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The crop lifeguard aims to protect crops in areas where floods and droughts are frequent, especially for cruciferous crops with shallow roots. During floods, foam material allows the unit to float on the surface, thus avoiding the crops to be submerged. Each unit could also store some water, which can be rehydrated by slow-release sponges during dry seasons. Besides, the unit design provides farmers with more flexibility, they can combine as many units as they want, this also enables batch management of all crops.