| | Hydroponics covers an extremely wide technological range. Some commercial growers use the most advanced computer controlled environments micro-managing the entire environment of the plants, including the water, nutrient, atmospheric gases, temperature, winds, light levels and spectra. In contrast, aid organisations sometimes provide disaster survivors in under developed locations with “self sufficiency” systems consisting of a flood & drain table with coir medium, seeds or seedlings, and a bucket for liquid manure. <ref>Practical Hydroponics and Greenhouses</ref> | | Hydroponics covers an extremely wide technological range. Some commercial growers use the most advanced computer controlled environments micro-managing the entire environment of the plants, including the water, nutrient, atmospheric gases, temperature, winds, light levels and spectra. In contrast, aid organisations sometimes provide disaster survivors in under developed locations with “self sufficiency” systems consisting of a flood & drain table with coir medium, seeds or seedlings, and a bucket for liquid manure. <ref>Practical Hydroponics and Greenhouses</ref> |