Choosing the right implements question

Folks I'll post this on the implement page as we but thought and hit up Ford tractor page as well. I've read a few non-direct comments on tractor implements he based on multiple factors to include the horse power of tractor. My question is that horsepower based on the overall engine HP or the drawbar HP as there seems to be a different of opinion on this?
 
My opinion is that A dynamometer can easily read PTO HP and can be accomplished in a manufacturer's test bay whereas drawbar HP depends
upon lots of variables and tractor to soil contact...much more cumbersome, too many variables and expense.

The difference in usable HP numbers between the Dyno and field test depends on the tractor's drive line and tire to ground contact
efficiencies, so guessing the latter is just a crap shoot unless you do it where you want to pull, at the time you want to pull, with the weather
and soil conditions when you want to pull, with the implement you want to pull, adjusted correctly for the best performance.............get the
drift?
 
The reason for the question was driven by as I was looking at disc harrows online and some sites listed implements recommended for tractors within a certain HP ranged (25hp-35hp, 30hp-45hp, etc) and was wondering which HP they were referencing? Totally get picking right implement is based on numerous factors (task, soil, weather, speed, etc) but assume the power of the tractor does play a big part on choosing the size of the implement to optimize the job.
 

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