scholarly journals Chemical composition of sea-buckthorn and highbush blueberry fruits grown in the Republic of Belarus

2019 ◽  
Vol 2 (2) ◽  
pp. 121
Author(s):  
Maria Zenkova ◽  
Julia Pinchykova
Keyword(s):  
Chemical Composition ◽  
Organic Acids ◽  
Sugar Content ◽  
Vaccinium Corymbosum ◽  
Climatic Conditions ◽  
Solid Content ◽  
Sea Buckthorn ◽  
Highbush Blueberry ◽  
Pectin Content ◽  
The Republic

Chemical composition of sea-buckthorn and highbush blueberry fruits determines their value while using them fresh or processed. Berries have distinctive characteristics depending on a variety, soil and climatic conditions and growing techniques. The object of the researches have been Sea-buckthorn (Hippophae L.) of three varieties (Podarok sadu, Trofimovskaya, Botanicheskaya) and Highbush Blueberry (Vaccinium corymbosum L.) of five varieties (Duke, Bluetta, Bluecrop, Northland, Coville) grown in the Republic of Belarus. Sea-buckthorn and Highbush Blueberry fruits chemical composition has been studied during a three-year cycle of monitoring using standard methods and in accordance with technical legal acts of the Republic of Belarus. Solid content (13,0-15,3%), sugar content (4,00-4,80%), organic acids (1,10-2,05%), nitrogen substances content (0,29-0,46%), lipids (3,6-6,2%), pectin content (0,40-0,50%), fiber (3,20-4,90%), minerals, vitamin С (44,7-78,7 мг/100г), β-carotene (4,4-13,2 мг/100г) have been studied in Sea-buckthorn (Hippophae L.). Solid content (12,2-15,1%), sugar content (2,73-3,96%), organic acids (0,59-0,95%), pectin content (0,57-0,97%), fiber (1,20-1,68%), bioflavonoids (276-368 мг/100 г), bioflavonoids complex fractional composition (anthocyanins, leucoanthocyanins, catechines, flavonols), vitamin С (60,5-72,2 мг/100 г) and mineral content have been studied in Highbush Blueberry (Vaccinium corymbosum L.). Exogenous contaminants content (arsenic, heavy metals), hygienical safety indexes, caesium 137 radionuclides content have been investigated in the fruits. Specific varieties characterictics of Sea-buckthorn (Hippophae L.) and Highbush Blueberry (Vaccinium corymbosum L.) fruit chemical composition have been determined. The studied fruit is fully safe and can be recommended to be used both fresh and processed.

ASSESSMENT OF THE BIOCHEMICAL COMPOSTION OF BLACKBERRIES IN CONNECTION WITH THE USE IN BREEDING

2020 ◽  
Vol 5 (86) ◽  
pp. 170-176
Author(s):  
D.I. Matnazarova ◽  
◽  
Keyword(s):  
Ascorbic Acid ◽  
Organic Acids ◽  
Sugar Content ◽  
Soluble Solids ◽  
High Accumulation ◽  
Foreign Countries ◽  
High Sugar Content ◽  
The Usa ◽  
The Republic ◽  
Active Substances

The work summarized the literature data on the content of chemicals in blackberries grown in various regions of Russia and foreign countries. Much attention is paid to the level of accumulation of biochemical components: soluble solids, sugars, organic acids, vitamins C (ascorbic acid) and P (phenolic compounds). In the studied regions, a high accumulation of anthocyanins (307-651 mg / 100 g) and ascorbic acid (23.4-54.0 mg / 100 g) in blackberries was noted in the Republic of Adygea. The highest sugar content (9.9%) was in blackberries grown in the middle zone of Russia. The average content of the studied components depends not only on the region of cultivation, but, first of all, on the varietal composition of the crop. The study of 25 blackberry varieties bred in the USA, England and Australia in the Krasnodar Territory allowed us to identify the most adapted of them for cultivation in the south of Russia,the most promising varieties are Thornfree, Smoothstem and Black Satin. In the Republic of Belarus, blackberries are grown on personal subsidiary plots, the most common is the American Agavam variety, which is noted for its high sugar content and the content of P-active substances. At the Maikop Experimental Station. N.I. Vavilov, as a result of studying the biochemical composition of blackberry berries, the following varieties were identified: by the content of dry matter – Oregon, Black Satin, Thornfree; sugar content – Oregon, Silvon, Black Satin, Thornfree, Young; by the content of organic acids – Derrow, Raven (1.67%), Cherokki (1.87%); by the content of ascorbic acid – Himalaya (54.6 mg / 100 g), Derrow (45.8 mg / 100 g), Raven (45.4 mg / 100 g) and Cherokki (47.8 mg / 100 g).

scholarly journals Effect of a grey hail protection net on the fruit quality of the ‘Bluecrop’ highbush blueberry (Vaccinium corymbosum L.)

