Deficit irrigation scheduling and yield prediction of ‘Kinnow’ mandarin (Citrus reticulate Blanco) in a semiarid region

Abstract Soil moisture heterogeneity in the root zone is common both during the establishment of tree seedlings and in experiments aiming to impose semi-constant soil moisture deficits, but its effects on regulating plant water use compared with homogenous soil drying are not well known in trees. Pronounced vertical soil moisture heterogeneity was imposed on black poplar (Populus nigra L.) grown in soil columns by altering irrigation frequency, to test whether plant water use, hydraulic responses, root phytohormone concentrations and root xylem sap chemical composition differed between wet (well-watered, WW), and homogeneously (infrequent deficit irrigation, IDI) and heterogeneously dry soil (frequent deficit irrigation, FDI). At the same bulk soil water content, FDI plants had greater water use than IDI plants, probably because root abscisic acid (ABA) concentration was low in the upper wetter layer of FDI plants, which maintained root xylem sap ABA concentration at basal levels in contrast with IDI. Soil drying did not increase root xylem concentration of any other hormone. Nevertheless, plant-to-plant variation in xylem jasmonic acid (JA) concentration was negatively related to leaf stomatal conductance within WW and FDI plants. However, feeding detached leaves with high (1200 nM) JA concentrations via the transpiration stream decreased transpiration only marginally. Xylem pH and sulphate concentration decreased in FDI plants compared with well-watered plants. Frequent deficit irrigation increased root accumulation of the cytokinin trans-zeatin (tZ), especially in the dry lower layer, and of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC), in the wet upper soil layer. Root hormone accumulation might explain the maintenance of high root hydraulic conductance and water use in FDI plants (similar to well-watered plants) compared with IDI plants. In irrigated tree crops, growers could vary irrigation scheduling to control water use by altering the hormone balance.

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Effects of grapevine (Vitis vinifera L.) water status on water consumption, vegetative growth and grape quality: An irrigation scheduling application to achieve regulated deficit irrigation

Agricultural Water Management ◽

10.1016/j.agwat.2010.01.025 ◽

2010 ◽

Vol 97 (7) ◽

pp. 956-964 ◽

Cited By ~ 103

Author(s):

C. Acevedo-Opazo ◽

S. Ortega-Farias ◽

S. Fuentes

Keyword(s):

Vitis Vinifera ◽

Water Consumption ◽

Vegetative Growth ◽

Deficit Irrigation ◽

Water Status ◽

Irrigation Scheduling ◽

Vitis Vinifera L ◽

Regulated Deficit Irrigation ◽

Grape Quality

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Performance Evaluation of Sesame under Regulated Deficit Irrigation Application in the Low Land of Western Gondar, Ethiopia

International Journal of Agronomy ◽

10.1155/2020/3760349 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9

Author(s):

Sisay Ambachew Mekonnen ◽

Assefa Sintayehu

Keyword(s):

Deficit Irrigation ◽

Crop Production ◽

Water Productivity ◽

Irrigation Scheduling ◽

Growth Stages ◽

Crop Water ◽

Crop Water Productivity ◽

Moisture Deficit ◽

North Western ◽

Western Ethiopia

Sesame (Sesamum indicum L.) is the leading oil seed crop produced in Ethiopia. It is the second most important agricultural commodity for export market in the country. It is well suited as an alternative crop production system, and it has low crop water requirement with moderate resistance to soil moisture deficit. The low land of North Western Ethiopia is the major sesame producer in the country, and the entire production is from rainfed. The rainfall distribution in North Western Ethiopia is significantly varied. This significant rainfall variability hampers the productivity of sesame. Irrigation agriculture has the potential to stabilize crop production and mitigate the negative impacts of variable rainfall. This study was proposed to identify critical growth stages during which sesame is most vulnerable to soil moisture deficit and to evaluate the crop water productivity of sesame under deficit irrigation. The performance of sesame to stage-wise and uniform deficit irrigation scheduling technique was tested at Gondar Agricultural Research Center (Metema Station), Northern Western Ethiopia. Eight treatments, four stage-wise deficit, two uniform deficit, one above optimal, and one optimal irrigation applications, were evaluated during the 2017 irrigation season. The experiment was designed as a randomized complete block design with three replications. Plant phenological variables, grain yield and crop water productivity, were used for performance evaluation. The result showed that deficit irrigation can be applied both throughout and at selected growth stages except the midseason stage. Imposing deficit during the midseason gave the lowest yield indicating the severe effect of water deficit during flowering and capsule initiation stages. When deficit irrigation is induced throughout, a 25% uniform deficit irrigation can give the highest crop water productivity with no or little yield reduction as compared with optimal irrigation. Implementing deficit irrigation scheduling technique will be beneficial for sesame production. Imposing 75% deficit at the initial, development, late season growth stages or 25% deficit irrigation throughout whole seasons will improve sesame crop water productivity.

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Optimizing Deficit Irrigation Scheduling Under Shallow Groundwater Conditions in Lower Reaches of Amu Darya River Basin

Water Resources Management ◽

10.1007/s11269-013-0341-0 ◽

2013 ◽

Vol 27 (8) ◽

pp. 3165-3178 ◽

Cited By ~ 27

Author(s):

Fazlullah Akhtar ◽

Bernhard Tischbein ◽

Usman Khalid Awan

Keyword(s):

River Basin ◽

Deficit Irrigation ◽

Shallow Groundwater ◽

Irrigation Scheduling ◽

Amu Darya ◽

Amu Darya River

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The value of information for the management of deficit irrigation systems

10.5194/egusphere-egu2020-19219 ◽

2020 ◽

Author(s):

Niels Schuetze ◽

Oleksandr Mialyk

Keyword(s):

Deficit Irrigation ◽

Value Of Information ◽

Irrigation Scheduling ◽

Future Climate ◽

Soil Variability ◽

Irrigated Agriculture ◽

Soil Conditions ◽

Irrigation Systems ◽

Support Tool ◽

The Impact

<p>Due to climate change, extreme weather conditions such as droughts may have an increasing impact on the water demand and the productivity of irrigated agriculture. For the adaptation to changing climate conditions, the value of information about irrigation control strategies, future climate development, and soil conditions for the operation of deficit irrigation systems is evaluated. To treat climate and soil variability within one simulation-optimization framework for irrigation scheduling, we formulated a probabilistic framework that is based on Monte Carlo simulations. The framework can support decisions when full, deficit, and supplemental irrigation strategies are applied. For the analysis, the Deficit Irrigation Toolbox (DIT) is applied for locations in arid and semi-arid climates. It allows the analysis of the impact of information on (i) different scheduling methods (ii) different crop models, (iii) climate variability using recent and future climate scenarios, and (iv) soil variability. The provided results can serve as an easy-to-use support tool for decisions about the value of climate and soil data and/or a cost-benefit analysis of farm irrigation modernization on a local scale.</p>

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Optimized Regulated Deficit Irrigation Management for Watermelon Cultivation in a Semiarid Region

Journal of Agricultural Studies ◽

10.5296/jas.v9i2.18088 ◽

2021 ◽

Vol 9 (2) ◽

pp. 113

Author(s):

Kelly Nascimento Leite ◽

Daniel Fonseca de Carvalho ◽

Jose Maria Tarjuelo Martin- Benito ◽

Geocleber Gomes de Sousa ◽

Alfonso Dominguez Padilla

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Water Scarcity ◽

Deficit Irrigation ◽

Irrigation Management ◽

Control Treatment ◽

Water Volume ◽

Semiarid Region ◽

Regulated Deficit Irrigation ◽

Use Efficiency

The present study aimed to validate the MOPECO crop simulation model and to determine a viable irrigation management for watermelon in the semiarid region of Northeast Brazil, using methodologies of optimized regulated deficit irrigation (ORDI) and constant deficit irrigation (CDI). The experiment was carried out during October to December 2013 and the second one from July to August 2014 in plots of land of producers in the Baixo Acaraú Irrigated Perimeter – Ceará, Brazil. Treatments were characterized by ORDI management (70, 80, 90% ETa/ETm ratio) and CDI management along the entire cycle (70, 80 and 90% ETm) and control treatment, irrigated with 100% of the water requirement of the crop (ETm). In terms of saving of water resources, the results showed that management with regulated deficit irrigation leads to favorable and economically viable results for the farmer, of water saving, especially in a situation of severe water scarcity, irrigation management with regulated water deficit (ORDI) can provide favorable and economically viable results for the farmer. The highest value of WUE (41.8 kg m-3) was obtained with the treatment of lowest water volume applied (352.1 L) in the second experiment, decreasing with the increase in the water volume used. The ORDI methodology represents a better water use efficiency for all treatments of deficit applied compared to CDI treatments. The difference of ORDI and CDI methodology provided an increase of up to 200% in the gross margin obtained with the exploration of the watermelon culture which represents a range of R$ 986.00 in profit in a situation of water scarcity, as in the case of the studied region, the strategy with water supply of 70% of ETa/ETm ratio regulated by phenological stage was recommended in order to obtain highest water use efficiency.

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