I am doing my best to follow the instructions when it comes to
feeding, erring on the side of less if at all. However, plants
sometimes need some kind of correction, and I am looking for your
help.

Both symptoms are to do with roses in containers. One of them (unknown
hybrid tea) has developed this year the tendency to droop its flowers,
unlike last year. Does that mean too much nitrogen? Too little
potassium? Or perhaps not enough sun?

The other (pink flower carpet) shows yellowing of leaves, mainly from
the centre of the bush (possibly these are older ones, I don't think
it shed them all), delay and unwillingness to flower and some blind
shoots (withered ends). General malnutrition? I fed it with granular
rose fertiliser when I pruned it and (at a later stage) with chicken
manure pellets.

Thanks in advance for any opinions,

Kostas