Right now it's extremely difficult to determine what the "crop speed fields" and "crop quality fields" are in your area (tree growth speeds are even more difficult to check). Currently it seems the only real way to figure out what crops grow fast in your area is with exact timers for when you planted crops; and then comparing that time to other area growth speeds. Quality limits for crops cannot even be checked until you hit the cap(s).
It was stated in the world 12 prelude that, "The caps are set high enough that they shouldn't matter at all for a good while." However this will eventually matter, and we currently have no way of testing this.
Can we please get a way to test the soil in our area and figure out what the crop speed fields are in our soil and at what qualities? Having to do months+ of testing is not exactly fun, engaging, or ideal gameplay.
In real life we are able to check the pH level of the soil, the main macronutrient (Nitrogen (N), Phosphorus (P), and Potassium (K)) levels in soil, and the micronutrients in the soil. These figures (combined with climate) can be a good indicator of soil health and what kinds of crops can actually be grown there.
I'm not saying we should have to do such in depth testing like we have to in real life, but it would be really awesome and appreciated to be able to check our soil quality in any way. Extra bonus if we get a method to check tree growth speeds as well.