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  • [会议] The Effect of Explant Types and Plant Growth Regulators On Callus Induction of Geranium (Pelargonium graveolens L'Her) In Vitro
    摘要:The purpose of this study was to determine the effect of explant types and plant growth regulators on callus induction of geranium (Pelargonium graveolens L'Her). Callus induction was carried out by culturing leaf and petiole explants from ex vitro geraniums on MS + 0.5 mg/l 2.4-D + 0.1 and 0.3 mg/l Benzyladenine (BA) or Kinetin. Each culture was carried out in 5 replications, cultures were incubated in rooms 25°C and 600 lux. The parameters days for callus induction and percentage of callus formation were observed. Geranium callus formation was influenced by types of explants and plant growth regulators. Petiole explants was able to induce callus better than leaf explants. Days for callus induction at second week and percentage of callus formation of petiole explants were 58 and 58% compared to leaf explants were only 53 and 54%. Plant Growth Regulators BA combined with 2.4-D was able to induce callus better than kinetin. The best callus formation was produced from petiole explants cultured on MS + 0.5 mg/l 2.4-D + 0.3 mg/l BA by 84%.
  • [会议] Synthesis and characterization of thymol-loaded lauryl glycol chitosan for pesticide formulation
    摘要:Thymol is a hydrophobic active ingredient and widely used as an alternative pesticide for pest control. However, due its low solubility in water, a water-soluble carrier is required in its formulation. Therefore in this study, the potential of an amphiphilic chitosan, namely lauryl glycol chitosan (LGC) as a carrier to encapsulate and release thymol was evaluated. The physical and chemical properties of LGC were characterized using Fourier Transform Infrared (FTIR) Spectrometer, Proton Nuclear Magnetic Resonance (1H NMR) Spectrometer, UV-Visible Spectrophotometer, Thermogravimetric Analyser (TGA) and Transmission Electron Microscope (TEM). A Fluorescence Spectrometer was used to determine the critical micelle concentration (CMC) value of LGC in aqueous solution. The encapsulation efficiency of LGC for thymol was determined by using a High Performance Liquid Chromatography (HPLC). The FTIR and 1H NMR analyses confirmed the structure of the synthesized LGC. It was noted that the addition of lauryl and glycol groups to the chitosan backbone has enhanced the solubility properties of chitosan in neutral and basic media. TEM observation confirmed that LGC could form self-aggregates in the solution with a spherical shape. The CMC value determined for LGC was 0.008 mg/mL. LGC exhibited good affinity towards thymol with an encapsulation efficiency of 58%. The findings from in vitro release study showed that the LGC could prolong the release of thymol from its micelles. Results from this study highlight that LGC possesses great characteristics to be further developed as a promising carrier in the pesticide formulation.
  • [会议] A Novel Approach to detect the Compound Level of Fertilizer and Pesticide in the Soil
    摘要:Fertilizers (Triple superphosphate) and pesticide (fungicide and insecticide) are one of the major products used to increase the productivity of crops. As time passes the amount of pesticide in crops is not maintained fixed. Pesticide does react with water and the level of pesticide decreases day by day. Hence, it is important to know the present level of pesticide in soil and crops. TSP and pesticide (fungicide and insecticide) are used in this project as a sample of fertilizer and pesticide, cause of its high demand in Bangladesh. To detect the amount of TSP and pesticide in the oil sample, the conductivity property of TSP and pesticide (fungicide and insecticide) are used. Three separate solutions of TSP and pesticide (fungicide and insecticide) is made with water then AC source is applied to the solution instead of DC to avoid electrolysis of the given solution. Through the op-amp and two comparators, the final result is accomplished. Those two comparators, comparator 1 and comparator 2 were used to find the presence of 30%, 50%,70% TSP and Pesticide respectively. As result suggest, the resistance of the solution decreases with the incremental frequency. The compatible frequency for AC source is selected as 40 KHz. The reference voltage of comparator 1 is 1.4v and comparator 2 is 5v.
  • [会议] Study of takeoff constraints for lifting an agriculture pesticide sprinkling multi-rotor system
    摘要:The revolution in the mechatronics field made a new era for the monitoring and supervision of agriculture management systems. In precision agriculture, crop protection drones have great potential due to its flexibility in handling to increase crop productivity. However, the multi-rotor aerial system working capability depends on the required thrust to be produced in order to lift the system from the ground position. This work proposes simulation and theoretical static thrust calculations to develop an autonomous multi-rotor system, which is capable of lifting the components, those are helpful for precision farming. This work starts with an analytical approach of the thrust equation and its influences at various parameters explained. The motion equations are derived using the kinetic energy, disk actuator theory and momentum theory. The thrust is calculated using the parameters, motor specifications, propeller dimensions and constant. If the calculated thrust is twice to the total weight of the multi-rotor system, then the system has the ability to fly comfortably toward the crop agriculture field. The calculation is done for different propellers and chosen the best one. The chosen theoretical result validated using a static thrust calculator in a Web site from “gobrushless.com.” The relative error between the simulated and theoretical results has shown only 2% of the difference.
