Hydroponic culture of lettuce

Hydroponic culture of lettuce

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Credit: BLAIR SEITZ/SCIENCE PHOTO LIBRARY

Caption: 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.

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Keywords: agricultural, agriculture, cultivation, farming, greenhouse, hydroponic, hydroponic culture, hydroponics, land use, lettuce, plant

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