[mdjlucan]

My grapes been in about three years now can you tell me why  some of the leaves going yellow they done this last year

[mumofstig]

Has it got any signs of insects that need sorting out?
Did you feed them over the winter? or are the roots simply too dry?

If it's not an insect problem, I'd get a fertilizer with trace elements (Vitax Q4 for example) and give it a feed plus a good watering, hopefully that will stop more leaves being lost.

[mdjlucan]

About a week ago I gave tham a really good watering I did not give them any feed over winter but last week I gave them fish bone and blood fertiliser would that be okay

[mumofstig]

Ok wait a week or so and see if any more leaves go yellow - if they do, then you need the trace elements for mineral deficiency.
Carry on watering every week or so, if we don't get much rain.

[mdjlucan]

What do you mean trace elements for  Deficiency I think I said this right

[mumofstig]

mumofstig:a fertilizer with trace elements (Vitax Q4 for example)

The three main nutrients in ordinary fertilizers are nitrogen (N), phosphorus (P) and potassium (K). Shown as NPK on the labels. It's what you give the plants with Fish, Blood and Bone.
Plants also need small quantities of iron, manganese, zinc, copper, boron and molybdenum, known as trace elements because only traces are needed by the plant. Sometimes the soil has low levels of these and it causes problems with the leaves - sometimes they turn yellow, or get a purplish tinge - depending on which nutrient is in short supply.
John's info about them is here https://www.allotment-garden.org/composts-fertilisers/trace-elements-in-plant-nutrition/

[mdjlucan]

Sorry to be a pain but if Gave them  fish bone and blood fertiliser will it be okay to give him this NPK

[Yorkie]

No need at the moment, wait a short while as mumofstig said, because fish blood and bone is a slow-release fertiliser so takes a little while to start acting.  And if you need to add something else to provide the trace elements then it won't be a problem.

[mumofstig]

Sorry to be a pain but if Gave them  fish bone and blood fertiliser will it be okay to give him this NPK

NPK is what you've already given them, that's what is in fish blood and bone, what you haven't given them is the trace elements.
BUT, as Yorkie says, wait a while and see if what you've already given it does the trick, before worrying about anything else for now, apart from water if the weather stays dry
It won't hurt the plant to lose those a few leaves....

[mdjlucan]

Thank you for all your information I will just keep my eye on them