A Geography professor explains the evolution of the use of fertilizer starting around 1600.
There are many other Geography skill/concept videos at "MAGE Geography". MAGE is a non profit organization which produces free materials for Minnesota students and teachers of Geography. Check out the database of MAGE podcasts at:
lt.umn.edu/mage...
Негізгі бет MAGE Podcasts: A Short History of Agricultural Fertilizer
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