Yield and Quality of Walnuts Subjected to Deficit Irrigation in Mountainous Water-Starved Environments
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View abstract on PubMed
Summary
This summary is machine-generated.Sustained deficit irrigation (SDI) strategies for walnut trees can conserve water, with the 75% irrigation level (SDI75) showing potential for water savings without significantly impacting yield or quality. Cultivar Cisco demonstrated better tolerance to water deficit compared to Chandler.
Area Of Science
- Horticulture and Agronomy
- Plant Physiology and Water Relations
Background
- Walnut (Juglans regia L.) is highly sensitive to water deficit, necessitating optimized irrigation for productivity.
- Deficit irrigation strategies are employed to conserve water, especially under drought conditions.
Purpose Of The Study
- To evaluate the impact of sustained deficit irrigation (SDI) at 33%, 50%, and 75% of crop water demand on walnut yield and kernel quality.
- To compare the performance of two walnut cultivars, Chandler and Cisco, under different irrigation levels.
- To determine water-saving potential and effects on nut production and kernel characteristics.
Main Methods
- Three sustained deficit irrigation (SDI) treatments (33%, 50%, 75% of crop water demand) and a full irrigation control (100%) were applied over three years.
- Nut yield (kg tree⁻¹) was measured for Chandler and Cisco cultivars.
- Morphological and physicochemical kernel parameters, including weight, size, color, sugars, minerals, and fatty acids, were analyzed.
Main Results
- Nut yield decreased proportionally with reduced irrigation levels; however, cv. Cisco showed greater tolerance to moderate and intermediate water deficit than cv. Chandler.
- SDI treatments influenced kernel parameters such as weight, size, color, sugar profiles, mineral content (K, Fe, Zn), and fatty acid composition (unsaturated and polyunsaturated).
- The SDI75 treatment allowed for approximately 25% water conservation (1681 m³ ha⁻¹) without significant negative impacts on yield or kernel quality in the short to medium term.
Conclusions
- Sustained deficit irrigation, particularly at 75% of crop water demand (SDI75), offers significant water savings for walnut cultivation.
- Cultivar selection (Cisco) is important for managing water deficit tolerance.
- Adjusting irrigation practices through SDI can enhance water productivity and potentially increase beneficial phytochemicals in walnuts.
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