I look forward to being bugged greatly! If Ibid swings in we'll have a party.
Now I'm gonna yammer on about farming mechanics.
okay so first thing's first, you need
ONE: preferably 3 fields, crop rotation is in
TWO: a compost box
THREE: a metric asston of autumn grass
okay here's how it works - the compost bin and the humus that it produces is important, very very important, you use it to prepare fields for planting, you CAN use it for a fertilizer but it's not the best (good if you're in a hurry though), and it effects the purity of your grown crops I THINK.
Compost bin runs off the purity of the boards and I think nails. Most people will get nails via buying them from an NPC stall at this point, so they may not factor in. Compost bins (probably) soft cap/hard cap purity. Humus purity runs off what you put in to make it into humus, and the earthworms you put in. Most any organic thing can be put in, right click on the bin to put in things for humus making, put in worms manually. Grass can be used for humus. A bunch of high purity grass (while hard to get), is very useful as a result!
Soil purity might factor in, I'm not sure, I think fields function as a building and as a result I dunno if it actually can pull from soil purity. Science will tell us with time.
SO. When you interact with a field you get a window with four bars. These are nutrient levels. Each crop takes some nutrients from one bar, and gives to another. As a result, if you plant the same crop over and over it'll take ages to grow. Like in real life. So. the wiki suggests to mark fields as a like, "primary" field for that crop. So everything you do in that field benefits the nutrient that the primary corp for that field needs. The wiki has more specific info, but that's the gist. As nutrient meters grow, crops turn into higher tier crops. So you start with colewart, move up to red/white cabbage, then up to green cabbage, for instance.
Fertilizers! A lot of things can be used sa fertilizers, and some of them are actually detrimental. The only one that is, I think, is clay.
Fertilizers effect four qualities, Upkeep (reduces the amount of seed and humus you need to replant the field), Plenty (How much you get out of the field, your level in stocks and cultivars also increases this amount innately), Speed (self explanatory) and Influence (increases the rate nutrient bars increase). Humus is a decent all around fertilizer, increasing plenty and influence by a bit, crown manure is an excellent all around fertilizer (but costs silver), Hay is the best influence fertilizer, Lime is the best plenty fertilizer, Wood chippings are the ONLY upkeep fertilizer as far as the wiki knows, and coal is the best speed fertilizer. Never use clay.
You now understand farming a little better hopefully.