Space pioneers who want to grow their own veg would probably be better off on Mars than on the moon. This conclusion was drawn by Alterra ecologist Wieger Wamelink after gardening tests on Martian and moon soils.
The ecologist monitored what happened closely over 50 days. The Martian soil proved the most fertile – even more fertile than the Rhine sand. All the seeds germinated in the Martian soil, but rye, carrots, red fescue and cress did best. The biomass yield (growth) was better on the Martian soil than on the Rhine sand, too. Wamelink: ‘This is probably because the Martian soil retains moisture better. And it seems that there are enough minerals in the soil. The Martian soil we used is pretty much like the Loess soils we know from Limburg.’
On the basis of Wamlink’s trials, gardening on the moon seems less promising. The plants germinated but then failed to grow much. The best-case scenario was that they did not die. But many plants did not survive the experiment. Wamelink blames this on the alkaline moon soils (pH 9). ‘What is more, there is a lot of aluminium in moon soil, and that is basically toxic for plants.’
Wamelink would like to continue with his experiments. ‘I would love to take this further. It is nice and extremely innovative research. I have approached NASA and they are keen to be involved.’ A VIDI grant application is in the pipeline. In follow-up research, Wamelink would like to try out various nutrient solutions and light conditions. The light on other planets differs from the light on earth in spectrum, daylight hours and intensity.
Vegetable plots on other planets are not as much something out of science fiction as they would seem. NASA has plans for conducting germination and growth tests on the moon. This experiment may take place next year when the unmanned Moon Express goes to the moon.