Which strategy will promote maximum vertical growth of bean plants in a hydroponic system with light coming from one side?
Rotate the plants regularly for even light exposure
Plant shoots show positive phototropism: they bend towards light. The hormone auxin collects on the shaded side of the shoot and makes the cells there grow longer, so a shoot lit from one side curves towards that side.
If the bean plants are rotated regularly, every side of the shoot gets light in turn. No side stays shaded for long, the bending effect is cancelled out and the shoots grow straight upwards, giving the maximum vertical growth.
Keeping the plants stationary under one-sided light makes them bend towards the light rather than grow straight up. Extra nutrients do not correct the bending, and artificial wind only affects stem strength, not the direction of growth.
Hence, Rotate the plants regularly for even light exposure.
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