Effects of different comercial coatings on postharvest citrus fruit quality for export

A new computer vision algorithm for citrus fruit quality classification based on the size of a single tree fruits was developed in this study. The image properties of area, perimeter, and diameter for the citrus fruits were measured by pixels. In order to estimate citrus fruit size in a realistic manner, the ratios of diameter, perimeter and area in pixel values in relation to the actual size of one fruit were determined. The total of 1860 citrus fruits were grouped based on diameter, perimeter, and area in pixels. The results of the grouping of citrus fruits by diameter, perimeter and area were compared with the results of the survey research into citrus fruit size as conducted by the Jeju Citrus Commission. Comparative results reveal that the image of the citrus fruit diameter in pixels demonstrate a more accurate size than the other two pixel values, i.e. perimeter and area.

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An investigation into citrus fruit quality problems associated with nutrition in the Murrambidgee Irrigation Areas

Australian Journal of Experimental Agriculture ◽

10.1071/ea9750570 ◽

1975 ◽

Vol 15 (75) ◽

pp. 570

Author(s):

GI Moss ◽

ML Higgins

Keyword(s):

Citric Acid ◽

Fruit Quality ◽

Nitrogen Fertilizer ◽

Citrus Fruit ◽

Poncirus Trifoliata ◽

High Acid ◽

Highly Correlated ◽

High Level ◽

Phosphorus Levels

High juice acidity in Late Valencia oranges (on Poncirus trifoliata rootstock) was found to be a problem in the Murrumbidgee Irrigation Areas (M.I.A.). The problem was investigated by surveying 36 farms in 1971 and 20 farms in 1972. In 1971 about one third of farms produced fruit with citric acid levels above 1.4 per cent; in 1972 fruit from all farms were above this level. High acid levels were associated with excessive use of nitrogen fertilizer. Leaf analyses indicated that nitrogen and potassium levels were above the optimum, phosphorus levels were satisfactory in most cases. Magnesium levels were high-above 0.4 per cent in most instances associated with the high level of exchangeable Mg in the soils, and P. trifoliata rootstock tended to accumulate this element. Juice K and leaf Mg were highly correlated with juice acidity (r = 0.50** and r = 0.38*) and leaf Ca was correlated with the brixlacid ratio (r = 0.46*). Juice nitrogen was correlated with juice acidity.

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Symptomatology of Citrus mosaic sadwavirus (CiMV) in Some Citrus Cultivars and Effect of CiMV Infection on Citrus Fruit Quality

The Plant Pathology Journal ◽

10.5423/ppj.nt.07.2019.0192 ◽

2020 ◽

Vol 36 (1) ◽

pp. 106-110

Author(s):

Jae Wook Hyun ◽

Rok Yeon Hwang ◽

Cheol Woo Choi ◽

Kyung Eun Jung ◽

Seung Gab Han

Keyword(s):

Fruit Quality ◽

Citrus Fruit

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Irrigation, Nutrition, and Citrus Fruit Quality

EDIS ◽

10.32473/edis-ss426-2003 ◽

1969 ◽

Vol 2003 (12) ◽

Author(s):

Mongi Zekri ◽

Tom A. Obreza ◽

Robert Koo

Keyword(s):

Fruit Quality ◽

Cooperative Extension ◽

Citrus Fruit ◽

Cooperative Extension Service ◽

Extension Service ◽

Science Department ◽

University Of Florida ◽

Fact Sheet ◽

Water Science ◽

Soil And Water

The effects of irrigation and nutrition on fruit quality are important and should be understood and taken into consideration by citrus growers and production managers to increase profitability and enhance sustainability and worldwide competitiveness. This document is SL 207, a fact sheet of the Soil and Water Science Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. First printed: April 2003. SL 207/SS426: Irrigation, Nutrition, and Citrus Fruit Quality (ufl.edu)

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Study on the Fruit Quality of Different Canopy and Tree Shapes of Huangguogan Citrus

E3S Web of Conferences ◽

10.1051/e3sconf/202020602019 ◽

2020 ◽

Vol 206 ◽

pp. 02019

Author(s):

Liping Tan ◽

Zhaofang Chen ◽

Youting Yang ◽

Qing Zhang ◽

Xia Qiu ◽

...

Keyword(s):

Fruit Quality ◽

Sugar Content ◽

Citrus Fruit ◽

Soluble Solids ◽

Appearance Quality ◽

Tree Fruit ◽

Intrinsic Quality ◽

Different Shapes ◽

Better Than

In this paper, Shimian yellow citrus fruit was used as material to study the differences of HuangGuo citrus fruit strains by sampling, measuring and analyzing the fruit quality according to different shapes and canopy. The results showed that: in the yellow fruit citrus plants fruit quality was better than the performance of the lower part of the upper canopy, appearance quality did not change significantly, little difference; intrinsic quality significantly different soluble solids and sugar content than other obvious difference; round tree fruit quality was better than natural growth happy shape and form.

