• artificial blocks (like air, water, lava, fire) won't be accepted as dependent/conditional blocks (I've tried to use the for the element-seeds for "Primoral Crops")
• if I put, as a condition, that the crop has to look, in a 3x3 grid under the farmblock, for 9 blocks of, for example, gold-ore, to accept a seed, then all that is realy needed is 1 block in the 3x3 grid, and the seed will be accepted
• Some blocks, such as skulls, will be accepted as dependent/conditional blocks for the recipe, but, when placed under the farmblock, they are not recognized by the seed.

I can offer something for that second point. I haven't checked out the other two yet.

So I found a typo in the plant and requirement loading code that was causing all the BlockConditions to be created with the amount set to 1. I fixed it two different ways, but I'm preferring PR #3 on AgriCore.

To test that out I changed the JSON for a Diamahlia plant like this:

    "conditions": [
      {
        "amount": 3,
        "min_x": -1,
        "min_y": -2,
        "min_z": -1,
        "max_x": 1,
        "max_y": -1,
        "max_z": 1,
        "item": "minecraft:diamond_ore",
        "meta": 0,
        "tags": "",
        "ignoreMeta": true,
        "ignoreTags": [],
        "useOreDict": true
      }
    ]

And then I verified various combinations: pictures!