Search

Search Results

• Treatment of Mushroom Culture Wastes for Use as Organic Substrate for Safe Vegetable Cultivation

  Nguyen Thi Minh

  Received: 20-10-2015 / Accepted: 20-11-2016

   Abstract PDF (VIETNAMESE)

  The purpose of this research was to apply micro-biotechnology to treat mushrooms culture wastes to produce organic substrate for safe vegetable production in order to efficiently recycle the organic waste resources and increase the value for mushroom growing towards sustainable agricultural development and environmental protection. Five microbial strains, including Azotobacter, Bacilus subtilis, Sacharomyces, Streptomyces and Trichoderma with high amylase, protease and cellulase and biological activities were used as biological formulation for treating the mushroom culture wastes. Results obtained indicated that the organic substrate after treatment had high nutrient content and high density of useful microorganisms that ensure the growth and development of vegetables without other additional costs. Ceylon spinach grown on organic substrate showed better growth, significant yield increase and reduced insect infestation rate. Moreover, the vegetables grown on the substrate from treatment of mushroom wastes possessed high quality standards for safe vegetables conforming to the Decision No. 106/2007/QD-BNNPTNN.

• Effects of Nitrogen, Phosphorus and Potassium Levelson Tomato Grown on Organic Substrate

  Nguyen Van Thao, Nguyen Thu Ha, Do Nguyen Hai

  Received: 21-04-2016 / Accepted: 15-07-2016

   Abstract PDF (VIETNAMESE)

  Nutrient supply to plants grown on substrate is necessary to obtain high product quality and yield. The objective of the present study was to determine the suitable amount of N, P, K fertilizers for tomato grown on organic substrate. The experiment consisted of 28 pots that were applied with different fertilizer levels. Study results show that pHKCl of organic substrate was neutral (7.28), total nitrogen, phosphorus and potassium were high and equivalent to some popular organic substrates. Different levels of phosphate, potassium fertilizer application (with the same level of nitrogen fertilizer) did not affect tomato yield. Combination of 6.0 g N, 4.5 g P2O5 and 6.0 g K2O per pot improved average fruit weight (78.32 g/fruit) and actual fruit yield (2.38 kg fruit/pot). Potassium fertilizer application significantly affected sugar content of tomatoes (> 5.0%) in pots applied with 4.0 - 6.0 g K2O. After 15 days of fertilization, NO3- content of the tomatoes fluctuated between from 29.7 to 110.3 mg/kg fruit which was lower than VietGap standard.

• EffectofFly Ash on Organic Substrates andGrowth ofGerbera jamesonii

  Nguyen Thi Minh, Nguyen Tu Diep, Pham Minh Hieu

  Received: 12-06-2023 / Accepted: 07-03-2024

   Abstract PDF (VIETNAMESE)

  The purpose of this study was to determinethe effect offly ash ontheorganic substratesfor growing flower and ornamental plants in order to effectivelyreuse theagricultural and industrialwaste sources. The fly ash was added into rawmaterials toproduce organic substrate at different rates: 5%, 10%, 15% and 20% and incubated by the semi-aerobic method. The results indicated that the organic substrate from agricultural by-products supplemented with fly ash had goodnutritional content, limited presence of E. coliand Salmonella, withneutral pH, and acceptable heavy metal content(notexceeding QCVN 03-MT:2015/BTNMT standard) that ensures the growth and development of flowersand ornamentalplants. The experiment of growing Gerbera jamesoniion organic substrates supplemented with fly ash showed a cleareffect on growth rate, harvested yield, and the number of flowers harvested in the treatment supplemented with 15% fly ash with 1.75 flowers higher than the control without fly ash supplement 40%. Thefly ash rate of 10-15% appeared as appropriate range to add to the compost pile of organic substrates, of which 15% was most efficient for the growth of Gerbera jamesoniiand reduction of expenses during the crop care.

