Assessment of the impacts of climate change and brackish irrigation water on rice productivity and evaluation of adaptation measures in Ca Mau province, Vietnam

Abstract

This study investigates the temporal impacts of climate change on rice yield for summer-autumn (SA) and autumn-winter (AW) cropping pattern along with implication of brackish irrigation water for the SA season. Furthermore, evaluation of different agro-adaptations to overcome negative impacts of climate change was also done for Ca Mau province of Vietnam. Climatic variables were derived from six general circulation models which were further bias corrected at Ca Mau city station for three future time periods (2025s, 2055s, and 2085s). Calibrated AquaCrop 4.0 was used to project the future rice yield under climate change and different salinity levels in irrigation water. Simulation shows a decline in rice yield ranging from 1.60 to 23.69 % and 8.06 to 20.15 % by 2085s relative to baseline climate for A2 and B2 scenarios respectively in the case of the SA cropping season. However, an increase in rice yield ranging from 3.29 to 12.35 % and 6.64 to 17.23 % is observed for the corresponding time period and scenarios. Further simulations for the SA cropping season under climate change and increasing salinity in irrigation water suggest an insignificant increase in yield relative to the yield obtained without irrigation. Moreover, proper management practices, namely forward and early shifts in transplanting dates along with increasing fertilizer application rates, are observed to be beneficial to enhance the rice yield under climate change.

The adoption and impact of engineering‐type measures to address climate change: evidence from the major grain‐producing areas in China

“…Their results indicate that crop yields would decline if faced with realistic future climate change, but also that the adoption for appropriate adaptive measures could offset this yield loss and even (potentially) increase crop yields (Babel and Turyatunga ; Deb et al . ).…”

Managing Water and Soils to Achieve Adaptation and Reduce Methane Emissions and Arsenic Contamination in Asian Rice Production

“…Deb et al [103] examine climate change scenarios and rice production in Ca Mau Province, in the Mekong Delta of Vietnam. They suggest that a delay in the date of transplanting will offset a portion of the expected decline in rice yields in the summer-autumn season, while an earlier date of transplanting will enhance rice yields in the autumn-winter season.…”

“…These delays shift the weather-sensitive plant stages, such as flowering and reproduction, to periods with cooler temperatures and higher rainfall, thus increasing the likelihood of successful pollination and grain development. Advancing the date of transplanting in the autumn-winter season increases the likelihood of receiving sufficient rainfall during critical plant stages, while also minimizing the probability of chilling injury during anthesis and maturity [103].…”

Simulation of Crop Growth and Water-Saving Irrigation Scenarios for Lettuce: A Monsoon-Climate Case Study in Kampong Chhnang, Cambodia

“…It is considered as a valuable tool for improving irrigation water productivity in crop production planning [6,50]. AquaCrop has been calibrated and parameterised to various crops under various environmental and irrigation conditions, including barley [51], soybean [52], sunflower [53], cotton [54,55], corn [56], sugar beet [57], wheat [58,59], potato [60,61], cabbage [62], and rice [63]. However, this has not yet been done in the case of lettuce.…”