i'd have to ask what you meant by shrimp compost? if it is just the shells/heads from your eating shrimp, if you can bury it deep enough to keep critters out, then yes, we used to do that at home when i was a kid, living on the bayou. not with roses, but with fruit trees. but, if you are talking about a commercial product, i really don't know rose specific, although most compost would be good for most plants.
the 1st # is your nitrogen.I think the shrimp waste would be close to the same as fish emolsion.Fish kelp is actually better,cause it has more trace minerals& is useually cold compressed/cured(what have you) I've added shrimp by product& crawfish byproduct to compost pile...along with bass /crappie/blue gill.I even recently sifted not one but TWO stringers from compost pile.....(neither was mine....but I KNEW who owned the green stringer)and a golf ball(go figure)
I will age ungracefully until I become an old woman in a small garden..doing whatever the Hell I want!
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