Making differently balanced garden compost

So ,might I just throw more of the soft vegetal remains to one part of the compost heap and the harder ,rootier stuff on the other side?

Then use the latter stuff for particular requirements....

I thought manure was supposed to be mainly nitrogen rich.

I have plenty of stable manure and I do add it to my garden based compost but I think that I need a richer source of phosphorus ,for example at the time my strawberry plants are fruiting.

I also have trouble getting sturdy pea plants and wonder if extra nutrients in the soil would help this (I get quite a few mange touts off them but the plants seem to weaken quite soon-I appreciate that planting them in succession would resolve this problem to a degree)

Other than that my compost+stable manure can be absolutely brilliant and my swiss chard were like small bushes this year-great fennel too.