  • [会议] A novel calibration transfer method of NIR spectra to identify ultra-low concentration of pesticide residues
  • [会议] Study on Heath Forest Species Melaleuca cajuputi as Potential Natural Herbicides Agent to Suppress Weed Growth in Landscape Management
    摘要:Weeds are diverse in habitats throughout the world. In landscape management, weed is of major concern because they compete for growth factors with landscape plant of interest. Modern management relies on the importance of synthetic chemicals to control weeds as unwanted plants to reduce the weed management cost. The use of herbicides is not an appropriate tool for controlling development of some weeds but can create negative effects to the environment. Managing the natural and landscape resources are not only designing for good views and environment merely, but need to sustain all of living environment through consideration. Therefore, this study was aimed to explore Melaleuca cajuputi, heath forest species as potential natural herbicides agent in sustainable landscape management. Three assessments were conducted to determine their effectiveness towards suppressing weeds without degrading the environmental quality index. Assessment of allelochemical compounds in M. cajuputi demonstrated that these species have allelopathic potential as a natural herbicide.
  • [会议] Characterization of neutralized wood vinegar derived from durian wood (Durio zibethinus) and its prospect as pesticide in acidic soil
    摘要:Wood vinegar is a brown liquid by-product obtained from the carbonization process. Wood vinegar could limit the usage of wood vinegar as pesticide in acidic soil because of its acidity. This study aimed to determine the main organic and inorganic components in neutralized durian wood vinegar. Wood vinegar was made by pyrolisis of durian wood in the absence of oxygen with a temperature of 350, 450, and 550 °C for 2 hours. Before being analyzed, wood vinegar was neutralized with NaOH 25% to formulate the new friendly pesticide in an agricultural field. Characterization for acidity was by pH meter; organic compounds were using GC-MS; inorganic compounds were using AAS. The result showed that both neutralized wood vinegar and acidic wood vinegar indicated groups of organic acids, phenol and carbonyl compounds, which were suspected as pesticides. The predominant component in acidic wood vinegar was guaiacol, while in neutralized wood vinegar was pyrocatechol. Both acidic and neutralized wood vinegar indicatively contained main inorganic elements such as sodium, calcium, potassium, magnesium, iron and zinc that could serve as a natural pesticide. Based on the analysis result of inorganic elements, there were significant differences between acidic and neutralized wood vinegar except for Ca.
  • [会议] A Novel Approach to detect the Compound Level of Fertilizer and Pesticide in the Soil
    摘要:Fertilizers (Triple superphosphate) and pesticide (fungicide and insecticide) are one of the major products used to increase the productivity of crops. As time passes the amount of pesticide in crops is not maintained fixed. Pesticide does react with water and the level of pesticide decreases day by day. Hence, it is important to know the present level of pesticide in soil and crops. TSP and pesticide (fungicide and insecticide) are used in this project as a sample of fertilizer and pesticide, cause of its high demand in Bangladesh. To detect the amount of TSP and pesticide in the oil sample, the conductivity property of TSP and pesticide (fungicide and insecticide) are used. Three separate solutions of TSP and pesticide (fungicide and insecticide) is made with water then AC source is applied to the solution instead of DC to avoid electrolysis of the given solution. Through the op-amp and two comparators, the final result is accomplished. Those two comparators, comparator 1 and comparator 2 were used to find the presence of 30%, 50%, 70% TSP and Pesticide respectively. As result suggest, the resistance of the solution decreases with the incremental frequency. The compatible frequency for AC source is selected as 40 KHz. The reference voltage of comparator 1 is 1.4v and comparator 2 is 5v.
  • [会议] Growing grain of winter wheat without the use of herbicides
    摘要:The models for predicting the contamination of winter wheat crops are presented, including a method of tillage, sowing time and sowing density. They make it possible, after appropriate calculations, to establish the parameters of agricultural practices, the use of which allows growing high grain yield of winter wheat without the use of herbicides, thereby making its growing technology more environmentally friendly and less energy-intensive, reducing not only the cost of grain but also natural environment pollution.
  • [会议] BANDED AND IN-FURROW ACTIVATED CHARCOAL IMPROVES WILDFLOWER TOLERANCE TO PREEMERGENT HERBICIDES

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