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Rootstocks Influence Yield Precocity, Productivity, and Pre-Harvest Fruit Drop of Mandared Pigmented Mandarin

Agronomy ◽

10.3390/agronomy10091305 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1305

Author(s):

Marco Caruso ◽

Alberto Continella ◽

Giulia Modica ◽

Claudia Pannitteri ◽

Riccardo Russo ◽

...

Keyword(s):

Fruit Quality ◽

Agricultural Research ◽

Fruit Size ◽

Citrus Fruit ◽

High Sensitivity ◽

Quality Parameters ◽

Poncirus Trifoliata ◽

Soluble Solids ◽

Citrus Paradisi ◽

Fruit Drop

Citrus fruit quality and scion productivity are influenced by the choice of rootstock. We aimed to evaluate the effect of rootstocks on yield and fruit quality of Mandared, a triploid pigmented mandarin. To do so, we established a rootstock field trial on a high pH soil (8.6) in which Mandared was grafted onto 11 rootstocks. These included some standard rootstocks, such as trifoliate orange ((Poncirus trifoliata (L.) Raf.), Troyer citrange (Citrus sinensis (L.) Osb. × P. trifoliata), Swingle citrumelo (Citrus paradisi Macf. × P. trifoliata), and C35 citrange (C. sinensis × P. trifoliata), as well as new releases from the Council for Agricultural Research and Economics (CREA, Acireale, Italy) and the University of California Riverside (UCR). The cumulative yield was measured over five consecutive years, while fruit quality was analyzed for two years. The trees on C35, C57 (Citrus sunki Hort. ex. Tan. × P. trifoliata), and C22 (C. sunki × P. trifoliata), started to set fruits one year earlier than the others. The trees on C57 provided some of the highest cumulative yields and canopy volumes. The production of Mandared grafted onto C57 was double that of Mandared grafted onto Troyer, while Mandared grafted onto C35 and C22 resulted in the best yield efficiency. The trees on Swingle and C57 significantly reduced the pre-harvest fruit drop, to which Mandared is particularly sensitive. However, grafting Mandared onto Swingle resulted in the highest variation among replicates, probably due to its high sensitivity to iron chlorosis. Most of the fruit quality parameters, such as fruit size, total soluble solids (TSS), and acidity were not significantly different among the rootstock treatments. However, fruits produced by Mandared grafted onto C22 had one of the highest rates of anthocyanin accumulation. The results indicate that C57, C35, and C22 were the most suitable rootstocks for Mandared in South-Eastern Sicily.

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Salicylic Acid and Putrescine to Reduce Post-Harvest Storage Problems and Maintain Quality of Murcott Mandarin Fruit

Agronomy ◽

10.3390/agronomy10010115 ◽

2020 ◽

Vol 10 (1) ◽

pp. 115 ◽

Cited By ~ 4

Author(s):

Hassan A. Ennab ◽

Mervat A. El-Shemy ◽

Shamel M. Alam-Eldein

Keyword(s):

Weight Loss ◽

Salicylic Acid ◽

Fruit Quality ◽

Citrus Fruit ◽

Storage Period ◽

Soluble Solids ◽

Post Harvest ◽

Deterioration Rate ◽

Reduce Weight Loss

Natural products have been used to improve citrus fruit quality and storability, which increase the fruit marketing period and exportation to distant markets. This study was conducted to evaluate the role of salicylic acid and putrescine on reducing post-harvest loss and maintaining the quality of stored Murcott mandarin. Fruit were harvested at 297–300 days from full bloom, and five 5-min dipping treatments were applied; salicylic acid (200 and 400 ppm), putrescine (50 and 100 ppm), and the control. One group of fruit was stored at 5 ± 1 °C and 90–95% relative humidity (RH), and the other group was stored at 23 ± 1 °C and 60–70% RH for 45 days. Quality attributes were recorded at harvest, 15, 30, and 45 days of storage. Weight loss and decay were significantly decreased with the application of salicylic acid and putrescine. Both materials were also effective maintaining fruit firmness, total soluble solids (TSS), acidity, TSS: acid ratio, and ascorbic acid during storage. Salicylic acid, especially at 400 ppm was more effective to reduce weight loss and decay, and to maintain fruit quality in comparison to putrescine treatments. It could be concluded that salicylic acid and putrescine are effectively delaying post-harvest deterioration rate and extending the storage period of Murcott mandarin fruit with acceptable quality.

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