Testing soil-like substrate for growing plants in bioregenerative life support systems
| Autor: | Sofya Ushakova, V. Yu. Dorofeev, J. B. Gros, R.A. Karnachuk, L.S. Tirranen, I.G. Zolotukhin, N.S. Manukovsky, Ch. Lasseur, Alexander A. Tikhomirov, V.S. Kovalev |
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| Rok vydání: | 2005 |
| Předmět: |
Mucor
chemistry.chemical_classification Atmospheric Science integumentary system biology food and beverages Aerospace Engineering Biomass Astronomy and Astrophysics Straw biology.organism_classification Hydroponics Light intensity Horticulture Geophysics chemistry Space and Planetary Science Trichoderma General Earth and Planetary Sciences Organic matter Cladosporium |
| Zdroj: | Advances in Space Research. 36:1312-1318 |
| ISSN: | 0273-1177 |
| Popis: | We studied soil-like substrate (SLS) as a potential candidate for plant cultivation in bioregenerative life support systems (BLSS). The SLS was obtained by successive conversion of wheat straw by oyster mushrooms and worms. Mature SLS contained 9.5% humic acids and 4.9% fulvic acids. First, it was shown that wheat, bean and cucumber yields as well as radish yields when cultivated on mature SLS were comparable to yields obtained on a neutral substrate (expanded clay aggregate) under hydroponics. Second, the possibility of increasing wheat and radish yields on the SLS was assessed at three levels of light intensity: 690, 920 and 1150 μmol m−2 s−1 of photosynthetically active radiation (PAR). The highest wheat yield was obtained at 920 μmol m−2 s−1, while radish yield increased steadily with increasing light intensity. Third, long-term SLS fertility was tested in a BLSS model with mineral and organic matter recycling. Eight cycles of wheat and 13 cycles of radish cultivation were carried out on the SLS in the experimental system. Correlation coefficients between SLS nitrogen content and total wheat biomass and grain yield were 0.92 and 0.97, respectively, and correlation coefficients between nitrogen content and total radish biomass and edible root yield were 0.88 and 0.87, respectively. Changes in hormone content (auxins, gibberellins, cytokinins and abscisic acid) in the SLS during matter recycling did not reduce plant productivity. Quantitative and species compositions of the SLS and irrigation water microflora were also investigated. Microbial community analysis of the SLS showed bacteria from Bacillus, Pseudomonas, Proteus, Nocardia, Mycobacterium, Arthrobacter and Enterobacter genera, and fungi from Trichoderma, Penicillium, Fusarium, Aspergillus, Mucor, Botrytis, and Cladosporium genera. |
| Databáze: | OpenAIRE |
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