2018 California

Evaluation of leaf carbon isotopes and functional traits in avocado reveals water-use efficient cultivars

Authors: Acosta-Rangel, A.; Ávila-Lovera, E.; De Guzman, M.; Torres, L.; Haro, R.; Arpaia, M.L.; Focht, E.; Santiago, L.

Plant water-use efficiency (WUE) describes the ratio of carbon gain to water loss during photosynthesis. It has been shown that WUE varies among crop genotypes, and crops with high WUE can increase agricultural production in the face of finite water supply. We used measures of leaf carbon isotopic composition to compare WUE among 24 cultivars of Persea americana Mill (avocado) to determine genotypic variability in WUE, identify potentially efficient cultivars, and to better understand how breeding

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2021 Israel

The impact of tree phenology on the response of irrigated avocado: The hysteretic nature of the maximum trunk daily shrinkage

Authors: Assouline, S.; Hochberg, U.; Silber, A.

The goal of this study was to check the feasibility of the use of dendrometers to monitor water stress levels in avocado trees (Persea americana Mill, cv. Hass) during the period of 2015–2017. This water stress was generated naturally during events of high vapor pressure deficit (VPD) that normally take place during the Israeli spring (May) and late autumn (September). It was also generated artificially by considering two irrigation regimes, one providing the crop water needs estimated using lysimeter

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2013 Chile

Soil erosion, runoff and nutrient losses in an avocado (Persea americana Mill) hillside orchard under different groundcover management systems

Authors: Atucha, A.; Merwin, i.; Brown, M.; Gardiazabal, F.; Mena, F.; Adriazola, C.; Lehmann, J.

Assess the influence of different groundcover management systems on erosion and runoff processes associated with extremely steep hillside avocado (Persea americana Mill) orchards, in a Mediterranean climate with high rainfall variability. We compared several groundcover management systems at a steep hillside avocado planting in a three-year study: 1) Bare soil (BS), pre- and post-emergence herbicides; 2) Vegetation strip (VS), post-emergence herbicide applied in a 1-m wide strip on the tree row plus

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2022 California

Losing Aguacate: What If Water Costs Kill Avocado Farming in San Diego County?

Authors: Balikian, R.; Genskow, K.

San Diego County is categorized as urban, yet it was one of only three counties in the United States with over 5,000 farm operations in 2017. While continuing to expand its urban area, the county lost farmland at the rate of 3.8% every year between 2002 and 2017. By several measures, avocado production is the county's most important crop, and avocado groves account for about 30% of all crops planted there. Avocado acreage is also declining rapidly in the county, at about 3% each year. To understand

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2018 California

Environmental evaluation of high-value agricultural produce with diverse water sources: case study from Southern California

Authors: Bell, E.; Stokes-Draut, J.; Horvath, A.

Meeting agricultural demand in the face of a changing climate will be one of the major challenges of the 21st century. California is the single largest agricultural producer in the United States but is prone to extreme hydrologic events, including multi-year droughts. Ventura County is one of California's most productive growing regions but faces water shortages and deteriorating water quality. The future of California's agriculture is dependent on our ability to identify and implement alternative

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2022 Chile

Optimal irrigation management for avocado (cv. 'Hass') trees by monitoring soil water content and plant water status

Authors: Beyá-Marshall, V.; Arcos, E.; Seguel, O.; Galleguillos, M.; Kremer, C.

Irrigation scheduling based on soil water content (Ɵw) sensors requires that Ɵw be maintained within a range (management lines) that is optimal for plant growth. The lower limit or “breaking point” is determined following the soil water content dynamics on the transition of a rapid rate of depletion to a slower, under similar reference evapotranspiration. Although this criterion is practical, its implementation should be validated with plant water status measurement that contemplate weather

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