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Articles by Narendra Kumar
Total Records ( 4 ) for Narendra Kumar
  Dhananjay Kumar Yadav , Dinesh Singh and Narendra Kumar
  Background and Objective: The Bacterial wilt caused by Ralstonia solanacearum (R. solanacearum) (Smith) Yabuuchi is a serious disease of tomato (Solanum lycopersicum L.) in tropical, subtropical and temperate areas of world including India and reduces the crop yields significantly. This study aimed to investigate the antibacterial activity through induction of defense-related enzymes by Bacillus amyloliquefaciens (B. amyloliquefaciens) DSBA-11 to manage bacterial wilt disease of tomato. Materials and Methods: Bacillus amyloliquefaciens DSBA-11was inoculated to two tomato cultivars Pusa Ruby (susceptible) and Arka Abha (moderate resistant) along with pathogen R. solanacearum UTT-25 at root zone of tomato under control conditions in Phytotronat 28°C and relative humidity was 67-75%. The one-way analysis of variance for biocontrol efficiency and yield of tomato was made by the SAS general linear model (GLM) procedure. Results: Minimum bacterial wilt intensity was recorded in Arka Abha (14.98%) treated with B. amyloliquefaciens DSBA-11 followed by Pusa Ruby (21.64%) which was significantly lower than the control treated only with R. solanacearum after 60 days of inoculation. Tomato seedlings of both cultivars cv. Pusa Ruby and Arka Abha treated with DSBA-11 produced significantly elevated production of superoxide dismutase (SOD), peroxidase (POD), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL) and catalase(CAT) as compared to control. Conclusion: The enhancement of induced systemic resistance enzyme activities in two tomato cultivars which could involve in suppression of the wilt disease.
  Yogendra Arya , Narendra Kumar , S.K. Gupta and Pankaj Chawla
  This study presents the Load Frequency Control (LFC) of four-area interconnected reheat thermal power system using Fuzzy Logic based PI controller (FLPI). The system is incorporated with governor dead band, generation rate constraint non-linearities and boiler dynamics. The conventional PI controller does not yield adequate control performance when considering the non-linearities and boiler dynamics. The aim of FLPI controller is to restore the frequency and tie line power very smoothly to its nominal value in the shortest possible time. Four performance criteria, i.e., settling time, peak overshoot, Integral Absolute Error (IAE) and Integral of Time Multiplied Absolute Error (ITAE) are utilized for the comparison. The comparison between the conventional PI controller and the proposed controller show that the proposed controller can generate the best dynamic response following load perturbation in either area of the system. Robustness of the proposed controller is achieved by analyzing the system responses with varying system parameters.
  Narendra Kumar
  Background and Objective: Pigeon pea [Cajanus cajan (L.) Millsp.] suffers great losses due to fungal infections. For protection farmers use sulphos which have negative effects. So essential oils from higher plants need to be tried for its antifungal potential and safe storage of pigeon pea having no negative effects. Materials and Methods: The fungal investigations on stored food seeds of Pigeon pea were done through agar plate as well as blotter paper methods. Essential oils were separately isolated from 20 plants. MIC, nature, spectrum, effect of physical factors were decided and in vivo efficacy of Tinospora cordifolia (T. cordifolia) leaf oil was studied for safe storage of pigeon pea. Results: The fungal investigations on stored food seeds of stored food seeds of Pigeon pea [Cajanus cajan (L.) Millsp.] showed presence of 16 fungal species. Out of these fungal species Aspergillus flavus, A. niger was found to be dominant on the basis of frequency (%). The Tinospora leaf oil showed absolute toxicity (100%) against frequently present Aspergillus flavus, Aspergillus niger at concentration of 400 ppm and fungicidal at 600 ppm. At 500 ppm inhibited 10 fungi and at 800 ppm concentration 15 fungi. There was no adverse effect of physical variants viz., temperature treatment up to 100°C, autoclaving at 15 lb/square inch pressure at 120°C and storage up to 120 days on potential of leaf oil. In vivo experiments revealed that Tinospora oil when applied as seed dressing agent and as a fumigant was able to preserve food seeds of pigeon pea up to 120 days having minimal changes in organoleptic behaviour during storage. Conclusion: It revealed that T. cordifolia leaf essential oil have more fungitoxic efficacy in comparison to synthetic pesticides.
  Narendra Kumar and S.M. Paul Khurana
  Background and Objective: The Aravalli hills of Gurgaon district Haryana have high richness of biodiversity. This necessitates to find medicinal wealth for human use. The aim of this study was to investigate and record medicinal uses of plants by the inhabitants of in and around Aravalli hills in Gurgaon district, Haryana, India. Materials and Methods: An ethnobotanical study was conducted from March, 2014-2019 onwards through personal interviews of local villagers/farmers. The standard ethnobotanical methods were followed. The plants were identified by available literature and flora. The data was collected though a series of field investigations. The systematic and random sampling methods were employed to study different locations. Ethnobotanical information was gathered using semi-structured interviews. Results: The paper records (count) 53 important plant species of medicinal value from different families. Most of the plant species belonged to family Fabaceae followed by Moraceae and Asteraceae. Conclusion: Hence, the study revealed that Aravalli hills Gurgaon has much useful medicinal floras, that local people can use the parts of the plant in disease treatment and can modify, the ways of formulation application/administration and ingredients used in preparation.
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