There are at least two ways in which farming in less economically developed countries (LEDCs) is different from farming in more economically developed countries (MEDCs). One of these ways has to do with the size and type of farms while the other has to do with the methods of production.
Farms in the less developed world are typically small. In general, the only large farms in such countries (if any) are plantations owned by multinational corporations. The native farmers typically farm very small plots. In addition, the farms in LEDCs are mainly subsistence farms. These are farmers who are generally growing things mainly for their own consumption. By contrast, in the MEDCs, farms are typically very large and only grow crops to be sold, not for the personal consumption of the farmers.
One reason for this is the methods of production. Farmers in LEDCs typically have access to very little machinery. They can only cultivate a small area because they lack the machinery that would be needed in order to farm large areas. By contrast, rich-world farms can be enormous because of all the machinery (such as tractors and combines) that can be used on those farms.