2017 ◽  
Vol 62 (4) ◽  
pp. 329-339
Author(s):  
Jasminka Milivojevic ◽  
Dragan Radivojevic ◽  
Mirjana Ruml ◽  
Suzana Urosevic ◽  
Jelena Dragisic-Maksimovic
Keyword(s):  
Vaccinium Corymbosum ◽  
Fruit Shape ◽  
Fruit Weight ◽  
Solid Content ◽  
Planting Density ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Soluble Solid Content ◽  
Highbush Blueberry

The main focus of our study was to investigate effects of the modified microclimate under a grey hail protection net (HPN) on biometrical fruit characteristics (fruit weight, index of fruit shape, and seed number per fruit) and nutritional value (soluble solid content - SSC, titratable acidity - TA, total anthocyanins - TACY, total phenolics - TPH and total antioxidant capacity - TAC) of the ?Bluecrop? highbush blueberry (Vaccinium corymbosum L.). The study was conducted in the ?Bluecrop? highbush blueberry plantation located in Mladenovac (Serbia) during two consecutive years (2013, 2014). The orchard was established using two-year-old nursery trees in spring 2011, at a planting density of 3,300 bushes per ha. The grey polyethylene net (SILVERLUX?, Helios Group, Lurano, Italy) with a Leno wave structure and a mesh size of 2.8 x 8 mm was used. During the research period, light intensity was measured weekly at 12.00 hr using a digital lux-meter ?Peak teck? PT-5025 (Germany). Air temperature and relative humidity within the canopy were recorded using climate dataloggers (type DT-171, Shenzhen Flus Technology Co., Ltd, China) both under HPN and in the open field (OF). Twelve readings per treatment were taken at 2-hour intervals every day in each season. In both years of observation, light was reduced by 5-20% under HPN, whereby daily maximum temperature was 2.4?C lower causing 4% higher daily minimum relative air humidity than in OF. ?Bluecrop? had significantly higher average fruit weights under HPN ranging from 1.93 g (2013) to 1.86 g (2014) in comparison to those observed in OF. The SSC did not differ between the treatments in 2014, whereas a significantly higher mean value was registered in the fruits harvested under HPN (12.8%) compared to those from OF in 2013. The mean TA was higher under HPN in 2014 (0.57%), whereas in 2013 a significantly higher TA content was found in OF (0.87%). HPN showed a positive effect on the TPH content (7.12 mg GA/g FW), but an almost 2-fold higher value was registered in 2013. Similar to this, TAC was 2.5-fold higher in 2013, without a significant effect of HPN in both experimental years.

scholarly journals Foliar Calcium Corrects a Deficiency Causing Green Fruit Drop in ‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)

Agriculture ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 63 ◽  
Author(s):  
Eric Gerbrandt ◽  
Charles Mouritzen ◽  
Mark Sweeney
Keyword(s):  
Vaccinium Corymbosum ◽  
N Fertilization ◽  
Climatic Conditions ◽  
Economic Losses ◽  
Highbush Blueberry ◽  
High Concentration ◽  
Physiological Disorder ◽  
Fertilization Rates ◽  
Green Fruit ◽  
Fruit Drop

‘Draper’ northern highbush blueberry (Vaccinium corymbosum L.) is a widely-planted mid-season cultivar with excellent fruit quality. Under the climatic conditions of Southwestern British Columbia, Canada, and Northwestern Washington, USA, it expresses a physiological disorder causing spontaneous green fruit drop (GFD) of up to half of the developing crop just prior to onset of the fruit coloring phenophase. Reduction of economic losses due to GFD required identification of the cause of this disorder and development of an agronomic solution that would reduce fruit drop. In 2014, two initial experiments were conducted to compare three foliar Ca products under a range of N fertilization rates. In 2015 and 2016, three locations were used in a first step to optimizing rates and timings of foliar Ca application. Initial experiments determined that higher N fertilization rates exacerbate GFD but that foliar Ca corrects the condition. Multi-site, multi-year trials identified key rates and timings for foliar Ca application to provide an agronomic solution for commercial growers. These trials identified an acute fruit Ca deficiency as the cause of GFD, and that foliar calcium applied frequently at high concentration from mid-bloom onward can be effective in reducing GFD, often to negligible levels. This condition has now been reported in several production regions around the world.

