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Browsing Theses by Author "Abhishek Kumar"
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ThesisItem Open Access Effect of P and Zn interaction on growth, yield, nutrient uptake and quality of maize (Zea mays L.) cv. HQPM-1 grown in mollisols(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-06) Abhishek Kumar; Singh, VeerA field experiment was conducted during kharif 2012 to find out the effect of P and Zn interaction on growth, yield, nutrient uptake and quality of maize (Zea mays L.) cv. HQPM-1 grown in mollisols at Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand. The treatments replicated thrice in a factorial randomized block design (F-RBD) and the experiment consisted of 10 treatments. Growth and yield attributing characters of maize significantly affected by application of various P and Zn levels which in turn increased grain and stover yields of maize. The plant growth parameters viz., plant height and number of leaves was observed highest with the application of 60 kg P2O5/ha along with 15 kg Zn/ha. Days to 50 per cent tasseling and silking were found minimum with the combined application of 15 kg Zn/ha and 60 kg P2O5/ha but anthesis silking interval (ASI) was found minimum under 10 kg Zn/ha and 90 kg P2O5/ha combination which consequently improved grain yield. Interaction effect of 10 kg Zn/ha along with 60 kg P2O5/ha significantly increased cob and grain yield by 59.3 and 48.1 q/ha, respectively, over control (36.3 and 25.0 q/ha). Combined application of 10 kg Zn/ha and 60 kg P2O5/ha in general increased the availability of soil nitrogen, phosphorus, and zinc. Total phosphorus and zinc uptake was found highest under treatment T10 and T5 respectively. Protein, tryptophan and lysine content in maize grain significantly affected with the Zn and P levels and highest values of 20.7, 0.29 and 1.15 %, respectively, were observed with 60 kg P2O5/ha and 10 kg Zn/ha combination. All the yield attributes attained the positive but no-significant correlation with soil pH, EC and available Zn but soil available P showed significant and positively correlation with grain yield (0.680*). Tryptophan and lysine contents of grain were significantly correlated with available P (0.799**, 0.792**), grain P (0.787**, 0.790**) and grain Zn (0.755*, 0.789**), respectively. Among all the treatments, combined application of 10 kg Zn/ha and 60 kg P2O5/ha (T6) was found superior over other treatments for most of the growth, yield and quality parameters.ThesisItem Open Access Performance comparison of solar cooker using different phase change materials during off sunshine hours(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-09) Abhishek Kumar; Bhandari, Susheel SinghThe continuous increase in the level of greenhouse gas emissions and the increase in fuel prices are the main driving forces behind efforts to more effectively utilize various sources of renewable energy. In many parts of the world, direct solar radiation is considered to be one of the most prospective sources of energy. Energy requirement for cooking accounts for 36% of total primary energy consumption in India. Hence, there is a critical need for the development of alternative, appropriate, affordable mode of cooking for use in developing countries. However, the large scale utilization of this form of energy is possible only if the effective technology for its storage can be developed with acceptable capital and running costs. Solar cooker is the best way to utilize solar energy. In the present work thermal performance of a box type solar cooker has been evaluated according to the bureau of Indian standard (BIS). The BIS suggested two test for evaluation of thermal performance. The first test is stagnation test for evaluation of first figure of merit F1.The second test is full load test for the determination of second figure of merit F2. The first figure of merit is obtained by conducting the stagnation temperature test without load for empty box type solar cooker. The first figure of merit is the ratio of optical efficiency to heat loss factor. The second figure of merit is obtained by sensibly heating a known amount of water and it is a measure of heat exchange efficiency factor of a box type solar cooker. The variation in second figure of merit is also studied by increasing load and number of pots. It is found from experimental study that second figure of merit increases with load and number of pots. The value of figure of merit imply that the cookers are identical and satisfy BIS standard. The performance comparison of solar cooker using different phase change materials during off sunshine hours is main emphasis of the present experimental study. Cookers are also studied using modified finned cooking vessel. Three different phase change materials paraffin wax, stearic acid, lauric acid are selected. It is found from experimental studies that finned cooking vessel increases efficiency and reduces the cooking time. Paraffin wax is best phase change material to store latent thermal energy during sunshine hours and to retrieve back its conserve energy to thermic fluid water during off sunshine hours.