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Kratky method
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<p>The Kratky method is a <a href="/facts/Passive_hydroponics/5UUcACDc">passive hydroponic</a> technique for growing plants suspended above a reservoir of nutrient-rich water. Because it is a non-circulating technique, no additional inputs of water or nutrients are needed after the original application, and no electricity, pumps, or water and oxygen circulation systems are required. The Kratky method has applications both for commercial food production and as a small-scale and low-maintenance technique for home growers. It has been described as "the simplest hydroponic system." </p>