A world of wisdom there!

I raise hay and only hay.

I like to pull soil and plant samples the last year in alfalfa. Then the first year back in alfalfa I again sample, to quality check my fertility program.
Every year I plow out one alfalfa field, and every year I plant an alfalfa field. result is 2 samplings every year, just not the in the same field.

Every, end of stand, sampling includes molybdenum for an extra $18.
Then IF my fertilizer application included more than 650 lbs/A 0-0-60 and/or Moly the first of the stand will again include Molybdenum and/or chlorine request. The chlorine to make sure I did not put too much chlorine out with the potash, and the moly to check  there is enough but not too much Moly fertilizer.

On the sod grass hay meadows I sample every 3 years. With 7 fields that is 2 samplings three years running and one sampling the third year.

Plant analysis is very good using a series of ratios of elements. The Process is called DRIS. What this will do is, even though all elements are within the desired range, the Ca/K, Mg/K, M/K and a few others may indicate that the potassium level is a little suspect and consider applying some. The ratios have never lied but there have been times I did not listen.

I do advocate using tissue testing.
Consider yourself lucky you are not on a calcareous soil with a high clay content. Testing for free lime (high pH and too much Ca) was an additional $8. Testing for a measured CEC was an additional $40. The good thing is these values do not change with leaching or crop removal. When established it remains valid for the rest of your life time.