this post was submitted on 26 May 2024
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Our retention pond in our neighborhood has a lot of algae and problematic plant growth due to the surrounding farms and lawn runoff, so we're experimenting with a floating island to pull nutrients out before they can cause problems. This will also provide some interesting flowering plants, and more fish habitats.

Will be an interesting experiment to see what survives and what does poorly.

Zinnias, sunflowers, marigolds, and a few others are in net pots, inserted into cutouts in EVA foam mats.

Design is from:
http://www.beemats.com/

More reading:
https://arstechnica.com/science/2024/02/flowers-grown-floating-on-polluted-waterways-can-help-clean-up-nutrient-runoff/

https://www.sciencedirect.com/science/article/pii/S2666765723000637?via%3Dihub

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[–] SchmidtGenetics@lemmy.world 3 points 5 months ago* (last edited 5 months ago) (2 children)

What a fascinating idea!

Iirc, there is some plants that are better at pulling the crap out of soil, should be the same for water. So maybe research some of those for options?

I’ve read cannabis/hemp can be grown to remediate some places.

I’ll give the links a read when I get time later, thanks growmie.

Linky for cannabis

[–] mipadaitu@lemmy.world 13 points 5 months ago (1 children)

Love it, but we're not as concerned about metals or toxins as we are about excess nutrients.

The papers I listed have plants that they've been using for their remediation, and we're following those lists. I know some of the researchers on those projects, and we'll modify our plant list based on any changes in their recommendations.

[–] rdyoung@lemmy.world 5 points 5 months ago (3 children)

Yep, hemp has been long known to rejuvenate soil. It's been used for decades (or more) as a rotation crop to restore soil after something like corn or wheat sucks up all of the nutrients.

[–] mipadaitu@lemmy.world 3 points 5 months ago* (last edited 5 months ago) (1 children)
[–] SchmidtGenetics@lemmy.world 1 points 5 months ago* (last edited 5 months ago) (1 children)

For soil rejuvenation you mulch it back into the soil for compost I thought, you can’t do that if you’re using it for remediation to pull stuff out of the soil as you would be just be putting it right back in again.

[–] rdyoung@lemmy.world 4 points 5 months ago (1 children)

You are correct but I think hemp is similar to clover in that there is some symbiotic relationship with other organisms that help rejuvenate the soil even if you don't mulch it back it in. I could be wrong here but I know that plenty of farmers grow hemp between other crops and likely don't "waste" it by mulching it back in.

If you are looking to pull bad stuff out of water, I'd think that growing anything that would hold onto the bad stuff as it falls to the bottom of the river or lake and stores it there would be a solution as well as harvesting and transporting it elsewhere.

[–] mipadaitu@lemmy.world 3 points 5 months ago (1 children)

There would be some benefits to growing hemp, but in our situation, it wouldn't apply. We aren't looking to add nutrients to the water, we're looking to remove it.

We aren't concerned about other toxins that the hemp would absorb, so while it might be useful in some areas with more industrial pollution, it doesn't apply to this project.

[–] SplashJackson@lemmy.ca 1 points 5 months ago (1 children)

Plus you can make ropes out of it which are good for sailing or bondage