A bit part of the grow bag trials we did this year was seeing how different types of amendments to the topsoil can benefit the growth and yield of potato plants. The difference between these methods was really significant, and a good visual demonstration of how well and poorly the same potato plants can grow in side by side trials.
0:00 soil amendment trials
1:00 soil only
2:47 concentrated fertility
4:53 municipal compost
6:32 compost + additional feeding
9:04 compost tea or biochar
10:50 soil under compost piles
12:45 changing trial for next year
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Part of the Cloughjordan Ecovillage, Tipperary, Ireland http://www.thevillage.ie