit irrigation

2011 ◽  
Vol 38 (5) ◽  
pp. 372 ◽  
Author(s):  
Gregorio Egea ◽  
Ian C. Dodd ◽  
María M. González-Real ◽  
Rafael Domingo ◽  
Alain Baille
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Stem Water Potential ◽  
Regulated Deficit Irrigation ◽  
Leaf Level ◽  
Use Efficiency ◽  
Stem Water ◽  
Partial Rootzone Drying

To determine whether partial rootzone drying (PRD) optimised leaf gas exchange and soil–plant water relations in almond (Prunus dulcis (Mill.) D.A. Webb) compared with regulated deficit irrigation (RDI), a 2 year trial was conducted on field-grown trees in a semiarid climate. Five irrigation treatments were established: full irrigation (FI) where the trees were irrigated at 100% of the standard crop evapotranspiration (ETc); three PRD treatments (PRD70, PRD50 and PRD30) that applied 70, 50 and 30% ETc, respectively; and a commercially practiced RDI treatment that applied 50% ETc during the kernel-filling stage and 100% ETc during the remainder of the growth season. Measurements of volumetric soil moisture content in the soil profile (0–100 cm), predawn leaf water potential (Ψpd), midday stem water potential (Ψms), midday leaf gas exchange and trunk diameter fluctuations (TDF) were made during two growing seasons. The diurnal patterns of leaf gas exchange and stem water potential (Ψs) were appraised during the kernel-filling stage in all irrigation regimes. When tree water relations were assessed at solar noon, PRD did not show differences in either leaf gas exchange or tree water status compared with RDI. At similar average soil moisture status (adjudged by similar Ψpd), PRD50 trees had higher water status than RDI trees in the afternoon, as confirmed by Ψs and TDF. Although irrigation placement showed no effects on diurnal stomatal regulation, diurnal leaf net photosynthesis (Al) was substantially less limited in PRD50 than in RDI trees, indicating that PRD improved leaf-level water use efficiency.

Midday Stem Water Potential as a Basis for Irrigation Scheduling

2010 ◽  
Author(s):  
K A Shackel ◽  
R P Buchner ◽  
J H Connell ◽  
J P Edstrom ◽  
A E Fulton ◽  
...  
Keyword(s):  
Water Potential ◽  
Irrigation Scheduling ◽  
Stem Water Potential ◽  
Stem Water

Multispectral reflectance vegetation indices are highly sensitive to water stress in grapefruit trees

2020 ◽  
Author(s):  
Pablo Berrios ◽  
Abdelmalek Temnani ◽  
David Pérez ◽  
Ismael Gil ◽  
Susana Zapata ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Potential ◽  
Vegetation Index ◽  
Pearson Correlation ◽  
Vegetation Indices ◽  
Irrigation Scheduling ◽  
Plant Water ◽  
Citrus Paradisi ◽  
Stem Water Potential ◽  
Stem Water

&lt;p&gt;The sensitivity to water stress of different plant water indicators (PWI) at different plot scales (leaf and aerial) was evaluated during the second fruit growth stage of grapefruit (&lt;em&gt;Citrus paradisi&lt;/em&gt; cv. Star Ruby) trees growing in a commercial orchard for a sustainable irrigation scheduling. Trees were drip-irrigated and submitted to two irrigation treatments: (i) a control (CTL), irrigated at 100% of crop evapotranspiration to avoid any soil water limitations, and (ii) a non-irrigated (NI) treatment, irrigated as the control until the 104 days after full bloom (DAFB) when the irrigation was suppressed, until to reach a severe water stress level in the plants (around -2.3 MPa of stem water potential at solar midday). The plant water indicators studied were: stem water potential (SWP); leaf conductance (Lc); net photosynthesis (Pn), and several vegetation indices (VI) in the visible spectral region derived from an unmanned aerial vehicle equipped with a multispectral sensor. The measurements were made at 9, 12 and 18h (solar time) on 50 and 134 DAFB, coinciding with a fruit diameter of 20 and 70 mm, respectively. The correlation analysis between the PWI at leaf scale (SWP, Lc and Pn) and at aerial scale showed relatively poor results, with Pearson correlation coefficients (r values) around 0.6. However, SWP presented the highest r value with the normalized difference vegetation index (NVDI), green index (GI), normalized difference greenness vegetation index (NDGI) and red green ratio index (RGRI) showing the higher coefficients 0.80, 0,80, 0.85 and 0.86, respectively. In addition, a quadratic regression curve fitting was made for the SWP and aforementioned indices, obtaining values &amp;#8203;&amp;#8203;of R&lt;sup&gt;2&lt;/sup&gt; around 0.7 in all cases; the best fit corresponded to SWP = - 4.869 + 15.765 NDGI - 14.283 NDGI&lt;sup&gt;2&lt;/sup&gt; (R&lt;sup&gt;2 &lt;/sup&gt;= 0.749) to predict SWP values between -0.5 and -2.3 MPa. Results obtained show the possibility of using certain vegetation indices to be used in the detection of water stress in adult grapefruits, and thus propose a sustainable and efficient irrigation scheduling.&lt;/p&gt;&lt;p&gt;Funding:&lt;/p&gt;&lt;p&gt;-WATER4EVER is funded by the European Commission under the framework of the ERA-NET COFUND WATERWORKS 2015 Programme&lt;/p&gt;&lt;p&gt;-RIS3MUR REUSAGUA is funded by the Consejer&amp;#237;a de Empresa, Industria y Portavoc&amp;#237;a of the Murcia Region under the Feder Operational Program 2014-2020&lt;/p&gt;

Using midday stem water potential for scheduling deficit irrigation in mid–late maturing peach trees under Mediterranean conditions

2016 ◽  
Vol 34 (2) ◽  
pp. 161-173 ◽  
Author(s):  
José Manuel Mirás-Avalos ◽  
Francisco Pérez-Sarmiento ◽  
Rosalía Alcobendas ◽  
Juan José Alarcón ◽  
Oussama Mounzer ◽  
...  
Keyword(s):  
Water Potential ◽  
Deficit Irrigation ◽  
Stem Water Potential ◽  
Stem Water ◽  
Peach Trees ◽  
Mediterranean Conditions
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