Red onion is the main agricultural product of Vinh Chau, Soc Trang province. At present, the area of red onion cultivation in Vinh Chau town is over 6,000ha. Each year, farmers cultivate 3-4 continuous vegetables and other short-term (V&OST) crops (Vietnamese: hoa màu), in dry seasons, using mainly groundwater for irrigation. In recent years, due to impacts of climate change, the scarcity of irrigation water has become more and more acute, proper water supply measures for crops are being paid attention for the implementation by localities. The project titled “Continual improvement and transferring of the cultivating models of effective land and water resource use to maintain efficient sustainable commercial production of unions on sandy land in Vinh Chau district, Soc Trang province” has been funded by the GEF Small Grants Programme. This was Phase 2 (2015-2017), a follow-up to the Phase 1 (2010-2012) of the CBA Vinh Chau project, with the aim to continue testing integrated cultivation measures in order to perfect, transfer and replicate the irrigation water saving model for red onion cultivation and the model of microorganism application in the production of bio-organic fertilizer. This fertilizer is applied to replenish and improve cultivation soil, help maintaining effective production of rotational crops on Vinh Chau sand dunes taking into consideration impacts of drought, saltwater intrusion and roundwater level decline caused by climate changes.