Regarding the increase in yield of a certain crop, it's a very interesting topic.
Take potatoes as an example. Before being brought by colonizers from the New Continent to the Old World, the yield per mu of potatoes in the hands of indigenous people of the New Continent was about 80-100 jin, which is not a particularly high number.
However, in the Old World, due to the development of agricultural technology and the advances in biology, through methods such as breeding good varieties and scientific planting, the yield per mu of potatoes increased rapidly.
Take wheat as another example. From the twelfth century to the eighteenth century in the original world, the yield of wheat had little increase over hundreds of years.
But between 1770 and 1810, in just a few decades, the yield per mu of European wheat doubled.
