Effect of thermal summation on harvest maturity of <i>Citrus aurantifolia</i> Swingle ‘Local’

Samaradiwakara, S.D.; Champa, W.A.H.; Eeswara, J. P.

doi:10.17660/actahortic.2020.1278.8

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Table 3 presents the dates of the crop development stages and the respective cumulative growing-degree days (GDDs) for the studied seasons. The GDDs were computed from the difference between the daily mean temperature and a base temperature (T base ) of 12.8 • C, in agreement with the range of values (12-13 • C) reported in the literature [57][58][59]. The dates of the crop stages were not far from those reported in the literature for diverse areas in the Mediterranean region [34,60,61].…”

Section: Experimental Design and Treatmentssupporting

confidence: 64%

Searching for Sustainable-Irrigation Issues of Clementine Orchards in the Syrian Akkar Plain: Effects of Irrigation Method and Canopy Size on Crop Coefficients, Transpiration, and Water Use with SIMDualKc Model

Darouich

Karfoul

Ramos

et al. 2022

Water

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Citrus is one of the most valuable crops in Syria, with the largest production areas in the Tartus and Latakia provinces. Water-saving policies have been adopted to modernize the irrigation systems and increase water productivity. Following dedicated research, this study aimed to evaluate the water balance in clementine trees irrigated with diverse methods and schedules using the SIMDualKc software model. Two experiments are reported: one with 10–14 years old trees irrigated with different methods (2007−2011) and the other with the same trees but now 18−20 years old, irrigated with different schedules (2015−2019). The SIMDualKc model successfully simulated the soil water contents measured in the various field plots, with root mean square error values lower than 0.004 m3 m−3 and modeling efficiencies up to 0.83. The model-calibrated standard basal crop coefficients (Kcb) were approximately constant throughout all growing stages, assuming values of 0.54−0.55 for the mature trees having smaller height (h) and fraction of ground cover (fc), and 0.64 for older trees with larger canopies, i.e., larger h and fc. With drip irrigation, single Kc had a higher value (1.14) at the end, non-growing, and initial stages, and a lower value (0.75–0.76) during mid-season (Kc mid), because precipitation was lesser then, contributing less to soil evaporation. On the other hand, Kc values were nearly constant with micro-sprinkler and surface irrigation techniques because the ground was fully wetted. The Kcb values derived from the fraction of ground cover and height (A&P approach) were similar to those obtained from the model, thus showing that the A&P approach represents a practical alternative to estimate Kcb in the practice of irrigation management. The soil water balance further revealed a large weight of the terms corresponding to the non-beneficial water consumption and non-consumptive water use when the fraction wetted was large and the application efficiencies were low. These terms were reduced, namely, evaporation losses when drip irrigation was used. This study, thus, provides a valuable tool for improving the irrigation management, water saving, and water productivity of Syrian citrus production systems.

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Section: Experimental Design and Treatmentssupporting

confidence: 64%

Searching for Sustainable-Irrigation Issues of Clementine Orchards in the Syrian Akkar Plain: Effects of Irrigation Method and Canopy Size on Crop Coefficients, Transpiration, and Water Use with SIMDualKc Model

Darouich

Karfoul

Ramos

et al. 2022

Water

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“…The field experiment was conducted in a commercial orchard consisting of cultivar 'local', located in low country dry zone (DL1b; 30-35 °C, <1750 mm/y, 120 above meters sea level) and laboratory experiments were conducted at the Institute of Postharvest Technology (IPHT), Anuradhapura. During the peak blooming period (2016( /2017, lime fruitlets at 4-5 mm diameter were tagged with polythene strips assuming the fruit set and considered as the reference point. Succeeding days were termed as the days after fruit set (DAFS).…”

Section: Methodsmentioning

confidence: 99%

“…Succeeding days were termed as the days after fruit set (DAFS). Fruits at 119, 133, 147 and 161 DAFS were harvested to evaluate postharvest life which identified as the best maturity stages to harvest (Samaradiwakara et al, 2017). Fruits of uniform size that are free from defects and blemishes were selected from each maturity stage and stored under ambient conditions (30-34 °C, 70-75% RH) in medium size (600 x 300 x 320 mm) surface sterilized plastic crates with Bleach (NaOH).…”

Section: Methodsmentioning

confidence: 99%

Harvest maturity affects postharvest quality of lime fruits (<em>Citrus aurantifolia</em> Swingle)

Samaradiwakara

Champa²,

Eeswara

2019

Trop. Agric. Res.

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Postharvest storage of lime fruits, harvested at 119, 133, 147 and 161 days after fruit set (DAFS) was evaluated based on changes in physiological weight loss (PWL), peel lightness (L*), hue (hº), Chroma (C*) values and overall visual quality rating (VQR) along with juice pH, titratable acidity (TA) and total soluble solids (TSS) under ambient condition (30)(31)(32)(33)(34)(70)(71)(72)(73)(74)(75). The results showed that stage of maturity had significant effect on changes in PWL, VQR, L* and hº values with no significant effect on juice quality parameters during the storage. The maximum storage life of nine days was observed in fruits harvested at 133 DAFS with significantly higher VQR (3.71±0.18) and hº (116.44±2.18). Both colour and PWL % influenced the visual quality of fruits. Thus, lime fruits harvested at 133 DAFS had the longest shelf life of 9 days while stages of 119, 147 and 161 DAFS had shelf life of 6, 7 and 3 days, respectively under ambient storage. This study concludes that the most suitable time for harvesting lime fruits is 133 days after fruit set.

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Effect of thermal summation on harvest maturity of Citrus aurantifolia Swingle ‘Local’

Cited by 2 publications

References 2 publications

Searching for Sustainable-Irrigation Issues of Clementine Orchards in the Syrian Akkar Plain: Effects of Irrigation Method and Canopy Size on Crop Coefficients, Transpiration, and Water Use with SIMDualKc Model

Searching for Sustainable-Irrigation Issues of Clementine Orchards in the Syrian Akkar Plain: Effects of Irrigation Method and Canopy Size on Crop Coefficients, Transpiration, and Water Use with SIMDualKc Model

Harvest maturity affects postharvest quality of lime fruits (<em>Citrus aurantifolia</em> Swingle)

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