Historians used to believe that the Agricultural Revolution took place at the same time as the Industrial Revolution.  They believed new inventions, developments in farming meant far more was produced from the land.

As the population grew in the 18th and 19th Centuries, so did agricultural production.  By 1850 it is estimated that around 6.5 million extra mouths were being fed from home production than in 1750.

More recently, historians have questioned whether this Agricultural Revolution took place at exactly the same time as the Industrial Revolution - did they take place simultaneously?

Many now see the Agricultural Revolution as a 'revolution' that took place in three steps or phases:

First Phase (completed by 1750-1770) Introduction of new crops and a rise in the efficiency of workers.  This meant more could be produced, and thus the agricultural economy could grow. Second Phase (from 1760-1830) Land was reorganised (enclosure) and larger farms developed.  Different areas of Britain began growing specific crops - know as regional specialization. Third Phase [Second Agricultural Revolution] (began around 1830) Farmers began using new fertilizers for land and artificial feedstuffs for animals.  Combined with improved drainage this meant the agricultural economy was very strong between 1840-70).

After 1870 there was a severe and long lasting agricultural depression.  During the Agricultural Revolution there were no real technological advances.  This was unlike the Industrial Revolution where steam powered machines were vital.  

During the agricultural depression of the late 1800s, many agricultural workers moved to the cities.  It was only then that farmers began to introduce machinery.