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The value losses of cling peaches processed for halves are generated by lower industrial efficiency, by the presence of undesirable attributes, including inadequate maturity level, presence of pit-splitting, and low caliber of units. In order to analyze the effect of fruit size and maturity level on the losses during the pitting and lye peeling, two trials were carried out with Riegels variety peaches. OMIP knife pitters were used, previously separating fruits into three size categories: “small”, “medium” and “large”. The incidence of maturity level in both processes was determined, according to a maturity level grouping: “consistent”, with flesh firmness measured in the fruit cheeks between 7 and 10 Lbf, and “overripe” fruits, with less than 6 Lbf. The percentage losses in the pitting and peeling processes with lye were inversely proportional to the fruit size. During pitting, the overripe fruits suffered greater losses than the consistent ones and in the peeling process with lye, the overripe halves had a greater loss, which was constant, for the three size categories. The results require an exhaustive analysis of the farm-factory interfase and the objective determination of harvest maturity, which mainly defines the quality of raw material and industry efficiency.

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Blackberries are fruits of great commercial value, but at the same time highly fragile and with reduced shelf-life. Their extreme fragility and susceptibility to mechanical deterioration justifies the need to deepen into technological alternatives that allow prolonging their useful life. The use of edible coatings emerges as a promising alternative to preserve the postharvest quality of blackberries. Natural additives such as antimicrobials, antioxidants, firmness agents or bioactive ingredients can be added into them in order to increase safety and maintain the sensory, nutritional and functional characteristics of minimally processed fruits. The objective of this work was to evaluate the quality of blackberries (Rubus fructicosus var Ouchita) from the first harvest (December) and their behavior during the postharvest, after applying chitosan, alginate and alginate coatings with the addition of vanillin, as an alternative to maintain the quality of the fruits. The first stage of the work was carried out analyzing the fruits at the time of harvest and during 14 days of refrigerated storage without the application of coatings, in order to determine their useful life. In addition, physicochemical and nutritional quality parameters (firmness, soluble solids, titratable acidity, ascorbic acid retention, total polyphenols and antioxidant capacity) were evaluated at 0, 4, 7, 11 and 14 days of storage. Microbiological quality, sensory acceptability and fungal deterioration were also evaluated. In a second stage of the experimental design, the blackberries were treated with different edible coatings and stored under refrigeration (5ºC) to determine their useful life, performing the previously detailed determinations. The results obtained indicated that active edible coatings could be considered as a potential alternative for postharvest preservation that allows maintaining the quality attributes of blackberries and prolonging their marketing period; however, even more research is required to be able to be transferred to fruit and vegetable producers.

PDF 456.7 KB (114 downloads)

Squash in Argentina is a vegetable of great economic, social and nutritional importance, it is among the vegetables with the highest levels of consumption and it is consumed in every social stratum and at all ages. The objective of the study was to determine the natural growth rate, commercial yield, and quality of commercial fruits for plants that were developed after cover crops and extended fallow periods. The study was conducted in a soil known as Petrocalcic Paleustol, located in the semi-arid region of the rocky plain in southern La Pampa, Argentina. For two consecutive seasons, rye, rye and vicia, and fallow without cover crops were planted as cover treatments in the same plot. Each cover treatment was implemented using two methods: rolling andherbicide growth stoppage.In this way, six management treatments for squash cultivation were performed. The results after two consecutive seasons showed that the plants developed under cover crop treatments prior to cultivation, along with conventional weed control management, presented the highest values of natural growth rate, achieving excellent coverage of the sowing area. The highest commercial yields were obtained with prior rye cover treated with herbicide growth stoppage, and with rolled rye-vicia cover, for the first and second seasons respectively. The shape of the commercial fruits was not affected by any treatment. All crops with prior coverage had a positive effect on small and medium sizes,which are the most preferred fruit sizes by the domestic market.

PDF 743.1 KB (66 downloads)

