The Effect of Maturity Stage on Nutritional Value of Leek, Zucchini and Kohlrabi

Biesiada, A.; Kolota, E.; Adamczewska-Sowińska, K.

doi:10.2478/v10032-007-0006-8

Cited by 16 publications

(15 citation statements)

References 8 publications

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“…There were significant varietal differences in ascorbic acid accumulation, in contrast to polyphenol content which was characterized by higher stability in both stems and especially in leaves ( Table 2). Among the cultivars, Goliath showed the highest ascorbic acid content; notably, all of the cultivars from domestic selection had lower levels of polyphenols compared to prior reports, which may be related to different crop cycles and harvest times [36]. Similar findings have been reported from an investigation in Belgium on thirty leek cultivars [19], where the ascorbic acid concentration range was 90 to 350 mg/100 g d.w. and the polyphenol ranged from 7.3 to 11.3 mg GA/g d.w., whereas the domestic cultivars showed lower polyphenol values, i.e., 3.0 to 5.5 mg GA/g d.w. (Table 2).…”

Section: Antioxidantssupporting

confidence: 80%

Yield, Quality, Antioxidants and Elemental Composition of New Leek Cultivars under Organic or Conventional Systems in a Greenhouse

et al. 2018

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Leek (Allium porrum) is known for its high antioxidant activity and the ability to accumulate significant amounts of potassium and iron. We assessed yield, quality indicators, antioxidants and elemental composition of nine leek cultivars grown in greenhouses under organic or conventional systems in the Moscow region. The management system did not affect yield, which attained the highest value with the cultivar Giraffe and the lowest with Premier and Cazimir. Pseudo-stem dry matter and sugars were higher with organic management, whereas nitrate concentration was higher with conventional management. The cultivars Vesta and Summer Breeze showed the highest dry matter and total sugar content, whereas Goliath had the highest antioxidant, selenium and potassium concentrations. Among the antioxidants, ascorbic acid attained higher values with organic management. The antioxidant system of leek was characterized by highly significant positive correlations between: Se and polyphenols, Se and ascorbic acid, Se and K, ascorbic acid and polyphenols, ascorbic acid and K, polyphenols and K (r = 0.94, 0.94, 0.95, 0.94, 0.95, 0.96, respectively, at P ≤ 0.001). Negative correlations were recorded between leaf and pseudo-stem Se and between leaf and pseudo-stem polyphenols (r = −0.922 and −0.976, respectively, at P ≤ 0.001). Among the mineral elements, only K was significantly affected by the management system, showing a higher content in organically grown pseudo-stems. Varietal differences in pseudo-stem element composition showed strong positive correlations of: Al with As, Co, Li, Pb and V; Cr with I, Mg, Si, Ca; V with As, Co and Fe; negative correlations of Se with Cr and I. Compared to related species such as garlic (A. sativum), leek accumulated levels equal to garlic of K, Mg, P, Cd, Cu, Mn, Se, Zn, lower levels of Si and significantly higher amounts of Ca, Na, Al, As, Cr, Ni, Pb, Sr, V, Sn, B, Co, Fe, I, Li. The strong relationships between quality, antioxidant and mineral components in leek plants may give wide possibilities in breeding programs for both conventional and organic management systems in greenhouses.

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Section: Antioxidantssupporting

confidence: 80%

Yield, Quality, Antioxidants and Elemental Composition of New Leek Cultivars under Organic or Conventional Systems in a Greenhouse

et al. 2018

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“…The larger number of fruits in harvesting stage 1 was probably due to the activation of more flower initiation caused by early fruit harvesting. A similar finding was reported in Zucchini fruits cultivar "Astra" whereby early harvested plants produced large number of fruits than the late harvested ones (Biesiada et al, 2007). Fruits retention on the plant or extension of fruit harvesting interval has been reported to reduce the final total number fruits on mandarin (Munoz-Fambuena et al, 2011).…”

Section: Discussionsupporting

confidence: 66%

Effects of harvesting stages on yield and nutritional quality of African eggplant (<i>Solanum aethiopicum</i> L.) fruits

