Microgreens Experiment: Hemp Mat vs Meadowlark Garden Soil

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Meadowlark

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In the referenced thread on microgreens, we discussed mediums.

Rather than poach on @Tundra20 's good thread, I'm starting one to record what happens when identical seeds (in this case radish) are started for greens in hemp mat vs my garden soil. Hemp on the left vs Meadowlark on the right. If interested stay tuned for progress.

microgreens experiment.JPG

 

pepper2.0

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Just curious what liquid fertilizer you used for the hemp?

The visual outcome is already clear due to the countless times people have done this on YouTube and all across the four corners of the online universe.. it still always comes down to personal preference. So is this just to see what way you prefer or is the goal to do what most others haven't done and send samples of each to a lab to be tested and prove the difference in vitamins, minerals, antioxidants etc per serving? That would actually be a possible game changer to microgreen home growers.
 

Meadowlark

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Just curious what liquid fertilizer you used for the hemp?
No fertilizers in either.

...The visual outcome is already clear due to the countless times people have done this on YouTube and all across the four corners of the online universe..
Forgive me but I like to do my own research hands-on. The "four corners" hasn't used my soil and that is what I'm testing.

...So is this just to see what way you prefer or is the goal to do what most others haven't done and send samples of each to a lab
Both.
 

pepper2.0

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No fertilizers in either.
That's like experimenting with a gas engine vs an electric engine but not adding gas lol. But, it's your experiment so your choice if you want to do it right or not.

I just assumed since the other thread you said something about wanting the full nutritional benefits that your soil provides, that's what this was based on. I assumed wrong I guess, sorry for that.
 

Tundra20

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im curious with what u find cant trust all those u tubers cause thats mostly what they good at videoing except for a few but idont watch whole lot of them either

ive nver used hemp mats mainly due to something else i gotta order keep up with i have soil but very curious

next is ur water very important i use water from my fish stock tanks seems to wrk well once bottom feeding process starts
 

pepper2.0

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im curious with what u find cant trust all those u tubers cause thats mostly what they good at videoing except for a few but idont watch whole lot of them either

ive nver used hemp mats mainly due to something else i gotta order keep up with i have soil but very curious

next is ur water very important i use water from my fish stock tanks seems to wrk well once bottom feeding process starts
I can't see Meadowlark throwing his Meadowlark soil under the bus anymore than YouTubers who promote soil or hemp mats lol. It's common sense to use fertilizer when using hemp mats, there is lots of good organic liquid fertilizers available.. Ocean Solution is one of the popular ones for microgreen growers. But that fish tank water sounds like a great idea, and free if you have it.
 

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Who can answer these questions?

When do seedlings start drawing nutrients from the soil/fertilizers?

And

How long after the seedlings germinate do the true leaf emerge, since that is when (as I understand it) the optimum time to harvest microgreens?
 

roadrunner

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I just got these two answers from AI. Granted I take AI with a grain of salt, but it's a start.

How long after germination to harvest microgreens: You typically harvest microgreens 7-21 days after planting, usually when their first cotyledons (seed leaves) are fully developed and the first set of true leaves begins to emerge, though timing varies by variety, with many quick growers ready in about 10 days. The ideal time is when they reach 1.5-2 inches tall, offering the best balance of flavor and nutrition before they get too tall or develop bitter true leaves, but you can experiment for different tastes.


How long after germination do plants start taking nutrients from the soil: Seedlings rely on food stored in the seed (cotyledons) for the first week or so after germination, but they start needing supplemental nutrients from the soil once their first set of true leaves appear, which is typically around 1-2 weeks after sprouting, requiring a dilute fertilizer or nutrient-rich soil mix to support their rapid growth.


I'm thinking of another question.....
 

roadrunner

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Got it...

When are microgreens the most nutrient dense after germination: Microgreens are most nutrient-dense when harvested young, typically 7 to 14 days after germination, right after their first set of true leaves appears, as they concentrate vitamins, antioxidants, and minerals during their rapid growth phase. While you can eat them slightly earlier (around 5-8 days as sprouts), the peak nutrient density occurs when the cotyledons are fully developed, before they become mature plants.


I see a little bit of contradiction. Where does the extra nutrients come from before the first true leaf/leaves are appear?
Supposedly they don't take nutrients up until photosynthesis, which happens after the true leaves appear. o_O
 

pepper2.0

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Got it...

