Nutrient Cycling!
© a.k.a. MBR
In a perfect world a closed system could function indefinitely. You would apply nutrients, light, CO2, & water to the system and get plants out without any waste being produced. In reality, the system will likely develop an imbalance and require that corrective measures be applied. Where water conservation and pollution reduction are necessary &/or possible, & where secondary ion depletion can be imposed on nutrient effluent, consumption can be facilitated in an environmentally symbiotic fashion.
Depending on circumstances allowances, nutrient solutions may be continuously utilized by recirculating the same batch indefinitely on crop plants until refreshing is necessary when the old batch is optimally "filtered" through ornamental or other crops to minimize secondary environmental impact, or fresh mixtures of the solution are applied to the plants during subsequent fertilizer application with any effluent being used as described above.
Reverse osmosis filters and other types of water purification systems allow for emergency or routine water management control. This control can vastly elongate nutrient replenishment deferral times and reduce water requirements.
Tissue and fertilizer solution sampling are commonly used to perfect nutrient application recipës.
Certain regimes have been applied successfully where nutrients are applied in a one-way-street fashion where all moisture applied is to be processed by the plants without allowing for recirculaition or expulsion, but these routines can be difficult to manage as evapo-transpiration rates are often difficult to foresee or predict in unison with nutrient level maintenance. Nutrient deficiencies &/or toxicity symptoms are risks which can be managed.
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