scholarly journals Gibberellic Acid, Fruit Freezing, and Post-freeze Quality of `Hamlin' Oranges

2006 ◽  
Vol 16 (2) ◽  
pp. 301-305 ◽  
Author(s):  
Frederick S. Davies ◽  
Glenn Zalman
Keyword(s):  
Gibberellic Acid ◽  
Cold Hardiness ◽  
Poncirus Trifoliata ◽  
Soluble Solids ◽  
Titratable Acid ◽  
Fruit Drop ◽  
Solids Content ◽  
Orange Trees ◽  
Juice Content

Our objectives were to determine if gibberellic acid (GA3) application at color break in the fall affected the juice content, soluble solids content (SSC), titratable acid (TA), and ratio of SSC: TA of `Hamlin' orange (Citrus sinensis) fruit following moderate to severe freezes. We also wanted to know if GA3 affected the post-freeze rate of decrease in juice content, fruit and tree cold hardiness, and the amount of fruit drop following a freeze. GA3 (18 floz/acre) was applied at color break in the fall of 2002, 2003, and 2004 to `Hamlin' orange trees on Swingle citrumelo (C. sinensis × Poncirus trifoliata) rootstock planted in 1995 at Gainesville, Fla. Moderate to severe freezes occurred in all three seasons. Fruit were harvested at about 2-week intervals following freezes in each season and the internal fruit quality was determined. GA3-treated fruit generally had higher juice content compared with nontreated fruit for 8 weeks after moderate to severe freezes in all three seasons, which may be economically important to citrus processors and growers since Florida growers are paid based on fruit pounds-solids (juice content × SSC). The rate of decrease in juice content over time was similar for both treatments in seasons one and two, but was less for GA3-treated fruit than nontreated fruit in season three. In addition, SSC was equal to or slightly greater for fruit treated with GA3 than for nontreated fruit. Fruit drop rate and magnitude were also significantly less for the GA-treated compared with nontreated trees in two of three seasons. GA3 did not affect fruit, leaf, or tree cold hardiness in any season.

scholarly journals Gibberellic Acid, Rootstocks, and Post-freeze Fruit Quality of ‘Rohde Red’ Valencia Oranges

HortScience ◽  
2007 ◽  
Vol 42 (3) ◽  
pp. 565-570
Author(s):  
Frederick S. Davies ◽  
Glenn Zalman
Keyword(s):  
Gibberellic Acid ◽  
Titratable Acidity ◽  
Poncirus Trifoliata ◽  
Soluble Solids ◽  
Soluble Solids Content ◽  
Randomized Design ◽  
Citrus Volkameriana ◽  
Solids Content ◽  
Orange Trees ◽  
Juice Content

The authors’ objectives were to determine whether gibberellic acid (GA3) initially increases juice content of ‘Rohde Red’ valencia oranges and prevents or delays decreases in juice content after a freeze, and to determine whether there is an interaction between GA3, rootstock, and juice content. The experiment consisted of a 2 (+, –GA3) × 3 (rootstock) factorial using a completely randomized design with 10 replications per treatment. Gibberellic acid was applied to mature ‘Rohde Red’ valencia [Citrus sinensis (L.) Osb.] orange trees on three rootstocks—Citrus volkameriana Ten. & Pasq.(Volk), Swingle citumelo [C. paradisi Macf. ×Poncirus trifoliata (L.) Raf.], and Carrizo citrange [C. sinensis ×P. trifoliata]—at color break in Fall 2002, 2003, and 2004. Juice content, soluble solids content (SSC), titratable acidity (TA), ratio of SSC to TA, and kilogram solids per box were determined at about 2-week intervals after several freezes. In 2002–03 and 2004–05, juice content in the fall was greater and the rate of decrease in juice content lower for GA3-treated fruit than nontreated fruit for about 8 weeks after a freeze. In contrast, in 2003–04, juice content and rate of decrease in juice content were not different between treatments. Juice content was lower for fruit from ‘Rohde Red’ trees on Volk compared with those on Carrizo and Swingle, and more important, the rate of decrease in juice content after a freeze was greatest for trees on Volk in all three seasons. Soluble solids content, TA, SSC-to-TA ratio, and kilogram solids generally were not effected by GA3 treatment. Therefore, GA3 application at color break in the fall generally increased juice content and slowed the rate of decrease in juice content after a freeze compared with nontreated fruit. In addition, juice content differed significantly with rootstock, but there was no GA3 × rootstock interaction.

