Sprouts!
The seed cabinet is working great after a couple of operator hiccups.
Initially I had rigid foam insulation on the front and decided to replace it with some double-wall poly I scrounged so the sprouts could get some sunlight. After a week of overcast skies the sun came out and heated the cabinet somewhere over 120* according to the recording thermometer - I thought I'd cooked $40 worth of seeds.
Although spotty in a couple of places just about everything has germinated - I may have cooked some of the cabbage a bit early but I think we're going to be OK.
Then just place one seed in the little dimple in the top of the blocks (you can sort of see it in the inset photo) and cover with just a very light sprinkling of soil. Part of the deal with soil blocks is that the growing roots won't grow out into the air but instead wait till the block is planted into a container. If so much soil is used that the spaces between the blocks is filled the roots just continue growing and intertwine and generally make a mess.
Heating
Here is the working part of the cabinet.
You can see the thermocouple (the temp sensor portion of the thermostat) is buried in some soil and covered with a square of plastic to keep the soil damp and the same temperature as the soil blocks. If it were to be just dangling in the open air it would be cooler than the soil blocks and make the heat mat stay too hot.
I use a recording thermometer, which of course, records the highest and lowest temperatures. Obviously it doesn't do any good if you've already cooked or frozen your seedlings but it does let you know if the thermostat is doing it's job.
And on the inset you can sorta see the polycarb sheet on the front of the lid and the shade screen Susan stapled on to keep me from turning the cabinet into a Sahara terrarium!
Growing Seedlings
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