Msogoya¹,

Majubwa²,

Maerere³

2014

J. App. Bioscience.

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Msogoya et al. J. Appl. Biosci. 2014. Effect of harvesting stages on yield and nutritional quality of African eggplant (Solanum aethiopicum) fruits. ABSTRACT Objective: Farmers often harvest African eggplant (Solanum Aethiopicum L.) fruits at different stages of fruit maturity. The influence of these harvesting practices on fruit productivity and nutritional quality is not known. This study was conducted to determine the effect of harvesting stages on yield and nutritional quality of African eggplant varieties. Methodology and results:The experiment was laid out in a split plot arrangement in a complete randomized block design with three replications. Three African eggplant varieties (Tengeru white, AB2 and Manyire green) and three harvesting stages (1, 2 and 3) were used as main plot factor and sub plot factor, respectively. Harvesting stage 1 (immature fruits) was characterized by fruits with non-shiny peel, harvesting stage 2 (mature fruits) was characterized by fruits with shinny peel and harvesting stage 3 (overmature fruits) was characterized by fruits with yellow coloration at the bottom. Fruit yield was assessed based on number and weight of fruits per plant while fruit nutritional quality was assessed in the laboratory based on carbohydrate, fibres, calcium, potassium, magnesium, phosphorus, iron, β-carotene and ascorbic acid contents. The collected data were subjected to analysis of variance using MSTATC statistical software. Treatments mean separation was conducted based on Student-Newman Keuls at P < 5 %. Results showed that yield in number of fruits per hectare decreased while yield in metric tons per hectare increased with fruit development stages. Varieties Tengeru white and AB2 had the highest yields based on metric tons at harvesting stage 2 while Manyire green had the highest yield at harvesting stage 3. Carbohydrate and fibre contents increased while ascorbic acid, β-carotene and most minerals decreased with fruit development stages. Conclusion and application of results:This study recommends harvesting immature fruits for high vitamin and mineral contents and delayed harvesting for the highest yield. As yield and nutritional quality trends vary with varieties, further studies are required to determine the effect of harvesting stages on yield and nutritional quality of different varieties of African eggplant.

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“…Similar to the data presented in the literature with different vegetable crop species such as leek, kohlrabi, zucchini, pea, eggplant and sweet pepper [Lee et al 1982, Kader 1988, Słociak and Kołota 2002, Gajewski and Arasimowicz 2006, Lester 2006, Biesiada et al 2007, Grzeszczuk 2009, Kołton et al 2011] the important factor influencing the nutritional value of scallop squash was the stage of fruit maturity at the time of harvest. Small size fruits with diameter 3-6 cm, preferred for the food industry, being also in high demand for the fresh market appeared to be a rich source of valuable phytonutrients for human being.…”

Section: Resultssupporting

confidence: 77%

The Effects of Nitrogen Fertilization and Stage of Fruit Maturity at Harvest on Yield and Nutritional Value of Scallop Squash

Balbierz¹,

Kolota²

2017

Acta sci. Pol. Hortorum Cultus

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The aim of the field study was to evaluate the response of scallop squash crop to nitrogen fertilization in the case of cultivation for receiving the fruits with 3-6 cm, 6.1-12 cm or >12 cm in diameter. 'Sunny Delight F 1 ' was grown from seeds and supplied with 60, 120, 180, 120 + 60, 240 or 120 + 60 + 60 kg N•ha -1 . Harvest, which started at the end of June or in early July was conducted with frequency of 2 days, 3-4 days or one week intervals, respectively for small, medium, and large size fruits. Results of the study showed that irrespective of the size of harvested fruits, the maximum mean yield of scallop squash for 3 years was assured by application of 240 kg N•ha -1 , and similar effect was provided by 120 + 60 kg N•ha -1 . Heavy N fertilization was beneficial for the number of fruits setting and early fruit yield, with no change the nutritional value of the crop. Harvest conduced in more advanced stages of fruit maturity increased yields but caused substantial reduction of fruit number from the unit area. Small size fruits with diameter 3-6 cm had the highest nutritional value expressed by the amounts of vitamin C, carotenoids and total polyphenols. Fruits of later stages of maturity contained higher level of total sugar.

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The Effect of Maturity Stage on Nutritional Value of Leek, Zucchini and Kohlrabi

Cited by 16 publications

References 8 publications

Yield, Quality, Antioxidants and Elemental Composition of New Leek Cultivars under Organic or Conventional Systems in a Greenhouse

Yield, Quality, Antioxidants and Elemental Composition of New Leek Cultivars under Organic or Conventional Systems in a Greenhouse

Effects of harvesting stages on yield and nutritional quality of African eggplant (<i>Solanum aethiopicum</i> L.) fruits

The Effects of Nitrogen Fertilization and Stage of Fruit Maturity at Harvest on Yield and Nutritional Value of Scallop Squash

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