APPARATUS FOR CONTROLLING LIQUID FERTILIZER SPRINKLING FOR HYDROPONIC CULTURE

摘要

PURPOSE:To improve the environment condition in the rhizosphere of a plant, by discharging a residence liquid from a liquid reservoir with a metering pump in excess and restoring the liquid level in the liquid reservoir by sprinkling. CONSTITUTION:When the water level in a liquid reservoir 2 is lowered by a specific height by the evaporation from an artificial medium 4 in a tray 1, a sprinkle starting signal is transmitted from an electrode 9. The reserved liquid is discharged from the liquid reservoir in excess with a metering pump 11 to lower the liquid level in the reservoir. The lowered liquid level is restored to the original level by sprinkling. Excess fertilizer component or residual accompanied ion, etc., can be washed off by the excess sprinkling.