Thumbnail Image

Thesis

Browse

2012 - 201922020 - 20221
Reset filters
Author: Davinder Singh × Start date: 2012 ×
Reset filters

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    ThesisItemEmbargo
    Geo-referenced inventorization and mapping of groundwater quality parameters of Ferozepur district of Punjab
    (Punjab Agricultural University, Ludhiana, 2022) Davinder Singh; Dhanwinder Singh
    A systematic study was conducted to assess the groundwater quality of Ferozepur district for drinking as well as irrigation purposes. Grid based, 604 groundwater samples were collected from November 2021 to April 2022 and GPS location of each was recorded. The water samples were analysed for pH, EC, TDS, TH, Ca2+, Mg2+, Na+, K+, Cl-, F-, NO3-, SO42-, HCO3-, As, B, Se, Cr, Ni, Pb, Fe, Cu, Zn and Mn. The spatial variability maps for all these parameters were built using ArcGIS software. Considering these parameters, groundwater quality was evaluated, both w.r.t drinking and irrigation purposes. It was observed that parameters TDS, TH, Na+, K+, Mg2+, HCO3-, NO3-, SO42-, F-, B, As and Se were above their respective acceptable limits for drinking purpose. Among different blocks of Ferozepur district, Ghall Khurd was the most affected block with a considerable number of water samples not suitable for drinking purpose and Mamdot was the least affected one. However, the groundwater was not polluted with heavy metals as the heavy metal pollution index was Ca2+ > Mg2+ > K+ and anions were in the order HCO3- >SO42- >Cl- >F-. According to Gibbs plot and different scatter diagrams, rock-water interaction, evaporation, direct ion exchange process and silicate weathering were the major hydrogeochemical processes affecting the groundwater chemistry in the Ferozepur district. Piper diagram indicated that most of the water was of magnesium bicarbonate type and sodium chloride type. Overall, the water needs proper management practice before drinking use and in areas having marginal quality waters, proper recommendations must be adopted for irrigation use. The study suggests that long term monitoring and proper management must be done, so as to prevent any human health hazard and to get sustained crop productivity in the Ferozepur district.
  • Thumbnail Image
    ThesisItemOpen Access
    Assessment of genetic diversity in carrot genotypes using morphological, biochemical and molecular markers
    (Punjab Agricultural University, Ludhiana, 2018) Davinder Singh; Dhillon, Tarsem Singh
    The study entitled “Assessment of genetic diversity in carrot genotypes using morphological, biochemical and molecular markers” was carried out at Vegetable Research Farm, Department of Vegetable Science, Punjab Agricultural University, Ludhiana. Eighty one genotypes of carrot were characterized by morphological, biochemical and molecular markers during 2015-16 and 2016-17. Analysis of variance showed significant differences for 19 quantitative traits with respect to treatment, year and treatment x year. Maximum total root yield was obtained from genotypes viz. PC-161, PC-15, PC-43 and PC-103 (red), PCO-30 and PCO-5 (orange) and PCP-2 and PCP-1 (purple). On the basis of morphological diversity, 81 genotypes were distributed into ten clusters. Cluster X was the best for root weight and anthocyanin content, cluster III for days to 1st root harvest and root girth, while dry matter content, total sugar content and carotene content were maximum in cluster V. The highest intra cluster distance has been observed from the cluster VII (162.9), while inter cluster distance was maximum between II and cluster X (43678.5). The cumulative proportion of variation explained by the four PC-axes was 85.12 %. Seventeen polymorphic SSR markers differentiated genotypes into three groups where cluster I consisted of 48 genotypes followed by cluster II with 28 genotypes and cluster III had 5 genotypes. The morpho-biochemical and SSR markers were effective tools to identify closeness among genotypes, so future strategy involves utilizing more SSR markers culled from various linkage mapping could be effectively and efficiently used to fasten the breeding programs and to design trait specific carrot breeding.
  • Thumbnail Image
    ThesisItemRestricted
    MANAGEMENT OF SEED BORNE DISEASES OF RICE
    (Punjab Agricultural University, Ludhiana, 2012) Davinder Singh
    The rice crop is prone to several diseases such as bacterial blight (Xanthomonas oryzae pv. oryzae), Brown leaf spot (Drechslera oryzae Drechsler), Foot rot (Fusarium moniliforme Sheldon) and Blast (Pyricularia oryzae Cavara). These diseases have become an important constraint in rice production in Punjab during recent years. In vitro and under glass house conditions it was found that Emisan - 6 + Streptocycline and Nativo 75 WG + Streptocycline gave higher germination, minimum microflora and less disease severity among all the chemicals tested. Out of six chemicals evaluated under in vitro conditions for their efficacy against X. oryzae pv. oryzae, D. oryzae, F. moniliforme, P. oryzae and R. Solani. It was found that Streptocycline and Emisan-6 were the most effective against X. oryzae pv. oryzae, Emisan -6 and Nativo 75 WG against D. oryzae and P. oryzae, Nativo 75 WG and Bavistin 50 WP against F. moniliforme and Emisan - 6 and Bavistin 50 WP against R. solani. In field conditions seed treatment with Emisan-6 + Streptocycline, Nativo 75 WG + Streptocycline and Bavistin 50 WP + Streptocycline were the most effective against all seed borne disease of rice which also gave higher grain yield among all the chemicals tested. Amistar 25 SC acts as a growth promoter which results in more root- shoot length, dry and fresh weight and more number of tillers per plant than all the chemicals tested.