Building Soil
https://research.fs.usda.gov/download/treesearch/80509.pdf
Visit this website for fascinating information on how healthy soil fungi can restore the balance of micro-organisms in the soil.
This video teaches soil building techniques that we use in our teaching garden: chop and drop, innoculate gardens with forest soil, three sisters companion planting, compost tea, cover cropping, and seed saving.
This wonderful video teaches us about the ten best cover crops to feed the soil and make soil soft rich and fluffy.
This video teaches how northern people can extend the growing season--with lessons from medieval farmers.
Building Soil
Here is an important video about the importance of mycorrhyzal fungi on soil and plant health: