PG Thesis
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Item Mild storage invigoration with nanoparticles in chilli (Capsicum annuum L.)(Department of seed science and technology, College of Agriculture,Vellanikkara, 2023-11-17) Gagana, G; Dijee, BastianItem Induction of genetic variability in guinea grass (Panicum maximum Jacq.) Var.Makuenii(Department of Agricultural Botany, College of Agriculture, Vellayani, 1989) Rani, N; Vijayagopal, P DGuinea grass (Panicum maximum J.) being a facultative apomicts under continuous vegetative propagation carry very little variability. The cross incompatibility also restricts attempts to produce variability through conventional methods of plant breeding. The main objective of the study is to induce variability through mutations in guinea grass variety Makuenii using gamma rays at four doses ranging from 15 Krad to 30 Krad and EMS at four concentrations ranging from 0.25 percent to 1.00 percent. The effect of the mutagens in M1 and M 1 V1 generations were studied. The observations in the M1 generation indicated that germination of seeds was progressively reduced with increase in the dose of mutagens. The survival and early growth of seedlings were adversely affected by the mutagen treatments. The seedlings appeared to suffer from the transplanting shock as indicated by high mortality of the plants in the field. Higher doses of mutagens induced height reduction. However the tillering ability of the plants did not seem to have been affected but higher doses of mutagens inhibited flowering initiation. Pollen sterility in M1 generation exihibited dose dependence. A few chlorophyll chimeras were observed in the M1 generation. Morphological abnormalities induced dwarf, tall, semi open and open types with leaf and inflorescence modifications. The means of M1 V1 clones exhibited both positive and negative shifts from the population means with respect to plant height. Treatments 20 Kard gamma rays and 0.25% EMS caused positive shifts in the means of girth at internode and leaf area index. Certain clones were identified to have higher green fodder yield than the control. These clones also had higher girth at internode and higher leaf area index. The study revealed that variability with respect to plant height, girth at internode, leaf area index and green fodder yield can be induced by mutations using appropriate doses of gamma rays and EMS. A medium dose of 20 Krad gamma rays and a relatively lower dose of 0.25 percent EMS were found to induce more useful variations.Item Seed priming and foliar nutrition of upland rice in coconut garden(Department of Agronomy,College of Agriculture, Vellayani, 2019) Gopakumar, A T; Parthapan, KItem Augmentation of pollination in culinary melon (Cucumis melo var. acidulus L. Naudin) with Indian bee (Apis cerana indica Fab.)(Department of Agricultural Entomology, College of Agriculture, Vellayani, 2019) Aneetta, M R; Amritha, V SItem Effect of seed treatment on growth, seed yield and quality in okra (Abelmoschus esculentus L. Moench(Department of Seed Science and Technology College of Horticulture, Vellanikkara, 2018) Adersh, S; Dijee BastianItem Influence of Irrigation on germination, growth and yield of sesamum(Department of Agronomy, College of Agriculture, Vellayani, 1985) Thomas Mathew; Mohamed Kunju, UA field study was undertaken at the Rice Research Station, Kayamkulam, during the third crop season of 1983-84 to find out the influence of irrigation on germination, growth and yield of sesamum, with eleven main plot treatments as time of sowing and three sub plot treatments as frequency of irrigation. There were 33 different treatment combinations The study revealed that the optimum soil moisture for maximum germination of sesamum seed is 12.72 per cent. Moisture contents above or below this adversely affect the germination percentage. Optimum soil moisture for germination could be achieved by irrigating the plots to field capacity and sowing one day after the irrigation. Dry matter production, number of seeds per capsule, distribution of dry matter in capsule, seed yield, oil content, oil yield and shelling percentage were highest in the treatment where sowing was done one day after the initial irrigation. Maximum uptake of N, P and K was also observed in this treatment. One irrigation at the vegetative phase or two irrigations one at the vegetative and the other at the reproductive stages have favourably influenced the growth characters like plant height, number of leaves, number of branches and nodes, leaf area, dry matter production, number of capsules per plant, capsule weight per plant, number of seeds per capsule, seed weight per plant and seed yield per ha. The oil content, oil yield and the uptake of N, P and K were also maximum in the above Irrigation treatments. The study revealed that irrigating the plot to field capacity and sowing the seeds one day after irrigation has resulted in obtaining maximum germination and optimum plant density. Similarly irrigation during the growth phases have also increased the seed yield. Maximum seed yield of 859 kg/ha. was produced by sowing the seeds one day after Initial irrigation followed by giving one irrigation each during the vegetative and reproductive phases.Item Screening of Ailanthus triphysa (Dennst.) alston. for preferred match wood qualities(Department of Wood Science, College of Forestry, Vellanikkara, 2017) Bill Nelson Paul; Anoop, E VAilanthus triphysa, a member of the family Simarubaceae is an important tree with regard to match manufacture. Twenty Candidate plus trees (CPTs) were selected from 10 panchayats across two districts (Thrissur and Palakkad) in Kerala to study the variation in wood properties and the growth parameters of their half-sib progenies during 2013-2017. Core samples were collected to analyse the anatomical properties and fibre indices between the CPTs, which was later found to vary significantly at one percent level. Morphological and growth parameters were observed in the half-sib progenies of the selected trees both in nursery and field condition for 150 days each. The morphological parameters like height, collar diameter, root length, leaf area, number of leaves etc. were found to vary significantly at nursery but not throughout the study period. Relative Growth Rate, Absolute Growth Rate and Net Assimilation Rate did not show significant variation among the seed sources. Field performance of the progenies was evaluated at Aaramkal, Vellanikkara, Thrissur, Kerala in RBD. Height and collar diameter varied significantly initially but the differences were not significant for collar diameter from 90 days after planting. However, survival percentage did not show any significant difference between the progenies. FCV AT 1 showed the maximum height growth at 150 days after planting. A questionnaire survey was conducted to access farmers’ perception towards growing raw materials for match manufacture. The respondents had an overall positive approach toward tree farming. The majority of the respondents were confident that scientific guidance will help them in increasing the yield.Item Screening of coconut varieties for tolerance to high temperature stress using pollen viability test(Academy of Climate Change Education and Research Vellanikkara, 2016) Helen Mary Rose; Anitha, SItem Diversity of echinochloa spp. and their response to select herbicides(Department of Agronomy, College of Horticulture, Vellanikkara, 2017) Aparna, K K; Meera V Menon