Medicine is not for everyone. Choosing to pursue a career in medicine for prestige or financial rewards will likely be disappointing, as most physicians find that medicine is a vocation that requires a commitment to service, lifelong learning and the dedication to practice competently and compassionately.
Though in many European orchards the number of trees per acre is set at 5,000 trees or more, in the US the apple tree density starts at 450-485 trees per acre with a maximum of 1,100 trees/acre. This is a recommended number for the dwarf apple trees.
The number of ears per plant varies as a function of genotype and plant density and other factors as you know. There is and old hybrid, WF9*C103, that even at 5000 plants per acre only shoots one ear, but its optimum plant density is 10 -13 thousand plants/acre.