ZIMBABWE may have to import 400000 tons of maize this year to offset a deficit in national consumption requirements following predictions that farmers will produce slightly above 1,5-million tons. Economists say the current instability in the foreign exchange market has now touched on the maize import bill, which has seen millers pressing for more adjustments in the price of maize-meal. Heavy and incessant rains, which pounded most parts of the country last season, are also reported to have seriously affected the national maize output.