Quality Of Vegetable Products Research Articles

Research on Automated Pricing and Supplementation Decision-making of Vegetable Products

In fresh supermarkets, the shelf life of vegetable products is usually very short, so it is crucial to replenish inventory daily based on historical sales data and product line requirements. In order to strengthen decision-making and inventory management, this article first selects representative supermarket sales data and conducts appropriate preprocessing, and then adopts a series of effective analysis methods. Firstly, using Kappa consistency testing to explore the correlation between different vegetable categories can help determine which products may be correlated in sales. In addition, in order to better formulate pricing and replenishment strategies for vegetable products, this article introduces a cost-plus pricing model. When determining the markup coefficient, multiple linear regression was used to ensure that the price-setting process is reasonable and consistent with cost and demand. In order to further confirm the accuracy and feasibility of this method, the article calculated the R-squared value of multiple linear regression, which reached 0.975, providing strong validation for the effectiveness of this method. When formulating replenishment strategies, in order to obtain sales forecasts for vegetable categories within the next 7 days, this article also uses a seasonal ARIMA model, which helps supermarkets plan inventory and supply chain more effectively. These strengthening measures have jointly improved the decision-making ability of vegetable product management in supermarkets, promoted more effective data-driven strategies, ensured the freshness and quality of vegetable products, and maximized the economic benefits of supermarkets.

Harmonization of national quality standards to European as a mechanism for improving the competitiveness of vegetable products

The article has already analyzed the problem of ensuring the competitiveness of vegetable products in the European market. We have already revealed the need to integrate EU quality standards into Ukrainian legislation. It was determined that one of the mechanisms for increasing the competitiveness of vegetable products is the harmonization of national quality standards with European ones. The aim of work - to reveal the existing problems regarding the quality of vegetable products, to justify the need to integrate EU standards into Ukrainian legislation, to give a comparative description of the quality standards of fresh vegetables in Ukraine and the EU. The quality standards for fresh vegetables in Ukraine and the EU countries are now being analyzed in the context of our country's aspiration to join this organization. In Ukraine, the quality of fresh vegetables is established by national standards (DSTU), as well as harmonized with European ones (DSTU UNECE FFV). Presented were the comparative characteristics of the quality requirements for fresh cabbage, carrots and onions. On the basis of the analysis, obvious differences between national standards and those harmonized with European quality standards for vegetables were outlined. Conclusions. Consequently, the harmonization of national quality standards with European ones is one of the mechanisms for increasing the competitiveness of Ukrainian vegetable products in the European market. From the examples given earlier, common and opposite features of the classification of product standards in Ukraine and the EU countries, an analysis of domestic and foreign regulatory and technical documentation for fresh vegetables, it was found that the quality of vegetable products was assessed according to the same organoleptic properties (appearance, shape requirements, dimensions products, color, taste, smell), as well as physicochemical (content of harmful substances), contained requirements for packaging, labeling, transportation and storage, but there were differences in the norms of individual indicators. In addition, the EU marketing standards do not contain storage requirements, as it is mandatory for the manufacturer/seller. Ukrainian standards for fresh white cabbage, carrots and onions set maximum levels for heavy metals like lead, cadmium, mercury, copper, zinc. For EU producers, maximum levels of pollutants have been given in separate EU regulations. Keywords: fresh vegetables, quality, harmonization, marketing standard, national standard, white cabbage, onion, carrots.

Yeast biomass production with potential for biological control: process strategies for increasing yield

The quality of vegetable products is directly linked to the techniques used in the field, in order to ensure safe and healthy products to health. In this context, the use of yeasts with potential for biological control proved to be a promising alternative to assure the safety of these foods. Fermentation processes have been used to promote the development of many products, including the production of yeast biomass. The objective of this work was to verify the influence of the aeration rate and the fed batch process in the production of yeast biomass. A yeast strain with biological control potential, belonging to Embrapa's Semi-Arid crop collection, was subjected to simple batch cultivation and fed with different aeration rates (3, 4, 6 and 8 L.ar/min) and concentration of carbon source in the feed medium (200, 400 and 600 g/L). The highest biomass (6.99 g/L) after 24 hours of fermentation was observed in the experiment that used an aeration rate of 8 L.ar/min. Regarding the concentration of the carbon source in the feed medium, it was found that the concentration of 200 g/L favored a greater total biomass (11.21 g/L) and reduced the production of ethanol (0.65 g/L ), while the concentration of 600 g/L favored less biomass production (7.90 g/L) and higher ethanol production (9.26 g/L). Thus, it was found that the aeration rate and the fed batch process favor the fermentation strategy, as they contribute to the production of yeast biomass and the overall yield of the process.

Assessment of quality of vegetable products according to electric characteristics

Р озроблено методику та структуру вимірювального засобу для дослідження впливу концентрації мінеральних речовин в модельній рідині (овочевому соці) на складові її електропровідності. Досліджено залежність електричних властивостей овочевого соку з вмістом іонів натрію та міді від концентрації цих речовин у модельній рідині. Опрацьовано отримані експериментальні дослідження зміни активної і реактивної складових провідності (адміттансу) та подано рекомендації щодо оперативного контролю якості овочів.

