scholarly journals Irrigation Protocols in Different Water Availability Scenarios for ‘Crimson Seedless’ Table Grapes under Mediterranean Semi-Arid Conditions

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 22
Author(s):  
Abdelmalek Temnani ◽  
María R. Conesa ◽  
Manuel Ruiz ◽  
Juan A. López ◽  
Pablo Berríos ◽  
...  
Keyword(s):  
Deficit Irrigation ◽  
Root Zone ◽  
Maximum Temperature ◽  
Stem Water Potential ◽  
Regulated Deficit Irrigation ◽  
Table Grapes ◽  
Use Efficiency ◽  
Partial Root Drying ◽  
Gaussian Regression ◽  
Sustainable Irrigation

For three consecutive years (2015–2017), two deficit irrigation (DI) strategies were used in a 12-year old vineyard (cv. ‘Crimson Seedless’) to implement a sustainable irrigation protocol according to the available water for the farmer. Four different irrigation treatments were assessed: (i) Control (CTL), irrigated to satisfy the maximum crop water requirements throughout the entire growing season; two DI treatments irrigated as CTL except during post-veraison, when the vines were irrigated at 50% CTL: (ii) Regulated Deficit Irrigation (RDI); and (iii) Partial Root Drying (PRD), alternating the wet and dry sides of the root zone, and (iv) irrigated according to the criteria followed by the farmer (FARM), and conditioned by the availability of water each season. The DI strategies resulted in a 50% increase in water use efficiency in the first two years and 81% during the third year. Weekly deficit irrigation protocols are proposed, which specify a maximum difference of 0.22 MPa of midday stem water potential with respect to well-watered vines for a range of irrigation water availabilities between 4000 and 7000 m3 ha−1. An applied water prediction model based on the Gaussian regression using day of the year and maximum temperature of the day is also proposed.

scholarly journals Physiological mechanism contributing to efficient use of water in field tomato under different irrigation

2009 ◽  
Vol 55 (No. 3) ◽  
pp. 128-133 ◽  
Author(s):  
S. Lei ◽  
Q. Yunzhou ◽  
J. Fengchao ◽  
S. Changhai ◽  
Y. Chao ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Use ◽  
Deficit Irrigation ◽  
Water Status ◽  
Physiological Mechanism ◽  
Regulated Deficit Irrigation ◽  
Normal Water ◽  
Use Efficiency ◽  
Antioxidant Enzymes Activities ◽  
Partial Root Drying

An open field experiment was conducted under furrow irrigation with 3 treatments: CK (control), PRD (partial root drying) and RDI (regulated deficit irrigation). The results showed that water potential, water content of the leaf and growth were decreased under PRD and RDI and the plants met stronger water stress under RDI than under PRD regime. The water use efficiency (WUE) based on fruit yield reached to 10.95 kg/m<SUP>3</SUP> and 15.33 kg/m<SUP>3</SUP>, i.e. 17.1% and 63.9% increase over CK under RDI and PRD, respectively. The transpiration efficiency in RDI was kept at the same level as CK, whereas it was promoted by 32.4% under PRD condition. CAT, SOD and POD activities were more active under RDI and especially under PRD than under CK. Therefore, following conclusions could be made: moderate water stress induced osmotic regulation under PRD conditions, leading to normal water status, higher antioxidant enzymes activities, the same level of biomass and lower water use, thus providing some part of mechanism to higher WUE under PRD condition.

scholarly journals IRRIGATION DEFICIT STRATEGIES ON PHYSIOLOGICAL AND PRODUCTIVE PARAMETERS OF 'TOMMY ATKINS' MANGO

2016 ◽  
Vol 29 (1) ◽  
pp. 173-182 ◽  
Author(s):  
MARCELO ROCHA DOS SANTOS ◽  
SÉRGIO LUIZ RODRIGUES DONATO ◽  
EUGÊNIO FERREIRA COELHO ◽  
PAULO ROBERTO FERNANDES COTRIM JUNIOR ◽  
IGOR NOGUEIRA DE CASTRO
Keyword(s):  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
Deficit Irrigation ◽  
Root Zone ◽  
Leaf Temperature ◽  
Maturation Stage ◽  
Regulated Deficit Irrigation ◽  
Irrigation Deficit ◽  
Use Efficiency

ABSTRACT: The objective of this work was to evaluate the gas exchange, leaf temperature, yield and water use efficiency in 'Tommy Atkins' mango under irrigation deficit strategies. The experimental design was randomized block, with seven treatments with regulated deficit irrigation (RDI) under micro-spray and five treatments with partial root-zone drying (PRD) under drip irrigation. The treatments on RDI consisted of application of 100, 75 and 50% of ETc at the stages S1 (beginning of flowering to fruit set) S2 (fruit development) and S3 (fruit physiological maturation). The treatments on PRD consisted of application of 100, 80, 60 and 40% of ETc, in the same three stages, alternating the irrigation side every 15 days. The regulated deficit irrigation causes less negative interference in gas exchange than the partial root-zone drying, and the climate factors affect the gas exchange and leaf temperature of 'Tommy Atkins' mango more than the regulated deficit irrigation. The partial root-zone drying irrigation with 60 and 40% of ETc causes a decrease in the 'Tommy Atkins' mango yield. The regulated deficit irrigation up to 50% of ETc, applied at the fruit maturation stage, maintain the yield and water use efficiency.

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