• EffectofFly Ash on Organic Substrates andGrowth ofGerbera jamesonii

  Nguyen Thi Minh, Nguyen Tu Diep, Pham Minh Hieu

  Received: 12-06-2023 / Accepted: 07-03-2024

   Abstract PDF (VIETNAMESE)

  The purpose of this study was to determinethe effect offly ash ontheorganic substratesfor growing flower and ornamental plants in order to effectivelyreuse theagricultural and industrialwaste sources. The fly ash was added into rawmaterials toproduce organic substrate at different rates: 5%, 10%, 15% and 20% and incubated by the semi-aerobic method. The results indicated that the organic substrate from agricultural by-products supplemented with fly ash had goodnutritional content, limited presence of E. coliand Salmonella, withneutral pH, and acceptable heavy metal content(notexceeding QCVN 03-MT:2015/BTNMT standard) that ensures the growth and development of flowersand ornamentalplants. The experiment of growing Gerbera jamesoniion organic substrates supplemented with fly ash showed a cleareffect on growth rate, harvested yield, and the number of flowers harvested in the treatment supplemented with 15% fly ash with 1.75 flowers higher than the control without fly ash supplement 40%. Thefly ash rate of 10-15% appeared as appropriate range to add to the compost pile of organic substrates, of which 15% was most efficient for the growth of Gerbera jamesoniiand reduction of expenses during the crop care.

• Biology, Growth and Reproductive Performance of African Nightcrawler (Eudrilus eugeniae) Raised in a Tray Vermiculture System and Supplemented with the Concentrated Feed

  Han Quang Hanh, Nguyen Thi Xuan, Vu Dinh Ton

  Received: 04-02-2020 / Accepted: 14-05-2020

   Abstract PDF (VIETNAMESE)

  This study was undertaken to assess the biology and effects of 2 types of the concentrated feed in the diet on growth, reproductive performance and efficiency of organic waste degradation of African nightcrawler (Eudrilus Eugeniae) by a batch production on the tray vermiculture system with compound feed supplement. The breeding earthworms were kept in plastic trays (15 worms/tray) added with a substrate made of dried cow dung (550g/tray) under the laboratory conditions (temperature 23-28C, humidity 55-65%). The experiment was designed by 2 groups with 2 different concentrated feed in the diet (rice flour and yellow maize flour) and 3 replicates. The breeding earthworms were separated from the substrate every 10 days after laying. The cocoons were hatched and the growth of hatchlings was assessed up to 4 weeks of age. Results showed that the African nightcrawler had a big size and weight of both its body and cocoon that were appropriate for the intensive vermiculture by the tray system. Supplement of 2 types of concentrated feed in the diet resulted in high and equivalent efficiency of worm growth and reproductivity. After 4 weeks, each breeding earthworm produced 89.22-90.97 newly born hatchlings, equivalent to 8.11g dry matter of worm biomass, and the conversion ratio from solid waste to worm mass was 9.86:1-10:1. However, in the production condition, the indoor climate should be adjusted appropriately to the earthworm physiology, and the cost-benefit analysis should be conducted in order to achieve the highest performance and economic efficiency.

• In vitro Propagation of Morinda officinalisHow

  Hoang Thi The, Nguyen Thi Phuong Thao, Ninh Thi Thao, Nguyen Thi Thuy

  Received: 15-04-2013 / Accepted: 18-06-2013

   Abstract PDF (VIETNAMESE)

  Thestudy was conducted to establish the procedure for in vitropropagation of Morinda officianalisHow using stem segments. The stem segments were initiate cultured on MS medium containing 0,25 mg/l Kinetinand 1,0 mg/l BA, on which 96,6 % of explants induced shoots after 30 days of culture. The highest shoot multiplication rate (10,13 times) was obtained on MS medium supplemented with 3,0 mg/l BA; 0,2 mg/l IBA and 10,0 mg/l Riboflavin after 45 days of culture. Root induction medium was ½ MS containing 0,2 mg/l IBA and 0,4 g/l activated charcoal.The average rooting frequency was 100 % with a mean of 3.5 roots/shoot within 30 days. In vitroplantlets after 35-days period of rooting were the most appropriateforsuccessfulacclimatization in greenhouse. The highest frequency of acclimatized plantletswas 96,2 %inthe organic substrate containing 50 % of coconut fiber and 50 % of mushroom-production waste materials, the plantlets showed good growth and development.