Evaluation of adaptation strategies to mitigate the impacts of climate change in rice planting and subsequent sowing (Soybean) in Rasht
2023
Sabziparvar, Ali Akbar | Seifzadeh Momensaraei, Alireza
Long term changes in climate parameters within the next few decades may affect the yield of many agricultural crops. In this aspect, few studies have been conducted on national scale to evaluate the proper strategies against the negative impacts of climate change for important crops. In the present study, different crop managements including changes in irrigation period, fertilizer volume and planting date in rice and soybean were simulated for two time-scale of near future (2021-2035) and far future (2036-2050) and the results evaluated as an adaptation strategy to oppose against the negative impact of climate change. We used downscaled meteorological parameters of MarkSimGCM data based on the output of three General Circulation Models (HadGEM2-ES, CSIRO-Mk3-6-0, GFDL-ESM2M) under three different RCP scenarios (RCP 2.6, 4.5, 8.5). In addition, we applied a 12-year phenological dataset of Hashemi and Alikazemi rice cultivars beside a two-year field data of Williams and Hobbit soybean cultivars and the simulations were carried out by DSSAT plant model. The results showed that changing the planting date from 10th of May to 30th of April in the RCP 8.5 scenario and Hashemi cultivar could improve the crop yield by 18.9% in the 5-day periodic irrigation, compared to flood irrigation. Moreover, the advance of planting date for 20 and 30 days will improve the crop yield, but is not effective as the 10-day acceleration. For far future window (2036-2050) and RCP 2.6 scenario, implementing the F3 fertilizer will improve the crop yield by 10.7%. Among the aforesaid strategies, the maximum yield increase was found under fertilizer managements and RCP 2.6 scenario. In general, although climate change will reduce the studied crop yields by 2050, but could compensate a part of this yield reduction, if appropriate crop managements is adopted.
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