You get almost no skill for sowing. You get most skill from farming and maybe a good deal less than that for harvesting.
Your best bet is to assume that you will not be making any real crop gain from your farming until your skill is at 15. In other words, up to that point all your farming will be very much sowing one seed to get one seed back. With a 50-tile farm you will get roughly 1 point of farming per day if you tend your fields twice a day at 10 hour intervals. Takes about 20 mins to tend 50 tiles with a 10 [[QL]] [[rake]]. As your skill level improves yield increases from 1 2 through 3 and 4 to 6and up to 10.
'''Tip:''': If possible always sow, farm, and harvest at the same time just before you go to sleep. That way, if you can check again first thing after you wake up, you should almost never lose any crop.