I have grown them hydroponically, also in a tray with 1/4 inch of dirt, and also in a tray with no growing medium. Heres a few good tips that work whether sprouting for yourself or your animals!
Seed Prep
Put into a strainer bucket or container.
Oats create amazingly starchy water, so it can help to Prep Oats before Soaking, by running water through them for 30-60 seconds. This won't remove all the starch, but any less is good - as you'll see shortly.
Transfer your rinsed seeds (if necessary) into a bowl.
Add 2-3 times as much cool (60°-70°) water.
Mix seeds up to assure even water contact for all.
Allow seeds to Soak for 30 Minutes.
Note: Oats take up all the water they need quickly, that is why their Soak time is so short. They get waterlogged if soaked too long, and may never sprout - so - Don't over-soak them!
Empty the seeds into your bucket/container
Drain off the soak water.
You may water plants or use it in stock if you like - it has nutrients in it.
Rinse thoroughly with cool (60°-70°) water.
Drain thoroughly!
Note: Oats have starchy water and is amazingly thick! They won't sprout too well unless you get rid of it - so Rinse and Rinse and Rinse until the water runs clear and is less viscous then at first. It can take a little while - but don't skimp. 4 or 5 is generally our number of cycles.
Every Rinse is the same when dealing with Oats: Rinse and Rinse and Rinse until the water runs clear.
Set your bucket/container anywhere out of direct sunlight and at room temperature (70° is optimal) between Rinses.
This is where your sprouts do their growing. We use a counter top - in the corner of our kitchen, but where the sprouter won't get knocked over by cats, dogs, kids or us.
We don't mind the indirect sunlight or the 150 watts of incandescent light, because light just does not matter much.
A plant can only perform photosynthesis when it has leaves. Until then light has little if any effect. They also happen to like air-circulation, so don't hide your sprouts.
Rinse and Drain again in 8-12 hours.
And, perhaps one more...
Rinse and Drain in 8-12 hours.
And, possibly once more...
Rinse and Drain in 8-12 hours.
We usually stop here (or sooner if we have any root at all). We like our Grain Sprouts very small.
Depending on your climate and the time of year you are sprouting and most importantly your personal preference -
You may Rinse and Drain again at 8-12 hour intervals for several days.
However - we prefer to sprout only to the point where most of the seeds have sprouted tiny (1/16 - 1/4 inch) roots. That is typically after just 2 or 3 Rinse and Drain cycles, though it can happen after just one.
As always, we suggest that you taste your crop at EVERY Rinse - including the very first - just after the Soak period.
The soaked seeds are already alive and though they may not be their most nutritious they are very close. We're talking seriously nutritious - they are already without enzyme inhibitors (a very good thing indeed) so they'll digest themselves and nourish your cells without requiring anything from your body!
Grow them for as long as you like (as long as you continue to Rinse and Drain every 8-12 hours) and find out for yourself when they are most delicious!
If you grow for more than a couple days, you'll have Grass growing (on your Oats) as well as roots.
Experiment! Have Fun! It's All Good!
Harvest
Your sprouts are done 8-12 hours after your final Rinse.
Be sure to Drain them as thoroughly as possible after that final Rinse.
sproutpeople.org/seeds/oatsgroats.html