scholarly journals Fruit Abscission and Fruit Quality of Apples Following Use of Dicamba to Control Preharvest Drop

1990 ◽  
Vol 115 (3) ◽  
pp. 390-394 ◽  
Author(s):  
Richard P. Marini ◽  
Ross E. Byers ◽  
Donald L. Sowers ◽  
Rodney W. Young
Keyword(s):  
Fruit Quality ◽  
Starch Content ◽  
Soluble Solids ◽  
Naphthaleneacetic Acid ◽  
Soluble Solids Content ◽  
Fruit Abscission ◽  
Fruit Drop ◽  
Solids Content ◽  
Methoxybenzoic Acid

Five apple (Malus domestica Borkh.) cultivars were treated with dicamba at concentrations of 0 to 200 mg·liter-1 during 3 years. Although the response varied with cultivar, dose, and year, dicamba always delayed fruit abscission. At similar concentrations, dicamba usually reduced fruit drop more than NAA, but less than fenoprop. Dicamba at 10 mg·liter-1 effectively delayed drop of `Delicious', whereas 20 to 30 mg·liter-1 was required for `Red Yorking', `Rome', `Winesap', and `Stayman'. Dicamba did not influence flesh firmness, soluble solids content, water core, or starch content at harvest or after storage. Chemical names used: naphthaleneacetic acid (NAA); 2-(2,4,5-trichlorophenoxy)propionic acid (fenoprop); 3,6dichloro-2-methoxybenzoic acid (dicamba).

scholarly journals Effects of Preharvest Gibberellic Acid Applications on Fruit Quality of ‘0900 Ziraat’ Sweet Cherry

2009 ◽  
Vol 19 (1) ◽  
pp. 127-129 ◽  
Author(s):  
Fatih A. Canli ◽  
Hikmet Orhan
Keyword(s):  
Gibberellic Acid ◽  
Fruit Quality ◽  
Sweet Cherry ◽  
Prunus Avium ◽  
Soluble Solids ◽  
Pedicel Length ◽  
Yellow Color ◽  
Solids Content ◽  
Optimum Application

The objective of this study was to determine the effects of gibberellic acid (GA3) applications on fruit quality of ‘0900 Ziraat’ sweet cherry (Prunus avium), a low cropping and a large-fruited variety. ‘0900 Ziraat’ trees were sprayed with 0, 15, 20, and 25 ppm GA3, when the fruit were at their straw-yellow color stage. Fruit quality was evaluated at harvest in terms of size, firmness, pedicel length, and soluble solids content (SSC) to determine the optimum application. Fruit treated with GA3 were significantly larger and firmer than the controls. There were no differences in fruit firmness within the different levels of GA3 treatment; however, fruit treated with 20 and 25 ppm GA3 were significantly larger than the fruit treated with 15 ppm GA3. Trees treated with the optimum concentration of GA3 (25 ppm) in two different locations yielded fruit with 13.4% and 14.1% greater weight and 38% and 25% higher firmness. GA3 treatments did not affect pedicel length. The effect of GA3 application on SSC was complex; there was a significant interaction between GA3 and location. Being firmer than the controls, the GA3-treated fruit could be harvested at a later date than the controls.

scholarly journals Yield, Tree Size, and Fruit Quality of Mature ‘Owari’ and ‘Brown Select’ Satsuma on Poncirus trifoliata ‘Rubidoux’ and ‘Flying Dragon’ Rootstocks in North Florida

