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2016 - 20192
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Subject: Plant Physiology × Author: Das, Sudeshna × Start date: 2015 × Type: Thesis ×
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    ThesisItemOpen Access
    Explicating the influence of Silicon in relation to growth dynamics, biotic stress and tolerance to water deficit conditions in different genotypes of rice (Oryza sativa L.)
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-09) Das, Sudeshna; Shankhdhar, S.C.
    Rice is one of the leading agricultural crops serving as the staple food crop for almost 50% of the existing people in the world. As the population continues to expand and climate change occurs, the escalation in food requirement is inevitable. Environmental stress (biotic and abiotic) owing to climate change alters the growth and development of plants leading to an enormous loss in crop yield and productivity. A field experiment was laid out in split-plot design replicated thrice with four treatments viz., T1: Control, T2: Si fertilized T3: Si + Drought stress and T4: Drought stress. The study was conducted during the kharif season of 2017 and 2018 to evaluate the influence of Si on growth dynamics, biotic stress and tolerance to water deficit conditions in different genotypes of rice. Various morphological, yield attributes and biochemical parameters in five genotypes namely PA-6129, US-312, KRH-4, IR-64 and Sahabhagidhan were observed. Nutrient content estimation as well as biotic stress incidence analysis was also conducted. Silicon was found to have an encouraging influence on the growth and development and yield under wellwatered as well as water-deficit conditions. Growth parameters such as plant height, tiller number, leaf number, LAI and biomass accumulation as well as yield and yield attributes such as panicle number, spikelet number, grain number, test weight and harvest index were found to enhance. Chlorophyll content, chlorophyll fluorescence, protein and amylose content together with SOD activity revealed a positive response on application of silicon. Proline and MDA content was found to decline. Upsurge in nutrient content uptake was also witnessed. KRH-4 and US-312 was recognized to deliver a commendable response to silicon fertilization under well-watered as well as water deficit conditions.
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    ThesisItemOpen Access
    Effect of different doses of nitrogen on yield and grain quality in rice (Oryza sativa l.) genotypes
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-06) Das, Sudeshna; Shankhdhar, S.C.
    Rice is one of the most important agricultural crops which serve as a staple food crop for almost 50% of the people existing in the world. As the population continues to expand, the demand for food crops also continues to increase. Injudicious use of nitrogenous fertilizers by the farmers in order to increase the yield has led to a detrimental impact on the crop as well as the environment. A field experiment was conducted during the kharief season of 2015 to evaluate the responses of different nitrogen doses (N0, N50 and N100) on the various morphological characteristics (plant height, harvest index, yield, chlorophyll and nitrogen content), yield attributes and grain quality in six genotypes namely NBTPP-1 (Varadhan X BPT5204/6), NBTPP-4 (Sampada X Jaya/3), NBTPP-6 (Rasi X Jaya/2), NBTPL-1 (Varadhan), NBTPL-3 (Sampada) and NBTPL-5 (MTU-1001) were observed. Maximum plant height at tillering was recorded for NBTPL-5 (55.56 cm) at N100 level and minimum height was observed for NBTPL-3 (38.22 cm) at N0 level. Maximum height at flowering was observed for NBTPL-5 (139.11 cm) at N100 level and minimum height was observed for NBTPP-6 (85.22 cm) at N0 level. Maximum harvest index was observed for NBTPL-1 (45.35 %) at N50 level and minimum harvest index was observed for NBTPL-5 (30.99 %) at N0 level. Yield and chlorophyll content was found to be highest at N100 and lowest for N0. Nitrogen content was highest for NBTPP-1 (1.53 %) at N100 level and minimum for NBTPP-6 (1.30 %) at N0 level. Silicon and amylose content was found to have a decreasing trend with increasing level of nitrogen. NBTPL-5 was found to perform better in N50 level of nitrogen dose. NBTPP-4 had the maximum grain yield and thus can be suggested for the N100 level.