scholarly journals Study on Chemical Composition of Fresh Mymensingh and Barishal Hog-plum (Spondius mangifera) and Developed Leather and Jelly and Sensory Evaluation

2013 ◽  
Vol 5 (2) ◽  
pp. 29-36 ◽  
Author(s):  
S Akter ◽  
SMS Shahriar ◽  
F Akter ◽  
S Morshed ◽  
MN Islam
Keyword(s):  
Chemical Composition ◽  
Vitamin C ◽  
Sugar Content ◽  
Solid Content ◽  
Reducing Sugar ◽  
Soluble Solids ◽  
Chemical Compositions ◽  
Soluble Solid ◽  
Hedonic Scale ◽  
Hog Plum

The study was concerned with the chemical composition of two varieties hog-plum Pulp collected from Mymensingh and Barishal and developed jelly and leather. Cabinet dryer, model OV-165 (Gallen Kamp Company) was used for dehydration of two types of hog-plum pulp and leather. The fresh and dried hog-plum and hog-plum products were analyzed for their moisture, ash, vitamin-C, pH, total soluble solids and sucrose contents. The moisture content, ash, vitamin C, pH, total soluble solid (TS), reducing sugar and non-reducing sugar of Barishal hog-plum’s was 83.84% (wb), 0.81% , 33.00 mg/100g, 2.62, 8.5%, 5.02% and 1.6% respectively; Mymensingh hog-plum’s was 86.69% (wb), 0.78%, 30.90 mg/100g, 2.7, 6.5%, 4.7% and 1.3% respectively. The chemical composition of Mymensingh and Braishal hog-plum showed that Barishal hog-plum contained higher solid content, ash, Vitamin C than Mymensingh hog-plum. It was found that Barishal hog-plum had higher flesh (67.59%) than Mymensingh hog-plum (62.60%). The chemical composition of hog-plum leather was analyzed for moisture, Ash, Vitamin C, TS, Titrable acidity, total sugar and protein content. The ash and sugar content of developed leathers from Barishal and Mymensingh hog-plum was very similar but the vitamin C content for developed products was very low. It was also found developed products contained higher amount and sugar and protein. It was found that the chemical compositions of developed jelly were more or less similar to the fresh hog-plum; only the vitamin C was decreased significantly. These studies indicate that, developed products viz. lather and jelly would contain significantly higher amount of nutrients and energy then the fresh fruits. Organoleptic taste testing using 1-9 hedonic scale showed that jelly made from mechanically dried Mymensingh hog-plum was the most acceptable product and was ranked as “like very much”. Leather made from Mymensingh hog-plum (pulp+4.5% sugar+ 0.15% KMS) was the best among other samples and was ranked as “like very much”.DOI: http://dx.doi.org/10.3329/jesnr.v5i2.14598 J. Environ. Sci. & Natural Resources, 5(2): 29-36 2012

scholarly journals Prospects of treatment grapes in Crimea with locally produced chelate microfertilizers

2020 ◽  
pp. 216-220
Author(s):  
Наталья Васильевна Алейникова ◽  
Нина Владимировна Цирульникова ◽  
Павел Александрович Диденко ◽  
Елена Аркадьевна Никулина ◽  
Светлана Валентиновна Левченко
Keyword(s):  
Chemical Composition ◽  
Production Control ◽  
Sugar Content ◽  
Climatic Conditions ◽  
South Coast ◽  
Cabernet Sauvignon ◽  
The South ◽  
Control Chemical ◽  
Positive Effect ◽  
Phenological Phases

