Aquaponics is the combination of aquaculture and hydroponics. In these semi-closed systems, water flows between an aquaculture fish tank and a plant growing bed.
Hydroponics is a method of cultivation where plants are grown in soilless media using a water and nutrient mixture. It kindles hope for urban farming.
The concept of drip irrigation is trickling water slowly to roots. It saves water by 30-50% compared to sprinklers and prevents fungal diseases.