Browsing by Author "PRIYANKA SHARMA"
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ThesisItem Open Access DISSIPATION KINETICS AND DIETARY RISK ASSESSMENT OF SOME PESTICIDES IN BELL PEPPER UNDER PROTECTED AND OPEN FIELD CONDITIONS(UHF,NAUNI, 2024-01) PRIYANKA SHARMA; P L SHARMAThe present investigations entitled “Studies on natural enemy complex of potato aphid, Macrosiphum euphorbiae (Thomas)” were conducted during the year 2021 and 2022 at Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. The diversity of natural enemies varied with host crop and Tomato was more diverse in natural enemy complex of M. euphorbiae having 12 species viz., Coccinella septempunctata (Linnaeus), Hippodamia variegata (Goeze), Episyrphus balteatus De Geer, Melanostoma sp., Cheilomenes sexmaculata (Fabricius), Chrysoperla zastrowi sillemii (Esben-Peterson), Harmonia dimidiata (Fabricius), Oenopia sauzeti (Mulsant), Propylea dissecta Mulsant, Episyrphus viridaureus (Wiedemann), Sphaerophoria indiana Bigot and Aphelinus asychis Walker as compared to potato having only 7 species namely C. septempunctata, H. variegata, E. balteatus, S. indiana, Ischiodion scutellaris (Fabricius), Eupeodes confrator (Wiedemann) and E. viridaureus. Both M. euphorbiae and its natural enemies (coccinellids, chrysopids, syrphids and parasitoid) followed negative binomial distribution throughout the season on potato and tomato. In laboratory studies on demographics, predatory potential and density responsiveness natural enemies like C. zastrowi sillemi, C. septempunctata, H. variegata, O. sauzeti and A. asychis showed promise against M. euphorbiae. The predatory potential increased with increase in age of predators. In each case, significant negative linear coefficients were obtained after logistic regression analysis between proportion of prey nymphs consumed (Na/N) and initial prey density (N) which indicated the Type-II functional response for all the stages of natural enemies. The attack rate decreased and handling time increased with the advancement of the development stage of the prey in all the cases. The natural enemies showed mutual interference when two or more individuals foraged in an arena. SignatureThesisItem Open Access MANAGEMENT OF POST-HARVEST LOSSES BY FARMERS’ DURING MARKETING OF VEGETABLE CROPS IN THE STATE OF HIMACHAL PRADESH(UHF Nauni, 2024-07-05) PRIYANKA SHARMA; Piyush MehtaThe present study focused on the management of post-harvest losses (PHL) by farmers during the marketing of vegetable crops in Himachal Pradesh, specifically targeting Tomato, Cabbage, and Green pea. Solan, Shimla, and Mandi emerged as key districts with significant vegetable concentrations, forming the primary basis for sample selection. Employing a multi-stage random sampling technique, data was collected from 360 farmers, with additional secondary data sourced from publications and government departments. The findings revealed varying trends in post-harvest losses across the selected crops and districts. While cabbage losses decreased, tomato losses increased significantly, and green pea losses exhibited fluctuations, with Shimla experiencing the highest losses. The ordered probit regression model identified factors influencing losses, including handling training, harvest time, distance to market, packaging, harvest method, storage facility, and market information access. Challenges in agricultural ecosystems, such as high-yielding seeds, lengthy marketing chains, high costs, lack of storage facilities, and insufficient post-harvest management knowledge, were highlighted using Kendall’s coefficient of concordance. The relative importance index underscored farmers' strategies for reducing losses, emphasizing market insights and efficient packaging. In conclusion, the study recommended the formulation of a comprehensive policy strategy to address post-harvest losses. This strategy should encompass infrastructure development, improved market accessibility, adoption of modern technology, quality control measures, research initiatives, financial assistance, and collaboration with agricultural extension services. These interventions aim to enhance the resilience of farmers against PHL, ensuring sustainable agricultural practices and food security in the state.ThesisItem Open Access STUDIES ON PROPAGATION OF MARIGOLD CV. ‘SIRACOLE’(UHF Nauni, 2024-01-24) PRIYANKA SHARMA; Dr Suman BhatiaThe present investigation entitled ‘Studies on propagation of marigold cv. Siracole’, was carried out at Floriculture Farm of Department of Floriculture and Landscape Architecture, Dr Yashwant Singh Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during 2022-23. The experiment was laid out in Completely Randomized Block Design (Factorial) to study the effect of various combinations of rooting media i.e., Cocopeat, Sand, Perlite and Vermicompost and different rooting hormone i.e., 500 ppm NAA, 250 ppm NAA on quality cutting production of marigold under different planting dates from February to July. Different root parameters like percent rooting, number of roots, length of the longest root, root fresh and dry weight, root volume and percent survival were observed to check the rooting performance of cuttings under different NAA treatments, various rooting media and different planting dates. From the studies, early rooting (18.33 days), maximum number of roots per cutting (43.37), fresh weight of roots (251.23 mg), dry weight of roots (29.69 mg), root volume (0.359 cm3) and highest percent survival (97.39%) of rooted cuttings were recorded when cuttings were treated with 500 ppm NAA as a rooting hormone and planted in the medium consisting of Cocopeat + Sand + Vermicompost (1:1:1v/v) in the month of June. While maximum percent rooting (96.82%) was found when 500 ppm treated cuttings were planted in the media comprising Cocopeat + Sand + Perlite (1:1:1v/v) in the month of June. From the studies, it may be concluded that 500ppm NAA is the best rooting hormone treatment for quality cutting production of marigold cv. ‘Siracole’ when planted in rooing medium consisting of Cocopeat + Sand + Vermicompost (1:1:1v/v). Further, June planting was found most suitable for quality cutting production.