BUENOS AIRES, April 10 (Reuters) - Argentina has patched up its wobbly economy with a so-called "soy dollar" preferential exchange rate to boost grains exports and bring in much-needed foreign currency, which analysts said would give the government breathing room, at least temporarily. "The 'farm dollar' will not create extra foreign currency, but at least will accelerate it coming in and so provide temporary relief," said economist Gustavo Ber, adding that foreign currency reserves had hit "critical levels." Reuters Graphics Reuters GraphicsThe so-called "soy dollar" was used twice last year and did help create a boost in exports, at least in the short-term helping ease availability of foreign currency. "This new measure aims to buy two months, which in the current context is not insignificant," Geretto told Reuters. Reporting by Walter Bianchi and Anna-Catherine Brigida; Editing by Adam Jourdan and Aurora EllisOur Standards: The Thomson Reuters Trust Principles.

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