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| International Agrophysics |
| wydawca: | Instytut Agrofizyki
im. B. Dobrzańskiego
PAN
w Lublinie |
| ISSN: |
0236-8722 |
vol. 11, nr. 3 (1997)
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poprzedni artykuł wróć do listy artykułów następny artykuł
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A comparison of oxygen diffusion rates in sand moistened with water or peg 20000 solution
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| (pobierz wersję PDF )
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Hiller S., Dexter A.R.
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Soil Science Group, Silsoe Research Institute, Wrest Park, Silsoe, Bedford, MK45 4HS, UK |
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vol. 11 (1997), nr. 3,
pp. 173-176
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streszczenie
Oxygen diffusion rates (ODR) were measured in water/sand/air and PEG solution/sand/air mixtures, spanning a range of liquid/solid/air volume ratios. Replacement of water with PEG solution as the liquid phase was found to reduce the ODR within a given mixture by a factor of approximately two. ODR values were compared with limiting values for plant emergence quoted in another study. It was concluded that PEG solutions could be used to control the osmotic potential of a sandy growth medium without adversely affecting seed germination due to oxygen starvation, providing that the pore volume was less than 70% occupied with liquid.
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słowa kluczowe
ODR, PEG solutions, water/sand/air mixtures
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