Spinach is characterized by having a high water content and different vitamins and minerals. However, this vegetable could have high oxalate and nitrate concentrations and can affect human health if consumed.The aim of this study was to evaluate the nitrogen fertilization effect on the yield, nitrate and oxalic acid content of spinach produced in an autumn-winter cycle under different growing systems. Spinach was grown in soil in a greenhouse and in an open field at the experimental field of the Faculty of Agronomy of the University of Buenos Aires. Soil treatments were 0.50 and 100 kg N.ha-1. Another culture was in substrate (perlite) where nitrogen supply restriction was applied 15 days before harvest. Color, leaf area, harvest index, yield, nitrate and oxalic acid levels were determined for each crop at harvest. Leaves were selected and 60 g were packaged in 31 micron polyolefin bags. Bags were stored in a refrigerated chamber at 5 ºC for 9 days. The nitrate and oxalic acid content of spinachwas also determined at the end of the storage period. Yield and leaf area were higher with 100 kg N.ha-1 without differences between greenhouse and open field. Oxalate content was higher in spinach from the open field, showing the highest value in the case of 100 kg N added, without changes at the end of postharvest period. The maximum nitrate content was 2.7 in greenhouse with 100 kg N.ha-1. The nitrogen restriction reduced the commercial yield, oxalic acid and nitrate content at harvest in perlite. The difference was maintained postharvest, except for the nitrate content.

PDF 1.1 MB (177 downloads)

Food quality studies are important to verify authenticity and investigate foreign matter. The objective of this work focused on applying the characters of diagnostic value of the fruits of papaya, fig, mango and tree tomato, for botanical quality control and comparing the labeling of derived products with current legislation. 23 products (industrial and artisanal) acquired in San Salvador de Jujuy were analyzed using scraping micrographic techniques, mild dissociation and combined histochemical reactions. Diagnostic characters (polygonal epidermal cells, tecting hairs, glandular hairs, fibers, sclereids, crystals, laticiferous tubes, starch grains, lipid droplets and seminal hairs) were identified in jams, jelly, sweets, chutney, artisanal wine, candied foods and fig coffee which confirm the presence of the raw material, in correspondence with the specifications of the Argentine Food Code (Chapter V). Of the industrial products, 70% were genuine and 30% were contaminated, while in artisanal products, 92% were genuine and 8% were contaminated. Regarding labeling, 70% of the industrial products met the specifications and 30% did not. On the other hand, only 31% of the artisanal products met the specifications, while the remaining 69% did not. The micrographic method constitutes a reliable strategy to confirm the added value that said quality implies in local preparations in the province of Jujuy.

PDF 701.8 KB (105 downloads)

In the production of aromatic-condiment seedlings, it is common to use less renewable substrates, such as peat, "black earth" or "mulch". To verify their replacement with a more sustainable substrate, the use of a bioestabilized residue (RB) based on household waste rich in yerba mate (Ilex paraguariensis) was evaluated as substrate in basilicum (Ocimum basilicum) seedlings. RB was obtained by treating mixtures of household waste from yerba mate, in a 70/30 proportion with remains of fruits and vegetables, in aerated containers that were weekly mixed. After 120 days of the process, the RB was sifted and its physicochemical properties and effects on basil seedlings were evaluated. Five treatments (T) were established with different combinations of MB and a commercial substrate (SC): T1: 100% SC; T2: 75% SC+ 25% RB; T3: 50% SC + 50% RB; T4: 25% SC + 75% RB and T5: 100% RB. Each treatment consisted of 3 repetitions with 24 sample plants each. The germinative power, plant height and root length were significantly reduced in T5. The height of plants and number of leaves were significantly higher in T3 and T4. In all the combinations of components (T2, T3, T4) the highest fresh and dry mass of the aerial part, and the fresh mass of the whole plant were found with respect to T1.The T4 presented the highest dry mass of the aerial part. The RB was suitable as a substrate component in basil plantations.

PDF 908 KB (475 downloads)

Broccoli, Brassica oleraceaL. var. italicPlenck, belonging to the Brassica family, are known for their nutritional health benefits, as they contain bioactive compounds that could reduce cardiovascular, neurological or cancer risk. The demand has been growing in recent decades and is expected to continue in the coming years. Due to its growing popularity, considerable research is focused on different production topics. The main objective of this review is to update the information on broccoli related to the market, genetic improvement, crop management, postharvest and recycling of crop residues. Most of the articles focus on two topics: the functional value of broccoli in human health and the sustainable approach in the production chain. In the first, pre- and post-harvest factors are evaluated to obtain the maximum of bioactive compounds, in the second, new post-harvest practices are developed to minimize losses and new alternatives are proposed for the recycling of harvest and processing residues. Genetic breeding is being used to incorporate pest and disease resistance genes, and more stable cultivars to use in organic management systems. Very few studies arefocused on crop management and those are referred to the efficient water and soil use. It will be necessary to maximize efficiency in all links of the production chain in order to reduce the impact on climate change indicators.