В статье представлены результаты исследований 2018-2019 гг., проведенных в почвенно-климатических условиях Южнобережной зоны виноградарства Крыма по изучению влияния внекорневых подкормок хелатными микроудобрениями Хелат В и Хелатон Экстра на винограде ценного технического сорта Каберне-Совиньон. В ходе исследований не выявлено изменений в продолжительности и сроках наступления фенологических фаз развития винограда на фоне применения изучаемых микроудобрений. Показано положительное влияние данных препаратов на вегетативное и генеративное развитие, количественные и качественные показатели урожая виноградной лозы. Экспериментально установлено, что двукратная внекорневая подкормка винограда изучаемыми микроудобрениями способствовала увеличению урожая в среднем на 11,8 % (0,7 т/га), увеличению прироста куста на 11,3 % (242,2 см3) и вызреванию однолетней лозы на 5 % в сравнении с производственным контролем. В опыте с использованием удобрения Хелатон Экстра отмечено улучшение химического состава ягод: содержание сахаров увеличилось на 8,5 %, содержание титруемых кислот снизилось на 7,1 %. The article presents the results of research of 2018-2019, conducted in the soil and climatic conditions of the South Coast zone of viticulture of Crimea to study the effect of foliar dressing with chelate microfertilizers Chelate B and Chelaton Extra on grapes of valuable wine variety ‘Cabernet-Sauvignon’. The study did not reveal any changes in the duration and timing of phenological phases of grape development on the back of application of the studied microfertilizers. The positive effect of these preparations on vegetative and generative development, quantitative and qualitative indicators of the grapevine yield is shown. It is experimentally established that double foliar processing of grapes with studied microfertilizers contributes to an increase in yield by 11.8% (0.7 t/ha), an increase in the bush growth by 11.3% (242.2 cm3) and ripening of an annual vine by 5% in comparison with production control. Chemical composition of berries was improved in the experiment when using Chelaton Extra fertilizer: sugar content increased by 8.5%, content of titratable acids decreased by 7.1%.

scholarly journals Production of Intersectional Hybrids between Colchicine-induced Tetraploid Shashanbo (Vaccinium bracteatum) and Highbush Blueberry ‘Spartan’

2013 ◽  
Vol 138 (4) ◽  
pp. 317-324 ◽  
Author(s):  
Hirotoshi Tsuda ◽  
Hisato Kunitake ◽  
Mai Yamasaki ◽  
Haruki Komatsu ◽  
Katsunori Yoshioka
Keyword(s):  
Sugar Content ◽  
Morphological Characteristics ◽  
Vaccinium Corymbosum ◽  
Soluble Solids ◽  
Highbush Blueberry ◽  
Chromosome Counting ◽  
Solids Concentration ◽  
Fruit Maturity ◽  
High Sugar Content ◽  
Soluble Solids Concentration

With crosses between colchicine-induced tetraploid shashanbo (Vaccinium bracteatum section Bracteata) and tetraploid highbush blueberry ‘Spartan’ (Vaccinium corymbosum section Cyanococcus), intersectional hybrids were produced. The hybridity of these plants was confirmed based on DNA markers and morphological characteristics. The morphological characteristics, blooming date, and ripening period of the hybrids were intermediate between those of the parents. Ploidy analyses by flow cytometry and chromosome counting revealed that these hybrids were tetraploid. Four hybrids set fruit in the field and these two hybrids showed high pollen stainability. It was noteworthy that fruit of two hybrids had high soluble solids concentration compared with ‘Spartan’ and the fruit pulp of the hybrids was tinged with red as shashanbo. These hybrids could be useful in breeding new cultivars with high sugar content, abundant phytochemicals, extensive environmental adaptability as well as late flowering and fruit maturity.

scholarly journals The content of the main chemical elements in sweet cherry fruits of different ripening periods

2021 ◽  
pp. 173-179
Author(s):  
L. Shubenko ◽  
S. Shokh ◽  
Yu. Fedoruk ◽  
D. Mykhailiuk ◽  
A. Vuiko
Keyword(s):  
Vitamin C ◽  
Organic Acids ◽  
Biochemical Composition ◽  
Sweet Cherry ◽  
Chemical Elements ◽  
Sugar Content ◽  
Weather Conditions ◽  
Climatic Conditions ◽  
Berry Crops ◽  
Early Ripening

