I have a number of fruit bushes (gooseberry, redcurrant, blackcurrant, blueberry and autumn fruiting raspberry) in a large fruit cage. The floor is covered with a liner right up to the plant stems and then covered with a good thickness of wood chip. I have been reading that I should apply some type of feed in spring such as blood, fish and bone but I am not sure how to apply a feed in view of accessing the surrounding plants stems under the liner and wood chip. Also, I have a number of quail occupying the cage so obviously whatever I apply would have to be considerate to their health. Any advice, thank you.