There are two main reasons for the fact that farming in more economically developed countries (MEDCs) is easier than in less economically developed countries (LEDCs). One of these has to do with technology and the other has to do with infrastructure.
One thing that makes farming easier in the developed world is the extent of the infrastructures of these countries. There are universities that do research on how best to farm. There are extensive road and rail systems to take farmers’ crops to market. There are massive irrigation programs that bring water to places that would not otherwise be very good for farming. All of this is much more available in the MEDCs than in the LEDCs.
The other factor is technology. Two very important technological advantages that MEDC farmers have are machinery and chemicals. In the rich world, farmers can use all sorts of machinery to make every step from planting to harvest much easier. In addition, they have easy access to fertilizers and pesticides that greatly increase their ability to get high yields from their lands.
For these reasons, farming in MEDCs is much easier than in LEDCs.