barile -

It sounds like the fertility level of the soil is high, 4-6 ft is very tall. I assume most of the height was Cereal Grain, (rye, probably) maybe some grasses in the mix - and possibly some annual weeds as well. I' d guess the clover was less than 24" at mowing. While poast might be the answer in the end for you, keep in mind that its likely the mix purposely had some grasses (for turkey chick survival- and food). Applying poast will eliminate that part of the mix - which is fine if you want a clover plot aone.

Personally I' d wait 2-3 weeks after mowing to see of the clover comes back stronger than the other plants in the mix. Clover can smother other competing grasses/weeds if the conditions are right.

Dan' s point about the clippings smothering the plot is a good one. Clover is usually quick to shoot up through a mulch, you need to keep a close eye on it to make sure its not too thick.

good luck.