The level of biochemical composition of sweet cherry fruits of different ripening periods was investigated. It has been established that the content of chemical elements in sweet cherry fruits depends on a number of factors. Fruits ripening period is listed frstaming the features of the pomological variety. Weather conditions during the formation and ripening of sweet cherry fruits have a signifcant effect on the content of chemicals. The variety Melitopolskaya krapchastaya was revealed to have a high content of dry soluble substances among all the studied varieties. In the group of late-ripening varieties, the smallest difference in the amount of acidifed acids in fruits between varieties is observed. The high content of organic acids was recorded for the Donetsk Ember variety, and the lowest one for the Turquoise variety. On average, for the varieties of different ripening periods, the highest content of organic acids was noted for early ripening varieties, and the lowest one for late ripening varieties. Having considered all the studied varieties as a whole, it can be asserted that the content of titratable acids was the highest in the fruits of the mid-ripening variety Alenushka, in relation to all other varieties; the lowest amount of organic acids was recorded for the late-ripening varieties Amazonka. The sugar content in the fruits of late-ripening sweet cherry varieties exceeded the average values of the groups of early-ripening and mid-ripening varieties. The mid-ripening variety Mirage was characterized by a high content of vitamin C, and the lowest value of this component of the chemical composition was obtained for the early-ripening variety Mlievskaya yellow. Taste qualities and biochemical composition of fruit and berry crops largely depend on the characteristics of the variety and climatic conditions of cultivation.The early ripening varieties Dar Mliyeva and Zoryana received the maximum tasting assessment. In the group of mid-ripening varieties, the Melitopolskaya krapchastaya variety was highly appreciated, and among the late-ripening varieties, the Turyuza variety. Key words: cherry varieties, dry soluble substances, sugars, organic acids, vitamin C, sugar-acid coefcient.

scholarly journals Research in biologically active substances of the volatile fraction from Highbush blueberry vegetative organs

2021 ◽  
Vol 14 (2) ◽  
pp. 185-193
Author(s):  
O. O. Stremoukhov ◽  
O. M. Koshovyi ◽  
M. A. Komisarenko
Keyword(s):  
Mass Spectrometry ◽  
Organic Acids ◽  
Vaccinium Corymbosum ◽  
Biologically Active ◽  
Volatile Fraction ◽  
Highbush Blueberry ◽  
Vegetative Organs ◽  
Mass Spectrometric Detector ◽  
Highbush Blueberries ◽  
Promising Source

Ukraine ranked second in the world after Peru in the pace of laying new Highbush blueberry plantations. Experts estimate that in 2018, in Ukraine, from 0.7 thousand hectares to 1.0 thousand hectares of new Highbush blueberry plantations were laid. Over the past 12 years, previously little-known product, Highbush blueberries have become one of the main berry crops. At present, commercial plantations blueberries take the 3rd place after black currants and strawberries. Zhytomyr region boasts the biggest areas planted with Highbush blueberries in Ukraine, followed by Volyn and Kyiv. According to estimates, the export of blueberries from Ukraine may increase to 20 thousand tons in 5 years. In addition to the use of Highbush blueberries in the food industry, they are a promising source of BAS for pharmaceutical and medical use, so their study is a promising area of pharmaceutical science. In Ukraine, there are no domestic standardized medicines manufactured from Highbush blueberries, and there are only foreign dietary and functional supplements. Abroad, Highbush blueberry medicines are used to improve vision and as astringents for colitis, enterocolitis and diarrhoea. In this regard, the development of domestic standardized medicines based on Highbush blueberries raw materials is an urgent task for modern pharmacy. The aim of the research was to study the phytochemical profile of the volatile fraction of Highbush blueberry vegetative organs (leaves, stems and fruits). Materials and methods. The objects of research were the leaves, fruits and stems of Highbush blueberry (Vaccinium corymbosum L.), in which the composition of the the volatile fraction components was studied by chromato-mass spectrometry on a gas chromatograph Agilent Technologies 6890 with a mass spectrometric detector 5973. Results. Chromato-mass spectrometry in the composition of volatile fractions of leaves, fruits and stems of Highbush blueberries revealed 65 substances. 49 substances were identified in the Highbush blueberry leaves, of which 36 substances of terpene nature, 13 organic acids, and 2 compounds were not identified. In the Highbush blueberries fruits, 47 substances were found, of which 36 substances are of terpene nature, 14 are organic acids and 3 were not identified. In the Highbush blueberries stems, 50 substances were found, of which 33 substances are of terpene nature, 14 are organic acids and one was not identified. Conclusions. As a result of phytochemical studies, it is for the first time that the component composition of volatile fractions of leaves, stems and fruits of Highbush blueberries from the flora of Ukraine was established. The content of 65 substances was identified and established, including 14 organic acids and 39 terpene compounds.

scholarly journals Nectar Production and Spectrum of Insect Visitors in Six Varieties of Highbush Blueberry (Vaccinium corymbosum L.) in SE Poland