HortScience ◽  
2015 ◽  
Vol 50 (11) ◽  
pp. 1650-1653 ◽  
Author(s):  
Peter C. Andersen ◽  
Brent V. Brodbeck
Keyword(s):  
Fruit Quality ◽  
Cold Hardiness ◽  
Fruit Weight ◽  
Poncirus Trifoliata ◽  
Tree Size ◽  
Soluble Solids ◽  
Quality Data ◽  
Volume Yield ◽  
Canopy Area

There is increasing interest in the culture of satsuma citrus in the states bordering the northern Gulf of Mexico. Yield, tree size, and fruit quality of mature ‘Owari’ and ‘Brown Select’ satsuma (Citrus unshiu Marcovitch) on Poncirus trifoliata (L.) Raf. (‘Rubidoux’ and ‘Flying Dragon’) were evaluated in north Florida. Canopy area and volume, yield, and fruit quality data were analyzed as a 2 × 2 factorial design with scion and rootstock as the main effects. There were no scion × rootstock interactions. Overall average yield per tree was 16, 88, 91, 143, and 101 kg in 2010, 2011, 2012, 2013, and 2014, respectively. Yield was influenced by scion (higher for ‘Brown Select’) in three of five years, and by rootstock every year (higher for ‘Rubidoux’). Yield per tree was ≈2-fold greater for trees on ‘Rubidoux’ compared with ‘Flying Dragon’; the highest yield was recorded for ‘Brown Select’ on ‘Rubidoux’. Yield per m2 canopy area was often similar since canopy area was often ≈2-fold greater for trees on ‘Rubidoux’. For three of the five years, fruit weight was greater for ‘Brown Select’ (average = 157 g) than ‘Owari’ (average = 146 g), with no rootstock effect. Soluble solids of juice averaged 10.0 °Brix and were higher for trees on ‘Flying Dragon’ than on ‘Rubidoux’ in three of five years. Juice pH averaged 3.67 and was unaffected by scion or rootstock. Trees were not subjected to freeze protection and were not damaged by minimum temperatures as low as −9.4 °C, except for 2014/15. A rating of defoliation after a freeze on 19 Nov. 2014 (−5.6 °C) indicated that cold hardiness varied by scion (greater for ‘Brown Select’) and rootstock (greater for ‘Rubidoux’). Differences in cold hardiness did not persist when assessed later in the winter. Successful satsumas production can be achieved in north Florida in the absence of a severe freeze event.

Response of pre-harvest drop of grapefruit on two rootstocks to 2,4-D, MCPA and gibberellic acid

1982 ◽  
Vol 22 (117) ◽  
pp. 337 ◽  
Author(s):  
RA Sarooshi
Keyword(s):  
Gibberellic Acid ◽  
Poncirus Trifoliata ◽  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Rough Lemon ◽  
Fruit Drop ◽  
South Wales ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

Several formulations, concentrations and timings of sprays of 2,4-D (2,4-dichlorophenoxyacetic acid) and MCPA (4-chloro-2-methyl phenoxyacetic acid) were tested for their ability to reduce pre-harvest drop of late hanging Marsh grapefruit growing on rough lemon (Citrus jambheri) and trifoliata (Poncirus trifoliata) rootstocks at Dareton in south-western New South Wales. Gibberellic acid was also tested in several timing combinations with 2,4-D for its ability to improve the quality of late hanging fruit. On rough lemon the established standard treatment of 2,4-D at 20 ppm applied in mid-May was as good or better than all other treatments. On trifoliata this standard spray was again as effective as all others in preventing drop up to mid-November, but a similar spray applied in midJune was more effective from mid-November to mid-December. MCPA applied at 10 or 20 ppm in mid-May was not as effective as the standard spray. The best treatments reduced the average cumulative fruit drop, of 39% on trifoliata and 70% on rough lemon, by at least a half. When gibberellic acid at 10 ppm was added to the standard mid-May spray of 2,4-D, or when it followed it in mid June, it improved the colour and appearance and reduced the rind thickness and puffiness of late hanging fruit.

