Quince Vranja

I planted a quince tree in 2014 but this year the leaves seem to be mostly yellow rather than green. Any idea what I can do?
I placed a willow paling three feet from the tree to prevent the wind blowing off the blossom but it does not block all the sunlight. The ground is rather waterlogged as when I take my rotary drier spike out, the water level is high in the ground tube.
thanks

Marianne
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If you live in Derbyshire, as I do.
Ah, ok. I'll have to put some sand down, or move it.
thanks for the advice - much appreciated!
Marianne