2021 ◽  
Vol 74 ◽  
Author(s):  
Małgorzata Bożek
Keyword(s):  
Honey Bees ◽  
Vaccinium Corymbosum ◽  
Climatic Conditions ◽  
Sugar Yield ◽  
Sugar Concentration ◽  
Highbush Blueberry ◽  
Nectar Production ◽  
Se Poland ◽  
Nectar Sugar ◽  
Insect Visitors

Abstract The attractiveness of plants to pollinators depends strongly on flower rewards, especially nectar and pollen. Nectar mass, sugar concentration, and sugar mass are known to influence the spectrum and abundance of insect visitors. Respective data on nectar secretion in highbush blueberry ( Vaccinium corymbosum ) under the climatic conditions of Poland are scarce. This study was conducted in 2002–2005 to assess flower abundance, nectar production, and insect visitors in six varieties of V. corymbosum in Niemce, SE Poland. Flower abundance ranged from 1.63 ± 0.64 (‘Darrow’) to 4.07 ± 0.95 in thousands of flowers per shrub (‘Northland’). Nectar mass, sugar concentration, and nectar sugar mass increased with flower age, peaking between the sixth and ninth day. Significant differences in nectar characteristics occurred between years and between varieties. ‘Bluecrop’ and ‘Darrow’ produced the largest nectar mass (19.08 ± 7.09 and 16.60 ± 8.31 mg nectar per flower, respectively) and nectar sugar mass per flower (6.39 ± 1.52 and 5.76 ± 1.51 mg sugar per flower, respectively). The estimated sugar yield in the studied V. corymbosum varieties ranged from 9.4 ± 3.3 to 20.7 ± 3.8 g sugar per shrub (‘Croatan’ and ‘Bluecrop,’ respectively). Regarding insect visitors, only honey bees and bumble bees were observed. Honey bees comprised 81%–98% of the total number of observed insect visitors. Highbush blueberry, due to abundant blooming and high per-flower sugar yield, is thus a good source of nectar sugars for honey bees.

scholarly journals Foliar Applications of Calcium and Boron Do Not Increase Fruit Set or Yield in Northern Highbush Blueberry (Vaccinium corymbosum)

HortScience ◽  
2017 ◽  
Vol 52 (9) ◽  
pp. 1259-1264 ◽  
Author(s):  
Matthew Arrington ◽  
Lisa Wasko DeVetter
Keyword(s):  
Pacific Northwest ◽  
Fruit Set ◽  
Vaccinium Corymbosum ◽  
Climatic Conditions ◽  
Tissue Type ◽  
Highbush Blueberry ◽  
Foliar Sprays ◽  
Growing Seasons ◽  
The Pacific ◽  
Northern Highbush Blueberry

Fruit set in northern highbush blueberry (Vaccinium corymbosum L.) can be low under certain climatic conditions, contributing to reduced yields in northwestern Washington. The mechanisms influencing fruit set are complex, but reduced fruit set may be associated with inadequate nutrient availability during critical stages of flowering, ovule fertilization, and initial fruit development. Calcium (Ca) and boron (B) are of particular interest for reproductive developmental processes and are frequently applied annually by growers in the Pacific Northwest region because of the perception that these nutrients enhance fruit set and corresponding yields. Evaluation of commonly applied products containing these nutrients and their effects on fruit set and yield are of specific importance to justify the application of these nutrients. To address this, commercially available fertilizers containing Ca and B were applied to ‘Draper’ and ‘Bluecrop’ blueberry as foliar sprays, either alone or in combination, during the 2015 and 2016 growing seasons in northwestern Washington. Treatments included calcium chloride (750 and 1500 ppm Ca), calcium sulfate (150 ppm Ca), and tetra borate (125 and 250 ppm B) foliar sprays, repeated six times per season every 7–10 days from early pink bud through petal fall. No significant increases were observed for fruit set, estimated yield, and fruit quality (firmness and berry weight) across the treatments. Increased concentrations of B were observed in leaf tissues in 2015 and 2016, and to a lesser extent fruit tissues. Calcium remained unchanged regardless of treatment and tissue type. Under the conditions of this study, foliar applications of Ca and B did not lead to increased fruit set or yield. This research suggests that other approaches should be explored to increase fruit set and corresponding yields of highbush blueberry grown in northwest Washington.

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