<Li> Norfolk four - course crop rotation: Fodder crops, particularly turnips and clover, replaced leaving the land fallow . </Li> <Li> The Dutch improved the Chinese plough so that it could be pulled with fewer oxen or horses . </Li> <Li> Enclosure: the removal of common rights to establish exclusive ownership of land </Li> <Li> Development of a national market free of tariffs, tolls and customs barriers </Li>

What are the main food crops what techniques have improved crop yields during recent decades