|Wood trays with 2" blocks awaiting Micros|
My favorite company, Seeds of Change, uses the amazing web-bottomed 17"x17" tray with a 2" lip. If you can find these cheaper, they're great, I love them and will use them in long greenhouses for micro salad production. The open bottoms air prune the roots and hold a maximum of 64 2" blocks. This is first choice among the salvageable greenhouse freebies. Then, you've got the most popular flat tray in the U.S., the 1020. It comes with holes or no holes, and we like the no holes so that water can sit in the bottom of the grooves for reserves and help keep blocks moist, but we LOVE the bottom mesh trays for air pruning. 1020's are cheap and easy and you shouldn't have to buy them, if you can find them free, almost everywhere! The major downfalls of these two favorites is that they will eventually break, and end up in the garbage, or hopefully, in the recycled bin. So besides "gardening with garbage", as the Research Farm puts it, what's next, Guru?
Next, this style comes from the Undeniable Ambassador of Soil Blocking, Eliot Coleman who brought soil block makers to the US agriculture scene, and his market farming techniques for masters. They're the old-fashioned style wood trays, made from 1/2" stock plywood bottoms and three sides of 1"x3" wood in any length and size you can dream up for your operation. This will create a custom system for all those handy enough, and willing to make them. The 3" side height is perfect for allowing the seeds to sprout while they can be stacked up as high as you like. See first photo. We still use these trays, because, frankly, we trained ourselves under the Eliot Coleman system, and the trays are lasting 8 years now. We did paint them with a white latex paint for light reflection and water resistance. Make them out of cedar or redwood if you've got it. Since, this is a research farm, new options and methods are being trialed, and we have hit on some real winners. Let's track them down in the order of least expensive with the most work, to the most expensive with the least amount of work involved. (Why is it always like that?) (And, it goes for all of our commercial stand-up soil block makers we sell!)
Let's start with the stackable dairy crates with mostly three sides that stack up on one another. They're great! IF YOU CAN FIND THEM!
Next, again, an Eliot Coleman tip, the bread trays and carts found behind grocery stores and bakery outlets. They're top notched, first rate, professional systems, IF YOU CAN GET THE OWNER TO PART WITH THEM. Hunt them down all over town if you need to as they are well worth the wait, the hunt, the patience and the few bucks to bribe the owner to "depart from this one with the little rust". See photo.
Next comes the hybrid system for innovating farmers and gardeners: The wood sided expanded galvanized metal lathe bottomed tray. See photo. This is a fantastic system for the 'art of soil blocking", which is to air prune all sides for the final elimination of transplant shock. This way is found no where in the plastic pot culture system no matter what they tell you! You can replace the spendy lathe with quail fencing, poly covered fencing, quality gauge hardware cloth, or the new 2'x4' plastic bench tops or lapping animal cage bottoms, found at http://www.farmtek.com/, cut in thirds and either rimmed with wood or not.
Down the line we now have stackable fiberglass trays used in the food industry or hydroponic systems. Of course, they are the best, but they will cost you a year's worth of home-grown vegetables at your farmer's market. This is a great system for long term investments in soil block equipment used for serious systematic gourmet market growers. They simply last forever and can withstand repeated abuse and harsh climactic conditions.