scholarly journals Effect of Vector Control and Foliar Nutrition on Quality of Orange Juice Affected by Huanglongbing: Chemical Analysis

HortScience ◽  
2017 ◽  
Vol 52 (8) ◽  
pp. 1100-1106 ◽  
Author(s):  
Elizabeth Baldwin ◽  
Jinhe Bai ◽  
Anne Plotto ◽  
John Manthey ◽  
Smita Raithore ◽  
...  
Keyword(s):  
Principal Component ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Good Separation ◽  
Foliar Nutrition ◽  
Valencia Orange ◽  
Liberibacter Asiaticus ◽  
Solids Content ◽  
Orange Trees

‘Valencia’ orange trees from groves with 90% infection by Candidatus liberibacter asiaticus (CLas), the presumed pathogen for citrus greening or huanglongbing (HLB) disease, were treated with insecticide (I), a nutritional spray (N), and insecticide plus nutritional spray (I + N). Controls (C) were not treated. Fruit were harvested in March to April, 2013, 2014, and 2015, juiced, and the juice was frozen for later chemical analyses. Titratable acidity (TA), soluble solids content (SSC), SSC/TA ratio, many volatiles, flavonoids, and limonoids showed differences because of season, whereas SSC, several volatiles (ethanol, cis-3 hexenol, α-terpinene, ethyl acetate, and acetone), flavonoids (narirutin, vicenin-2, diosmin, nobiletin, heptamethoxy flavone), and limonoids (nomilin and nomilinic acid glucoside) showed differences because of treatment. However, consistent patterns for chemical differences among seasons were not detected. TA tended to be higher in N and C the first two seasons and SSC/TA higher in I and I + N for all seasons (not significant for 2014). Bitter limonoids tended to be higher in I, N or I + N over the seasons. Principal Component Analysis showed that there was a good separation by season overall and for treatment in 2013. In 2014 and 2015, the insecticide treatments (either I or I + N) had the highest sugar and SSC/TA levels and lowest TA levels, although not always significant, as well as higher juice CLas cycle threshold (Ct) levels, indicating lower levels of the pathogen.

Effect of Different Temperatures on the Quality of Dendrobium Officinale Storage

2013 ◽  
Vol 781-784 ◽  
pp. 1519-1522 ◽  
Author(s):  
Ding Ai Cao ◽  
Hai Jiao Liu ◽  
Hai Dong Liu ◽  
Chong Xiao Shao ◽  
Xi Hong Li ◽  
...  
Keyword(s):  
Weight Loss ◽  
Membrane Permeability ◽  
Storage Temperature ◽  
Membrane Lipid ◽  
Soluble Solids ◽  
Dendrobium Officinale ◽  
Titratable Acid ◽  
Different Temperatures ◽  
Solids Content

In this research, Dendrobium officinale was studied at different storage temperatures for water loss, soluble solids, titratable acids, membrane permeability, malonaldehyde (MDA) changes. Results showed that weight loss rate was positively associated with storage temperature, the higher of storage temperature, the weight loss more severe and the quality of dendrobium stem was lower. Dendrobium’s titratable acid content, soluble solids content changed slowly than 10°C, 20°Cwhen it was stored in 0°C temperature but their content were higher than 10°C, 20°C samples . Storage temperature is positively correlated with the change of membrane permeability and malonaldehyde (MDA) as the extension of storage time, high temperature will damage the membrane permeability of Dendrobium and at the same time the production of membrane lipid peroxidation caused.

Effect of SO2 Interval Fumigation on Storage Quality of Red Grape

2013 ◽  
Vol 411-414 ◽  
pp. 3170-3173
Author(s):  
Yu Long Ding ◽  
Xiang Zheng Yang ◽  
Xi Hong Li ◽  
Hong Yuan Ma
Keyword(s):  
Soluble Solids ◽  
Postharvest Quality ◽  
Control Group ◽  
Storage Quality ◽  
Safety Standard ◽  
Titratable Acid ◽  
Solids Content ◽  
Red Grape ◽  
And Control

Taking Red Grape as material, studied on the effect of SO2interval fumigation treatments on postharvest quality and SO2residue of fruit stored under 0 °C. The results indicated that after 120 days of storage, all treatment could decrease the decay rate, inhibited the decrease of soluble solids content and titratable acid, and the SO2interval fumigation showed a stronger ability compared with convention fumigation. The SO2residue in grape pulp in TR2 group was14.5mg·kg-1which beyond the FDA safety standard (10 mg·kg-1) and bleaching rate was 7.8% higher than TR1 and control group.

