Fertilizer tanks and automatic feeding system “Karaca” are used both for watering greenhouses and for watering open land. The mix of fertilizers and acids is automatically transferred to the solution unit as needed. When the sensor sensors fix a sufficient level of incoming substances, the flow is blocked by a two-way valve. This system achieves the most accurate dosing. Due to pre-mixing water with fertilizers it is possible to obtain the most uniform nutrient solution.