A field experiment was conducted during 2019-20 and 2020-21 to study the effect of nutrient management and rice establishment methods on rice productivity, profitability, nutrient uptake and energetics in rice-groundnut cropping system in coastal Odisha. The experiment was laid out in factorial randomised block design during the Kharif and in split-plot design during the Rabi seasons with three replications. Six treatment combinations comprising of two rice establishment methods viz., direct seeded rice (DSR) and transplanted rice (TPR) and three nutrient management practices, viz., inorganic source, organic source and integrated nutrient management (INM) to rice during kharif were allotted to the main-plots. Three nutrient management practices to groundnut viz., 75% soil test based inorganic fertilizers (STBF), 100% STBF (inorganic) and INM during rabi were allotted to the sub-plots. The results of the study revealed that TPR resulted in 3.3% higher grain yield (5.65 t ha-1) than DSR. TPR also fetched the higher mean cost of cultivation (Rs. 77, 816 ha-1) and gross returns (Rs. 1, 12, 353 ha-1) while DSR recorded more net returns (Rs. 39, 121 ha-1) and benefit cost ratio (1.68). Transplanting increased uptake of nutrients by rice crop to the maximum of 99.4 kg N, 27.9 kg P and 107.3 kg K ha-1 as compared to DSR. TPR recorded the higher energy output (1, 48, 205 MJ ha-1), energy ratio (18.0) and energy productivity (0.69 kg MJ-1) than DSR. INM exhibited the highest mean grain (6.06 t ha-1) and straw yields (7.09 t ha-1), while the organic management showed at par of these values. The INM practice also fetched 50, 781 ha-1 and 7,470 ha-1 higher net returns and 0.84 and 0.04 higher benefit: cost ratio over organic practice and inorganic nutrition, respectively. The INM practice in rice crop resulted in the maximum N, P and K uptake. But, the inorganic and organic practice in isolation have similar uptake of nutrients by the crop in accordance with their almost similar yields. The minimum energy for raising rice crop was spent in organic practice, which generated maximum energy ratio (23.4) and energy productivity (0.87 kg MJ-1) followed by INM and inorganic practice. Thus, transplanting method of rice establishment with INM approach is a viable management practice for improving productivity, profitability, nutrient uptake and energy efficiency of rice in rice-groundnut cropping system in coastal Odisha.

Effects of two rice establishment methods namely, direct seeding (DSR) and transplanting (TPR) and three nutrient management practices in rice and three nutrient management practices in groundnut of rice (Oryza sativa L.)- groundnut (Arachis hypogaea L.) system were investigated. TPR produced 7.1 and 5.6% higher grain (5.75 t/ha) and straw (6.81 t/ha) yields than DSR with superior yield attributing characters. INM (green manuring + 50% STBN + 100% P2O5 + 100% K2O) enhanced grain and straw yields of rice by 13.3 and 10.0% over inorganic (100% STBF) and by 15.2 and 8.2% over organic (green manuring + 1/3rd STBN through vermicompost + 1/3rd STBN through neem oil cake) management practices, respectively. INM practice in groundnut (75% STBN + 25% STBN (FYM) + lime 0.2 LR + biofertilizers (Rhizobium + PSB) + 100% P2O5 + 100% K2O) also produced the highest pod (2.74 t/ha) and haulm (3.62 t/ha) yield, which were, respectively, 39.8 and 5.5% higher over 75% STBF and 20.2 and 1.4% more than 100% STBF. But, DSR resulted in higher system yield (12.7 t REY/ha), system productivity (34.7 kg REY/ha/day), energy productivity and accumulated heat use efficiency than TPR system. INM practice in rice showed maximum system yield, productivity and P and K balance whereas, organic approach resulted in higher N balance. INM in groundnut produced the maximum system yield, productivity, HUE and N balance, but 75% STBF showed maximum agro-meteorological indices, P and K balance in spite of lowest system yield and system productivity. Energy productivity and efficiency were higher with 100% STBF in groundnut. Bangladesh J. Bot. 51(3): 477-486, 2022 (September)

A field experiment was conducted in the Instructional Farm of the College of Agriculture, Odisha University of Agriculture and Technology, Bhubaneswar, India during 2017-18 to study the effect of rice establishment methods on phenophases, productivity, and profitability in rice- rice system. The experiment in kharif was laid out in a randomized block design with 3 treatments viz. direct seeded rice (DSR), non-puddled transplanting (NPTR), and puddled transplanting (PTR) with 3 replications whereas, in Rabi, these 3 establishment methods were reassigned within each treatment leading to 9 treatment combinations. Two promising rice varieties, cv. Swarna sub 1 and cv. Lalat were adopted in this experiment during kharif and rabi, respectively. Rabi rice under DSR-DSR matured 8 days earlier than PTR-PTR method, whereas the maximum grain yield (6.65 t ha-1) was recorded under the NPTR-PTR with the maximum harvest index of 0.52 which was 30.5% higher than DSR-DSR.The highest system yield (11.45 t ha-1) was recorded under the NPTR-PTR method of establishment which was 27.2% higher than the DSR-DSR method of establishment. The NPTR-PTR rice establishment also recorded the highest system gross return of Rs.1,79,785/- ha-1, the net return of Rs. 93,475/- ha-1, and B-C ratio of 2.1 against the total cost of cultivation of Rs. 86,310/- ha-1. Thus, the NPTR-PTR method of the establishment was found to be the best method so far as productivity and profitability are concerned.

The Changing climatic scenario is found as the most challenging issue to be faced by the farmers in future for attaining sustainable farm income. This study aimed to explore the projected climate change for Cuttack district of East and South Eastern Coastal plain agro-climatic zone of Odisha using four global climate change Representative Concentration Pathways (RCP) scenarios 2.6, 4.5, 6.0 and 8.5 for four future years 2030, 2050, 2070 and 2090. CMIP5 (Coupled Model Inter comparison Project Phase 5) was employed using bilinear interpolation for downscaling to generate these climate projections with included weather parameters i.e temperature, rainfall and solar radiation for the study area. The model results revealed that the RCP projections of climate change showed an increase in seasonal maximum temperature, minimum temperature and solar radiation and a decrease in the rainfall condition in future for Cuttack district of Odisha for the years 2030, 2050, 2070 and 2090 and there will be an maximum increase in seasonal maximum temperature by 2.56 o C and by 3.96 o C in seasonal minimum temperature in the year 2090 under RCP 8.5 scenario. Hence through the findings of the present investigation it is found that there is a need for farmers of Cuttack district of Odisha to follow necessary adaptation strategies in future to avoid the major risk caused to the agriculture production potential under the changing scenario of climate.