This bed is using the methods outlined in Mel Bartholomew's Square Foot Gardening. A gird is placed on the bed cordonning it off into foot by foot squares which serves as a guideline for spacing. An example would be that one corn would fit in one square while sixteen beets can be in the same space. There are other aspects to the technique that we chose not to follow, such as the soil requirements. The author wants his readers to use a specially measured out soil mixture, but we simply used the soil that was preexisting in the bed.
The final bed is being used to test the idea of a polyculture bed, which I first read about on the blog Homegrown Evolution (http://www.homegrownevolution.com/2006/12/polyculture.html). Several different vegetable and herb seeds were broadcast (thrown evenly over the surface of the bed, not in rows). A thin layer of topsoil was placed over the seeds and was watered. The vegetables chosen all have differing maturation times and plant families so it serves to save space because multiple things can be grown in the same area without plants crowding out, and directly competing for nutrients.
In other news we have picked a date for the Earthworks Urban Farm fieldtrip: August 8th!! All those wanting to go... mark your calendars! Toodles.