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• Hot Water Treatment and Carrageenan Coating Slow Postharvest Ripening and Deterioration of ‘Tieu Hong’ Banana

  Nguyen Thi Hanh, Nguyen Thi Hoa

  Date Received: 21-04-2025 / Date Accepted: 17-09-2025 / Date Published: 30-09-2025

   Abstract PDF (VIETNAMESE)

  The ‘tieu hong’ banana is a tropical fruit with large production in Vietnam but post-harvest preservation is facing many difficulties and there is no effective solution. This study aimed to evaluate the effects of hot water treatment combined with carrageenan coating on the maintenaceof the quality of the banana. Bananas were treated with four methods: untreated control, hot water treatment at 47°C for 10 minutes, 0.5% carrageenan coating, and combined treatment. The parameters investigated included weight loss, colour, total soluble solids, chlorophyll a, phenolic content, DPPH antioxidant activity of the fruit flesh and peel, and the disease incidence and severity. The results show that hot water treatment combined with carrageenan coating helped reduce weight loss, maintain colour and chlorophyll content in the fruit peel, slow down the change in total soluble solids, and enhance phenolic content and antioxidant capacity in both fruit flesh and peel compared to other treatments. This method also helped significantly reduce the incidence and severity of banana disease. Hot water treatment combined with carrageenan coating showed effectiveness in slowing down the postharvest ripening process and decreasing the deterioration in ‘tieu hong’ bananas.

  DOI: https://doi.org/10.31817/tckhnnvn.2025.23.9.08

• Effect of Slow-Release Fertilizers on Growth, Development and Yield of NK66 Hybrid Maize in Bat Xat District, Lao CaiProvince

  Nguyen Thi Lan Anh, Nguyen The Hung, Tran Thi Thiem, Nguyen Tat Canh

  Date Received: 19-03-2018 / Date Accepted: 05-06-2018

   Abstract PDF (VIETNAMESE)

  The effect of slow-release fertilizers(SRF) on growth, development and yield of NK66 hybrid maize was studied in 2013 and 2014springcropping seasons, in Bat Xat district, Lao Cai province. The effect of different types of SRFproduced by using organic polimer and nitrogen release inhibitorwere comparedwith common chemical fertilizer (nitrogen, phosphorous and potassium). All treatments were applied with 110N + 60P2O5 + 57K2O per hectare. The experiment was arranged in a randomized complete block design (RCBD) with three replicationsanf the corn variety was NK66 planted at density of 57,000/ha. The study results showed that the SRF application has positive effect on growthanddevelopment of corn. Grain yield varried from 6,803 ton/ha to 7,975 ton/haand SRF with coating polymer and plant extract had the highest yield.

• Effect of Slow-Released Nitrogenous Fertilizer with Polymer Coating on Growth and Yield of Maize in Spring Season in Gia Lam - Hanoi

  Nguyen Van Phu, Nguyen The Hung, Nguyen Tat Canh, Dinh Thai Hoang

  Date Received: 12-01-2012 / Date Accepted: 19-04-2012 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  This experiment was carried out in 2011 Spring season to evaluate the effect of polymer-coated, slow-released nitrogen fertilizer on growth and yield of maize grown on Red River alluvial soil at Gia Lam, Hanoi. Four doses of slow-released fertilizer, viz. 150 kg N/ha, 120 kg N/ha, 90 kg N/ha and 60 kg N/ha were used to compare with the conventional broacasting practice as control (150 kg N/ha). The results showed that doses of  90 – 150 kg N ha-1 of slow-released N fertilizer resulted in better growth and higher yield (yield increase by 4.8 – 10.8%). It was suggested that for maize cultivar LVN4 90 kg of slow-released N formulation be applied for in spring season for highest yield and economic efficiency.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.2.

• Enhancing the Antimicrobial Activity of Pectin-Alginate Biofilm and its Application in Preservation of Fresh Passion Fruits (Passiflora edulisSims)

  Nguyen Trong Thang, Nguyen Thi Thu Nga, Hoang Thi Minh Nguyet, Nguyen Thi Bich Thuy

  Date Received: 28-03-2022 / Date Accepted: 21-10-2022

   Abstract PDF (VIETNAMESE)

  The present study was aimed to enhance the antimicrobial activity of Pec-Alg film-forming solution. Nanobubbles (NBs), cinnamon essential oil (Cinna) and chlorine (Chlo) were three potential substances added to Pec-Alg solutions. The microbial inhibitory effect was evaluated in vitro, and the Pec-Alg solutions were directly applied to passion fruits to evaluate the antimicrobial effect, the rate of disease transmission during storage, and the quality changes of passion fruit through physiological, mechanical and biochemical parameters. The results showed that the solutions of Pec-Alg supplemented with NBs or Cinna or Chlo all had high inhibitory effect in vitro conditions with 86.7%, 74.1% and 93.6%, respectively. Moreover, they had a positive inhibitory effect on microorganisms on passion fruits in the following order: Pec-Alg-Chlo > Pec-Alg-NBs > Pec-Alg-Cinna, of which Pec-Alg-Chlo solution had the highest inhibitory effect, reaching 84.4% at 1 hour after coating and 43.6% after 30 days of storage.They were also significantly effective to limit the rate of disease transmission during storage, contributing to prolong the shelf life of passion fruits up to 33 days, which means an increase of 15 days compared to the control and an increase of 9 days compared to Pec-Alg coating without addition ofany antimicrobial agents.

• Effects of Postharvest Treatment by Propionic Acid in Combination with Wax Coating onQuality of Purple Passion Fruit (Passiflora edulisSims.) 

  Le Ha Hai, Nguyen Sang

  Date Received: 05-04-2021 / Date Accepted: 04-06-2021

   Abstract PDF (VIETNAMESE)

  The research aimedto identify the concentration effects of propionic acid (AP) combined with a membrane coated with a mixture of beeswax and carnauba wax (MW) at a concentration of 8% on quality and storage time of postharvest purple passion fruit. After being washed and left to dry, the fruits were dipped in AP solution0.25; 0.35; and 0.45% for 10 minutes.After being left to dry again, the fruits were coated with 8% MW. After continuing to be left to dry, the fruits were placed in a foam tray put in carton boxes and stored at 5 ± 1°C, RH = 85 ± 2%. The untreated fruits and uncoated fruits were used as controls. The respiration rate, the percentage of weight loss, the total soluble solids (TSS) content, the total titrable acidity(TTA) and vitamin C content, the total microorganism population on the surface of the fruits and the percentage of fruits decay were analyzed and evaluated throughout the storage period. Research results showed that AP at a concentration of 0.45% combined with8% MW coating (CT3) is the best treatment for reducing the respiration rate, the total microorganism population on the surface of the fruits, the percentage of fruits decay and weight loss, slowly reduced TSS, TTA and vitamin C content. After 42 days in storage purple passion fruit treated by CT3 had the percentage of general loss including weight loss and decay is 11.9% in comparison with the control sample had the percentage of general loss is 96.2%.