When are microgreens the most nutrient dense after germination: Microgreens are most nutrient-dense when harvested young, typically 7 to 14 days after germination, right after their first set of true leaves appears, as they concentrate vitamins, antioxidants, and minerals during their rapid growth phase. While you can eat them slightly earlier (around 5-8 days as sprouts), the peak nutrient density occurs when the cotyledons are fully developed, before they become mature plants.


I see a little bit of contradiction. Where does the extra nutrients come from before the first true leaf/leaves are appear?
Supposedly they don't take nutrients up until photosynthesis, which happens after the true leaves appear. o_O
Good question. I do know that hemp seeds have lots of vitamins, minerals, omega 3 etc, I used to eat hemp hearts with chia seeds. So depending on the seed, but they all have what is needed to start them off as seedlings.

It's not that you can't grow microgreens without fertilizer but if you want the best results then you need it.
 

pepper2.0

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Got it...

When are microgreens the most nutrient dense after germination: Microgreens are most nutrient-dense when harvested young, typically 7 to 14 days after germination, right after their first set of true leaves appears, as they concentrate vitamins, antioxidants, and minerals during their rapid growth phase. While you can eat them slightly earlier (around 5-8 days as sprouts), the peak nutrient density occurs when the cotyledons are fully developed, before they become mature plants.


I see a little bit of contradiction. Where does the extra nutrients come from before the first true leaf/leaves are appear?
Supposedly they don't take nutrients up until photosynthesis, which happens after the true leaves appear. o_O
I did a ton of digging on it.. I can provide the studies backing it up to show it's not just a random AI concoction. Turns out for the maximum nutritional value the time to harvest is the moment you see the start of true leaves. And until then all the growth comes from the seeds, not from the soil/fertilizer or water. When the true leaves start growing the plant switches gears and starts dropping in nutritional benefits and becomes dependent on the soil/fertilizer for nutrients. So because some microgreens growers harvest after to get a better yield, it basically becomes baby greens instead of microgreens.

It's like a chick in an egg using the yolk until it hatches. What it feeds on determines it's health and growth rate.
 

Meadowlark

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im curious with what u find cant trust all those u tubers cause thats mostly what they good at videoing except for a few but idont watch whole lot of them either

Absolutely agree on the "tubers". They almost always have an agenda and making money is almost always foremost on that agenda.

...next is ur water very important i use water from my fish stock tanks seems to wrk well once bottom feeding process starts

Yes, I use rainwater exclusively on all my seedlings.

@tundra if you see anything you would change in the following, please let me know.

My plan for the experiment is based on two facts and two parts:

The two facts:

1) Microgreens are most nutrient-dense when harvested young, typically 7 to 14 days after germination, right after their first set of true leaves appears

2) Seedlings rely on food stored in the seed (cotyledons) for the first week or so after germination

Part 1: Initial Eval

1) and 2) above agree on 7 days. That is when I harvested my first crop of microgreens (turnips) from my soil and they were terrific.

I'll evaluate at 7 days. Probably will send samples to lab at that point for nutrient analysis. The comparison will show what differences if any exists at that point between the two mediums.

Part 2: best medium for increasing nutrient density

A couple of more facts:

1) the hemp mat is pretty much void of any nutrients.

2) my soil is " No N-P-K required" meaning has full range of nutrients both macro and micro.

There would be no mystery in this going further without adding nutrients to the hemp mat. Without it, it will fail miserably IMO.

On the other hand, I fully expect my soil to provide everything the seedlings need without any further enhancements.

Hence, my plan for Part 2, again depending on what I find from Part 1, is to provide a fish emulsion/rainwater treatment to the remaining seedlings on the Hemp Mat.

On the Meadowlark mat, 1/2 of the remaining seedlings will receive nothing but rainwater and the other half will receive the same fish emulsion/rainwater treatment as the Hemp mat.

My tentative plan for Part 2 is to then send three samples to the lab after about 14 days:

1) Hemp mat seedlings fed fish emulsion

2) Meadowlark soil seedlings fed same fish emulsion and

3) Meadowlark soil seedlings feed nothing but what they get from the soil.

@tundra, I'd be interested in your thoughts on this as you have the most hands on experience on microgreens.

The results of this part will tell me how efficient my soil is at doing the job just as it is. It will also tell me if I need to add anything to it during that second week. Further, it will give a comparison to Hemp mat to help determine if they are of any net value compared to my soil.
 

Meadowlark

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I just got these two answers from AI. Granted I take AI with a grain of salt, but it's a start.
Well, I got similar answers so going with that. Thanks for the info.
 

Meadowlark

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Microgreen Medium Comparison Plan:
 

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