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Organic Fertilizers In The 1800s

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For thousands of years after humans shifted from a hunter gatherer society to an agricultural society, manure was the main source of fertilizer. It was organic and readily available. Somewhere along the line, farmers learned that ground-up bones provided crop nutrients. Major powers at that time, like England, began importing bones from everywhere. Eventually these organic fertilizers would no longer suffice. In the early 1800’s Thomas Malthus,an economist and writer, said that the world’s population would grow faster than the food supply. Luckily, this was around the same time the Agricultural and Industrial Revolutions began. Agriculture science started being researched more.
It wasn't until the 19th century that ground-breaking research,

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