Simulation of nitrogen balance in rice as influenced by irrigation, nitrogen and climate change scenario
| dc.contributor.advisor | Vashisht, B.B. | |
| dc.contributor.author | Gurpreet Singh | |
| dc.date.accessioned | 2018-02-09T04:49:20Z | |
| dc.date.available | 2018-02-09T04:49:20Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | Yield potential of rice depends on climatic factors including rainfall, solar radiation and temperature as well as irrigation regime, cultivar and fertilizer nitrogen level. The excessive fertilizer N is being applied by farmers in the quest for higher yields ignoring economic water and N productivities, and environmental pollution. Whole fertilizer N not utilized by rice plants, some portions of N fertilizer are easily lost through various processes, such as NH3 volatilization, leaching and uptake. With prime importance to quantify the nitrogen balance components in rice, field studies were conducted at two different locations at research farms of Department of Soil Science, Punjab Agricultural University, Ludhiana, Punjab, on sandy loam soils during kharif 2016. In the field study, effect of irrigation regimes (irrigation based on two days drainage period, and based on soil water suction (16 kPa)) and nitrogen levels (0, 60, 120 and 180 kg N ha-1) on growth, yield of rice and nitrogen uptake were evaluated. To assess the N balance components, DNDC (Denitrification-Decomposition) model was evaluated and simulations for yield and N balance components were made for past 30 years (1986-2016) and future 30 years (2021-2050) on different soil series of Ludhiana district of Punjab. Averaged over irrigation regimes, rice yield increased significantly with increasing nitrogen levels. Highest rice grain yield was recorded with application of 180 kg N ha-1 (52.9-59.6 q ha-1), which was significantly higher than control, 60 and 120 kg N ha-1 at location 1 but at par with application of 120 kg N ha-1 at location 2. N uptake was also found higher (46.3-56.4 kg ha-1) in the treatments with 180 kg N ha-1. However, treatments with 60 kg N ha-1 gave higher nitrogen use efficiency in terms of agronomic (20-25 kg kg-1) and recovery (54.8-59%) efficiency. Simulated rice yield, N uptake and volatilization would decrease with lower nitrogen levels, coarseness in soil texture and future time slices but leaching losses would increase with higher nitrogen levels, coarseness in soil texture and future time slices. However, percent reduction in yield would be more in end part of mid century (2041-2050). Percent yield reduction would be low at higher nitrogen levels (150-180 kg N ha-1) and in fine textured soils (silt loam). The study suggests that higher N levels could be good option to compensate yield reduction in future however higher nitrogen levels would lead to higher N leaching and volatilization. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810040735 | |
| dc.keywords | Rice yield, Climate change scenario, DNDC model, Nitrogen balance components, Nitrogen use efficiency, Volatilization, Leaching | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 65 | en_US |
| dc.publisher | Punjab Agricultural University, Ludhiana | en_US |
| dc.research.problem | Simulation of nitrogen balance in rice as influenced by irrigation, nitrogen and climate change scenario | en_US |
| dc.sub | Soil Science | en_US |
| dc.theme | Simulation of nitrogen balance in rice as influenced by irrigation, nitrogen and climate change scenario | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Simulation of nitrogen balance in rice as influenced by irrigation, nitrogen and climate change scenario | en_US |
| dc.type | Thesis | en_US |