Search

Search Results

• Supplemental Effects of Self-extracted Organic Nutrient Solution on the Growth and Yied of Water Spinach (Ipomoea Aquatic F.) in an Aquaponic System

  Nguyen Thi Ai Nghia, Nguyen Thi Ngoc Dinh, Nguyen Hong Hanh, Do Thi Huong

  Received: Dec 06, 2021 / Accepted: Sep 22, 2022 / Published: Sep 30, 2022

   Abstract PDF

  Aquaponics combines two technologies, recirculating aquaculture systems and hydroponics in a closed system. The nutrients recycled from fish tanks supply nutrients for vegetables grown in hydroponics, however in some cases, the nutrient levels may not be sufficient for the optimal growth and yield of plants. In this study, two experiments were conducted to understand the effects of supplemental organic nutrient solutions on plant growth and yield in climbing perch-water spinach aquaponics. Experiment 1 (Exp.1) was conducted to evaluate the effects of three types of leaf-based organic fertilizers on the growth and yield of water spinach, namely self-extracted organic nutrient solution (OE), and two popular commercial foliar organic fertilizers, Hydro Fulvic (OF1) and TCN HUME (OF2), with the dose of 1%. Exp.1 showed that supplementation with the self-extracted solution significantly increased the growth and yield of water spinach but did not change the quality of water spinach in terms of the Brix values and nitrate residue content compared to the control. However, the self-extracted solution showed less effectiveness than the two commercial fertilizers in this experiment. Therefore, we conducted experiment 2 (Exp.2) to determine the suitable concentration and potential use of this extract for water spinach in aquaponics. The results of Exp.2 indicated that the concentration of 2% was the most economical and effective to provide supplemental nutrients for water spinach in the climbing perch-water spinach system. The study suggests that self-extracted organic nutrient solutions can be effectively used for growing water spinach in aquaponic systems.

• Determination of Optimal Levels of Energy, Protein, and Fiber in the Diets of New Zealand White Growing Rabbits Based on Nutrient-Response Models

  Nguyen Xuan Trach, Tran Hiep, Nguyen Thi Duong Huyen, Nguyen Van Dat

  Received: Jan 09, 2019 / Published: Jun 06, 2019

   Abstract PDF

  A study was conducted to estimate the optimal levels of energy, protein, and fiber in the diets of New Zealand White (NZW) growing rabbits fed on fresh green forage available in North Vietnam. Mathematical modelling of nutrient-response curves was applied for the study. A total of 125 male growing rabbits at 6 weeks of age were randomly divided into 25 groups of 5 each to be fed on diets with an array of different levels of metabolizable energy (ME), crude protein (CP), and acid detergent fiber (ADF) by means of varying the ratio between fiber rich grasses, viz. elephant grass (Pennisetum purpureum), Setaria grass (Setaria sphacelata), or Para grass (Brachiaria mutica), and protein rich forages, viz. water spinach (Ipomoea aquatica) vines, sweet potato (Ipomoea batatas) vines, or Trichantera leaves (Trichanthera gigantea), in the basal diets. The average daily gain (ADG) and feed conversion ratio (FCR) were used as key responses of the rabbits to varied levels of ME, CP, and ADF in the diets. The results showed that the levels of ME, CP, and ADF in the diets strongly affected the ADG and FCR of the rabbits following curvilinear patterns with the highest ADG and lowest FCR when the diet contained 2106-2162 Kcal ME kg-1 DM with 16.5-16.8% CP and 21.9-22.4% ADF. Therefore, these levels of nutrients were considered to be optimal in the diets of NZW growing rabbits fed on local forages.

• Effects of Packaging Materials and Disinfectants on Quality Changes of Ceylon Spinach (Basella alba L.) during Storage

  Tong Thi Anh Ngoc, Phan Thi Thanh Que

  Received: Mar 11, 2019 / Published: Aug 30, 2019

   Abstract PDF

  Minimally processed fruits and vegetables are economically important commodities due to convenience, and healthiness, etc. These commodities are susceptible and shelf life limited as cut surfaces of vegetable result in microbiological and physiological spoilage. To extend the shelf life of Asian spinach vegetables, different washing treatments (i.e. tap water, chlorine dioxide, and peracetic acid) and packaging materials (i.e. Polypropylene-PP, High Density Polyethylene-HDPE and Low Density Polyethylene-LDPE) were evaluated in the study. The results obtained show that washing treatment of the Asian spinach with peracetic acid solution of 100 ppm for five minutes was effective due to reduced significantly E. coli and Coliforms counts. The Asian spinach was packed in HDPE material might optimally prolong the shelf life up to 7 days at 10±1oC.

• The Effects of Vermicompost Leachate from Different Composting Materials on Growth and Yield of Cucumber

  Thu Thieu Thi Phong, Nguyen Anh Tuan, Nguyen Van Giang

  Received: Apr 17, 2026 / Accepted: Aug 08, 2026 / Published: Sep 30, 2026

   Abstract PDF

  This study aimed to identify suitable composting materials for producing high-quality vermicompost leachate (VL) and to evaluate its effects on cucumber plants. The research consisted of two experiments. The experiment 1 investigated the effects of composting materials on vermicomposting efficiency. The experiment 2 evaluated the effects of VL concentrations on the growth and yield of cucumber. The experiment 1 consisted of three composting treatments using different substrates, namely cow manure combined with water spinach, household organic waste, and coatbutton flowers (Bidens pilosa L.). The results showed that the treatment using cow manure combined with water spinach (VL1) had the best performance, generating VL with the highest electrical conductivity (EC) (1958 µS cm-¹) and the greatest number of adult earthworms after composting (494 individuals). The experiment 2 using VL1-VL included treatments of C0-1 (applied water only, NF), C0-2 (applied fertilizer according to the recommended cultivation protocol, CF), C1 (applied 10% VL), C2 (applied 15% VL), and C3 (applied 20% VL). The results showed that increasing the concentration of the VL1 vermicompost leachate significantly improved growth parameters, including plant height, stem diameter, leaf area, dry biomass, and yield. Notably, the treatment with 20% VL1-VL produced growth and yield values comparable to the control treatment using 100% chemical fertilizer. These findings contribute to promoting the conversion of agricultural by-products into useful inputs for crop production, thereby helping to reduce organic waste and environmental pollution.