I don't get how this could work. They did not pack the wicking chambers. Also, they did not pre-moisten the potting mix. How long would it take for the mix to saturate and reach the plants? Would the fertilizer still work efficiently just laying on the surface like that?
There are a lot of crappy videos on YouTube, made by people who really don't know what they're doing. Even some of the older videos made by the Earthbox inventor have departed from our basic instructions. The best/most accurate videos are posted here, on the Earthbox web site: http://www.earthbox.com/videos.asp
After many members reported what worked for them, things have been narrowed down to a couple of important rules/steps:
1- The mix must be moistened or wet before starting.
2- pack the wicking corners all the way up as mix is added
3- the dolomite should be mixed into the potting media (in the upper half of the box, or throughout... your choice), NOT just sprinkled in a layer.
4- If organic fertilizer is applied in a strip, it must be covered by at least 4" of mix. It can be mixed throughout, your choice. Synthetic fertilizers must be applied in a strip covered by 2" of mix
5- Never water from the top unless there is an emergency requiring it.
6- Always keep the shower cap on
7- Follow the Earthbox instructions and planting guide at least the first season before experimenting or bending the rules. Understand the process. http://www.earthbox.com/instructions.asp http://www.earthbox.com/what-to-grow.asp