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About the OP post.
Until the advent of mechanization 90% of the population was working in agriculture to raise enough food for the population. Beside plant growth I don't see anything that directly impact cultivation. Create water can help a bit, but the quantity produce isn't so great (as someone pointed out in another thread a single 1st level caster will produce less water than a wind powered pump. Sure, you can produce it even in a area where there isn't a water table accessible for the pump, but you need a large number of casters to produce the water needed for a single village.
an animated plow that do the same work of a team of ox will cost 2.000 gp (small animated object).
Actually it will do less than the oxes. With the oxes you can use them to pull a wagon after you have finished plowing, the animated plow will do only a single work.
Maybe you could commission a large animated object in the form of a cart to do all the work of a farm tractor. 12.500 gp. My rough estimate is 1 gp = 25 €. That is 312.500 €. Very few people can afford that. And to build the construct you need a 5th level wizard (Craft wondrous item at level 3, craft weapon and armor at level 5, 5th level bonus feat for craft construct).
Then there is the problem that you raise your character level very slowly or the hard way, earning XP. So to get a 5th level wizard without adventuring we need to have him train for a lot of years. Probably he would be a 40+ years old guy in a age where most people will die of disease before becoming so old.