PDF 1.3 MB (314 downloads)

Rhaphithamnus spinosus is an evergreen, thorny shrub with violet flowers and violet colored nucleus fruit; endemic from the north of the Andean Patagonian forest. Previous works indicate that the seeds have a physiological and mechanical dormancy in their fruit. The objective was to evaluate the methods for sexual and asexual propagation of the species. The viability of the seeds was analyzed with a germination and 2,3,5-triphenyltetrazolium tests. Four pre-germination treatments were tested: T1: Cold-wet stratification for 60 days, (T2): Scarification with sandpaper + cold-wet stratification-60 days, T3: Scarification with sandpaper + soak 1000 ppm gibberellic acid (GA3) for 24 hs and T4: Scarification with sandpaper + soak water / 24 hs as a control in two seed samples. Seeds were sown at 18 °C, with a photoperiod of 12 hours and subsequently sown in a multicell tray. The agamic method consisted in hardwood cuttings that were cut during autumn, and placed in multicell trays, treated with a 1500 ppm indole-3-butyric acid (IBA) solution, with basal heating (20 ºC±2) and mist. In sexual propagation, the germination percentages per treatment were: T1: 4.81 %, T2: 6.29 %, T3: 47.78 % and T4: 2.59 %. Growth in height and ramifications were analyzed. Asexual propagation reached 96 % rooting at 90 days, and plants were then transferred to 3 L pots. It is concluded that the application of combined pre-germination treatments improves the germination percentage. These resultssuggest the possibilityfor professional propagation and container cultivation.

Study of Latin American consumption of local fruit and vegetables “0 Km”

ADVANCES IN HORTICULTURE - REVIEW | Castagnino, A.M. - Díaz, K.E. - Marina, J.A. - Fernándes, C. - Díaz, H. - Bazán, P.L. - Rogers, W.J. - Rubel, I. - Otaño, A.C. - Fasciglione, G. - Marín Castro, M.A. - Reina, R. - Galizio, R. - Cendón, M.L. - Zanelli, G. - Miranda Lasprilla, D. - Chaparro, G.M.P. - Pérez, E.F. - Yommi, A. - Bastien, E.

Tags: differentiation, packaging, Good Agricultural Practices, prosumers, feeding

PDF 1.1 MB (262 downloads)

Horticulture, with its different disciplines (Horticulture/Olericulture, Fruit-growing, Aromatic-Medicinal and Floriculture), has become more relevant, since the Covid-19 pandemic, with a greater appreciation of products from short chains. The objective was to evaluate the degree of knowledge, behavior and preferences of Latin American consumers, regarding the safety, quality and origin of local fruits and vegetables (F&H) produced and consumed within a radius of no more than 100 km, differentiated with the “Km 0” logo. An online survey was generated (GoogleForms): Study on the Latin American production and consumption of "Km 0" fruits and vegetables, within the framework of inter-institutional links (UNCPBA, UNMDP, UNSL, UCA and INTA CERBAS Area, from Argentina; UdelaR, Uruguay; UNAL and UniSalle, Colombia; BUAP, Mexico; UFRRJ, Brazil), from 03/09/2022 to 07/12/2022. The main topics were: Degree of knowledge of the F&H category “Km 0”; Perceived benefits; Predisposition to consume and acquire them; Degree of evaluation of the “Km 0” labelling; and dissemination campaigns; Places of purchase and changes since the pandemic; Valuation of having lists of local producers of F&H “Km 0”; Knowledge of the place of production of the F&H and assessment of the promotion of local productions; Knowledge of GAP; Acquired food and Assessment of the origin of F&H consumed. The surveys answered were 1127. Ignorance of the “Km 0” category was detected (60%), low consumption of F&H (17% consume 5 ≥ portions/day) although there is a high assessment of F&H in the diet (80%). The need for permanent training and dissemination, of the production and consumption of safe and quality F&H, in quantity and diversity, was evidenced. The pandemic was a turning point from which consumers became aware of the importance of the origin of the products consumed, preferring local F&H.

PDF 481.7 KB (388 downloads)

This research was carried out in the city of Asunción Central Department - Paraguay in the Mburukuya neighborhood, whose georeferenced coordinate is 25°18'00'S 57°38'00''W . The objective of the work was to evaluate the effect of a biostimulant on the yield of the lettuce cv. ‘Verenada’ in a hydroponic system. The experimental design used was completely random and had three treatments and four repetitions with a total of 120 plants per treatment. It was concluded that there is an influence with the use of biostimulant on the variables studied. Regarding the height and weight of the plant, the treatments T1 (one application) and T2 (two applications) were the ones that presented the highest values. Treatment T1 (one application) presented a greater number of lettuce plant leaves. Regarding root weight, there was no statistical difference between treatments.