What are common grid sample sizes in acres?

Every field is completely uniform in it’s lime requirements.

Formulas are used to calculate lime requirements to bring soils to target levels.  The major variables used in these calculations is target pH for the crop, buffer pH (BpH) which is derived from a soil test, and the neutralizing index (which is unique to the liming material.)   Buffer pH indicates which of the following?  

What color does the Phosphorus deficiency routinely appear as in deficient crops?

How much 9-23-30 would you apply per acre if you wanted 27 units of N per acre for a starter on your corn crop?

When taking a soil sample, often it is 7-9″ in depth, as it is the approximate zone of root activity.

Which areas should you avoid sampling when you are probing soil samples?

If you are sampling 11″ corn plant for nutrient deficiencies, you collect what part of the plant?

Most horticultural crops perform best when soil is in what range?

When should you take soil samples? (multiple answers)