Increased BLSS closure using mineralized human waste in plant cultivation on a neutral substrate

Details Increased BLSS closure using mineralized human waste in plant cultivation on a neutral substrate Increased BLSS closure using mineralized human waste in plant cultivation on a neutral substrate

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009adspr..44..971u&link_type=abstract

Advances in Space Research, Volume 44, Issue 8, p. 971-978.

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The purpose of this work was to study the full-scale potential use of human mineralized waste (feces and urine) as a source of mineral elements for plant cultivation in a biological life support system (BLSS). Plants that are potential candidates for a photosynthesizing link were grown on a neutral solution containing human mineralized waste. Spring wheat Triticum aestivum L., peas Pisum sativum L. Ambrosia cultivar and leaf lettuce Lactuca sativa L., Vitaminny variety, were used. The plants were grown hydroponically on expanded clay aggregates in a vegetation chamber in constant environmental conditions. During plant growth, a determined amount of human mineralized waste was added daily to the nutrient solution. The nutrient solution remained unchanged throughout the vegetation period. Estimated plant requirements for macro-elements were based on a total biological productivity of 0.04 kg day-1 m-2. As the plant requirements for potassium exceeded the potassium content of human waste, a water extract of wheat straw containing the required amount of potassium was added to the nutrient solution. The Knop’s solution was used in the control experiments. The experimental and control plants showed no significant differences in state or productivity of their photosynthetic apparatus. A small decrease in total productivity of the experimental plants was observed, which might result in some reduction of О2 production in a BLSS.

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