Osmosis
Osmosis refers diffusion of water molecules through a semipermeable membrane from a place of higher water concentration to a place of lower water concentration until the concentration on both sides is equal.
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It is the same principle that plants absorb water from the soil. A low concentration of water in the soil is transferred to the interior of the plant at high concentrations by osmosis.
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Therefore, if the concentration of the fertilizer is too high, the water inside the plant will come out.