The first Agricultural revolution was Neolithic Revolution. It occurred in 10,000 B.C. It was a change in how people lived. It was important to humans because it was the wide-scale transition for humans. Humans went from a lifestyle of hunting and gathering to agriculture and settlement. The settling increased population largely. Humans began to domesticate animals and cultivate crops.
This is one of the domesticated wild grasses that they used which is known as wheat.
The second Agricultural revolution occurred from the 1700's to the 1900's. There was actually two revolutions going on in that age period, industrialization. The changes that happened during the second Agricultural revolution. They were now using plows, the horse collar and the seed drill. It began in Britain in the late 1700's. This was usually done in people's homes using their hands or basic machines. Fields were now doubled or tripled in size but still the same amount of labor. This increased in productivity and allowed population to increase on both a local and a global scale. Many less developed countries are still in the Second Agricultural Revolution.
This is what a horse plow looked like and they still use them today.
The third Agriculture revolution is the Green Revolution. The Green Revolution allowed scientists to create higher functioning farming methods that are adapted to environmental conditions in specific regions. The Green Revolution was largely responsible for preventing a food crisis in these regions (Asia and Latin America) during the 1970s and 1980s.
Farming now people use plows and other mechanics that is better for the environment.
Genetically modified organisms are plants and animals that have changed as a result of biotechnology. It changed farming because some advantages are more resistant to weeds, pests and diseases. And there is higher nutritional value. Some of the disadvantages of them are that it's more expensive, were marketed without labeling. This changes farming because they are physically changing things in crops and animals which may be good but also bad because it is changing everything about it.