MODEL RELEASED A worker tending lettuce seedlings in a hydroponic culture greenhouse. Hydroponics is the cultivation of plants without soil. Instead,the roots of the plant are immersed in a trough through which nutrient-rich water trickles. Hydroponics was first proposed in the 1860s,but reached commercial scales in the 1930s,particularly in America | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Seitz, Blair |
Bildgröße: | 4939 px × 3310 px |
Modell-Rechte: | vorhanden |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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