What's a common factor that decided where humans would settle into agriculture?

Farmers and their families are members of the society in which they live. In any society there are strong pressures on its members to behave in certain ways. For the farmers, some of these pressures will come from within. In all societies there are accepted ways of doing things and these ways are directly related to the culture of the society. Farmers' attitudes and desires are influenced by their society's culture. If it is customary in a certain community for farmers to scatter seed and plough it into the soil, people will grow up to believe that that is the only correct way of planting. Even if the benefits of other methods are explained to them, their strongly held attitudes may make it difficult for to them change.