Quality of Carrots Grown for Processing as Affected by Nitrogen Fertilization and Harvest Term

2009 ◽  
Vol 70 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Marek Gajewski ◽  
Zenon Węglarz ◽  
Anna Sereda ◽  
Marta Bajer ◽  
Agnieszka Kuczkowska ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Soluble Solids ◽  
Soluble Solids Content ◽  
Carrot Juice ◽  
Harvest Time ◽  
Experimental Station ◽  
Colour Parameters ◽  
Solids Content ◽  
Nitrates Content

Quality of Carrots Grown for Processing as Affected by Nitrogen Fertilization and Harvest TermIn 2007-2008 the effect of nitrogen fertilization and harvest term on quality of two carrot cultivars was investigated. The field experiment was carried out in Żelazna Experimental Station of Warsaw University of Life Sciences. Karotan F1and Trafford F1cultivars, commonly grown for juice industry, were the objects of the experiment. Carrot seeds were sown at the beginning of May. Nitrogen fertilization was applied in five rates, ranged from 0 to 120 kg·ha-1and in two terms — before sowing and in the middle of growing season. Roots were harvested in three terms: mid-September, mid-October and the first decade of November. After harvest there were determined: nitrates (NO3) content in carrot roots and juice, soluble solids, colour parameters of juice in CIE L*a*b*system. The dose and the term of nitrogen fertilization influenced nitrates content in carrots, and the highest NO3concentration was found in carrots fertilized with 120 kg·ha-1of N before sowing. Karotan showed higher nitrates accumulation than Trafford. The content of nitrates in the roots was markedly higher than in carrot juice. Nitrates content in carrots decreased with delaying of harvest time, in opposite to soluble solids content. Soluble solids content and colour parameters of carrot juice were not affected by nitrogen fertilization, but the lowest L*, a*and b*values were observed at the last term of harvest.

scholarly journals Production and quality of melon hybrid Mandacaru irrigated with different levels of salinity

2011 ◽  
Vol 29 (4) ◽  
pp. 600-604 ◽  
Author(s):  
Damiana Cleuma de Medeiros ◽  
José Francismar de Medeiros ◽  
Francisco Aécio de L Pereira ◽  
Sonally Cristina de M Silva ◽  
Maria das Graças Amâncio
Keyword(s):  
Block Design ◽  
Fruit Production ◽  
Solid Content ◽  
Salinity Level ◽  
Soluble Solids ◽  
Northeastern Brazil ◽  
Soluble Solid Content ◽  
Salinity Levels ◽  
Solids Content

Among the problems faced by the melon crop in the state of Rio Grande do Norte, northeastern Brazil, the effect of water and soil salinity is considered one of the key factors to limit fruit production and quality. The aim of this work was to study the effects of using irrigation waters with different salinity levels on yield and quality of fruits of the yellow melon hybrid Mandacaru. A randomized complete block design was used with five treatments (irrigation water salt concentrations: 0.54, 1.48, 2.02, 3.03, 3.9 dS m-1) and four replications. The effects of these concentrations were evaluated through, number of marketable fruits per plant, marketable and total fruit yield, average marketable fruit mass, soluble solids content and pulp firmness. Increment in water salinity level negatively influenced crop yield. The 3.9 dS m-1 salinity level caused yield losses of 20.31%, due to the reduction of fruit number per plant. The highest soluble solid content and the highest pulp firmness values were estimated to occur at salinity levels 2.09 and 3.5 dS m-1, respectively.

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