The Evaluation of Yield Potential and Quality of Fruits at Tomato Hybrids Cultivated in Greenhouse

The selection of hybrids with good yield potential has great importance in greenhouse tomatoes culture in order to improve the economic efficiency of this crop. Consumer interest in the quality of vegetable products also increased in the last years. In this experiment six tomato hybrids for fresh consumption recommended for greenhouse culture were evaluated as yield potential and quality of fruits. The evaluation of tomato fruits quality included appearance, firmness and chemical composition. The highest early and total yields were obtained in Menhir F1, Shanon F1 and Monroe F1 and the best fruit quality in Monroe F1, Tolstoi F1 and Cronos F1.

Do soilless culture systems have an influence on product quality of vegetables

Summary In the horticulture industry, the focus has traditionally been on yield. However, consumers’ interest worldwide in the quality of horticultural products has increased in the recent past and will become the driving force in the future. Soilless culture systems (SCSs), the most intensive production method in today’s horticulture industry, are based on environmentally friendly technology, which can result in higher yields, even in areas with adverse growing conditions. However, using SCSs does not automatically result in the production of high-quality vegetables. Numerous studies confirm that a SCS enables growers to produce vegetables without quality losses compared to soil cultivation. An adaptation of cultural management to the specific cultural system, as well as crop demand, can further result in the improvement of the quality of horticultural products.

The Influence of Fertilization on Greenhouse Tomatoes Cultivated in Peat Bags System

Important factors to be considered for growing tomatoes in order to obtain high and safety yield are variety, system of culture and fertilization. To establish how the fertilization managing can influence both yield and quality of greenhouse tomatoes grown on peat bags system, different doses and types of fertilization (basic and additional) were studied in this experiment. Two Dutch cultivars (Cronos F1 and Menhir F1) with high yield potential were used. Cronos F1 recorded the best early yield (5.87 kg·m -2 ) and Menhir F1 the best total yield (13.06 kg·m -2 ). Foliar fertilization, done with a high K ratio fertilizer (10:5:26), once weekly applied, determined distinct significant efficiencies of early yield and significant efficiencies of total yield. Vitamin C, acidity and total sugar content in the fruit increase with foliar fertilization. None of the nitrate or nitrite values over passed the accepted limits of permission for greenhouse tomatoes. Greenhouse tomatoes grown on peat bags system allows to increase early and total yield in comparison with conventional crop in soil. Because bags contain only a small volume of growth medium, they offer much lower water holding capacity and much lower buffering capacity than most soils regarding both major and minor elements. Therefore it is necessary to monitor continually the nutrient availability in the substrate and to adjust accordingly the composition of feed applied to it. The quantity of nutrients which should be applied also depends on the yield potential of the cultivar and growth conditions. Tomatoes need a continuous and steady supply of nutrients through additional fertilization throughout their life cycle because their vegetative and reproductive stages overlap. Since many experiments have not revealed real differences between the product quality of vegetables grown in soil or hydroponically (Schnitzler and Gruda, 2003) soilless culture in greenhouse may be an alternative to soil culture for high-value vegetable crops including tomatoes. Better tomato fruit quality can be obtained by fertilization measures such as an increase in the concentration of the nutrient solution, or a reduction of nitrate application rates. It is also necessary to adopt appropriate nutrient management practices (use of slow- release fertilizers, split applications, combining of radicular and foliar fertilization) which help to supply nutrients in adequate quantities to just meet crop demand and minimize losses, thus increasing the nutrient use efficiency. The objective of the present study was to evaluate two greenhouse tomato hybrids grown in bags on organic substrate (mostly composed from brown peat) in order to establish how fertilization managing can influence yield and chemical properties of fruit.

Impact of Environmental Factors on Product Quality of Greenhouse Vegetables for Fresh Consumption

Consumer interest worldwide in the quality of vegetable products has increased in recent years. Product quality is a complex issue. As well as visual characteristics, properties such as texture, the content of minerals and vitamins, flavor and other organoleptic characteristics must be considered. In addition, new knowledge shows that vegetables are appreciated for their beneficial health effects in humans and underlines the importance of nutraceutic properties. Many research studies have documented methods for achieving a high-quality vegetable product. Indoor production for fresh vegetables offers advantages compared to outdoor production with regard to quality assurance principally, because the products are not exposed directly to the rapid changes of climate conditions. On the other hand, vegetable cultivation in a greenhouse under artificially created conditions also affects the internal quality of the product. This is reflected in a different taste and flavor compared with field vegetables. Changes in external as well internal quality attributes of greenhouse vegetables subjected to light intensity, temperature, vapor pressure deficit (VPD), and CO2 enrichment of the atmosphere concentration are discussed in this paper. Referee: Dr. J. M. White, Vegetable Production Specialist, Mid-Florida Research and Education Center, UF/IFAS, 2725 Binion Road, Apopka, FL 32703, USA

QUALITY ISSUES OF GREENHOUSE PRODUCTION

Today, the orientation in horticulture world wide is geared to quality instead of quantity. Many experiments have not revealed any real differences between the product quality of vegetables grown in natural soil or hydroponically in soilless culture. However, horticultural production in many hydroponic systems is environmentally friendly, does allow the possibility of improved yields and also provides better direct inputs for quality management technologies with precise adaptations to specific conditions of the system or substrate. High yields do not automatically imply high quality, therefore a compromise between both needs to be established. The aim is to produce high quantities of valuable products that fit the expectations of producers, traders and consumers. Better quality can be obtained by direct measures, such as an increase in the concentration of the nutrient solution, or a reduction of nitrate application rates in vegetables, or via indirect measures to use threshold levels for growth factors, including macro- and micro- nutrient concentrations, or the introduction of beneficial microorganisms to improve the environment in the rhizosphere assisting plant production.