Are your conference pear and braeburn apple in the ground or in containers? In both cases they will need watering regularly to settle them in I personally would not feed them with anything but others may disagree. Your blackberry vine doesn't need feeding, it will grow quite enough as it is! Is your blueberry new this year and where is it planted and in what sort of soil/compost? In nature blueberries grow in coniferous woodland, they are ericaceous so need an acidic soil.

i agree with you moon grower. i have two new braeburn trees that i have just bought and i wont feed them at the moment.they need to settle in and get a good root system before they need feeding.the same with pears,i have two of those as well.

MG Pear and Apple new this year blueberry ad blackberries two yrs old and all are in containers.

I suggest you do a google search on growing brambles in containers as I doubt this is going to work. Make sure the blueberries are in semi shade and ericaceous compost. As for he two fruit trees just keep well watered - though I wonder how well a fruit tree is going to do in a container unless it is on a dwarf root stock.