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Citrus questions

Sean O'Hara mentioned a "balanced citrus fertilizer". Here in England we
can't get such a thing. (For my single Meyer's lemon here I make do
alternating tomato fertilizer with a seaweed-based general fertilizer.)

Question 1: What is the ideal NPK ratio for citrus? Any particular trace
element requirements that are different from eg those of tomatoes?

Question 2: We're just starting a small garden in coastal southern Greece
and once we've got irrigation going plan a very few open-ground citrus.
Lemons grow easily in that part of Greece and shouldn't be a problem, but
locals say oranges are more difficult on our steep terraces (ex olive grove
on rocky hillside, soil pretty thin), though people do grow them well on
the richer deeper bottom ground. Is it a lost cause to try oranges on our
dry hillside? Any recommendations of varieties for dry hungry ground? Any
mileage in grafting oranges on more thrifty lemon understocks? Any hope
whatsoever for limes? (It's warm enough, but maybe the atmosphere's too dry
in summer - three or four virtually rainless months, with relative humidity
averaging 45 to 50% then.)

Alisdair Aird (Sussex, England)
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