Question: Hydroponics has been shown to be a successful technique for growing of plants. Yet most of the crops are still grown on land. Why?
Hydroponics is the technique where the plants are grown in mineral nutrient instead of soil. This requires the addition of mineral regularly and change of water. Examples like tomato, cucumber etc culture like this. Most of the crops are grown still in the land because minerals are already present in the soil there is no need of adding extra into it.