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.
This gives you approximately 440 trees per acre. Maintain this spacing until the trees reach 8 in diameter, then thin to increase spacing to 20'. At 20 diameter, crop trees (either planted or in the woods) should have 35' of space between them, leaving about 36 per acre, plus under-growth shrubs and saplings. When trees reach 30 diameter, increase the distance to 50', leaving 16-20 per acre until harvest.