Is your intention to try to preserve the clover/rye mix by planting brassicas into the existing and still-growing plot? Or are you going kill off or till under the rye/clover and then replant brassicas?
The problem is that .75 acre is a really small plot.
Brassicas need space and soil contact to grow and if you really want to maximize the size and nutrition value. I know guys interseed turnips or radish with clover/grain, but to really get the size and nutrition out of brassicas it needs enough space for each plant to develop.
I plant my brassicas blend at 9.5 pounds per acre. That seems to be about right in my relatively poor soil, that may be even too heavy in better soil.
So my concern is after getting used to your delicious rye/clover mix and probably keeping it mowed like a putting green, if your replant brassicas, the deer may eat all the greens in that small of a plot and really stunt the growth of the brassicas, preventing it from maturing.
Have you thought about just going with a blend of red and white clovers and then a nurse crop of rye or oats and then just leave it grow all year?
I think one thing that gets a little distorted is that guys think of clover as a “boring” crop that doesn’t have the glam of the money crops like soybeans, corn, or brassicas.
The reality is that the deer don’t share this view. There is never a time when deer WON’T eat clover. I have a plot that is 5+ acres split in half with 2+ acres of clover/oats and the rest is in summer planted brassicas. Even in November when the brassicas is prime and the deer are going crazy for it, they still go over and eat clover every day. My clover/grain plot looks like a golf fairway pretty much year round.
Deer will never ignore good clover and tender grain, no matter what else might be on offer. They may split their time between food sources, but they don’t roll back their use very much regardless. Clover is not second class food to deer.
Grouse