BIO220H1 : Lecture 21 Notes

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BIO220H1 Full Course Notes
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BIO220H1 Full Course Notes
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Change structures involving population growth or agriculture: both were addressed. People just started to realize the population boom. Dry land agriculture depends just on precipitation for water. Longest ecological experiment started by john bennett. The nutrients can be replaced by natural processes but if you harvest intensively repeatedly, the nutrients aren"t replaced fast enough and soils are exhausted. Draft animals produce a lot of fecal waste (dung = fibrous organic matter + John bennett was interested in the chemistry; he found that he got dramatic effects when he used nitrogen. Saltpeter --> two compounds called this; kno3, nano3 (both very good agricultural fertilizers) Before more technology came around, saltpeter was only available from various mineral deposits in the world (one of the driest places in the world. -> atacama desert); there are salt plains that have lots of nitrates. Countries went to war for this saltpeter; high economic value; this was before the haber-bosch process.

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