Kremlin leader Mikhail Gorbachev called for wide-ranging agricultural reforms during a meeting of Communist Party chiefs on Monday devoted to the country's chronic food shortages. Moscow radio said Gorbachev told the conference in Oryol, 225 miles south of Moscow, that an improvement in food supplies was the Soviet Union's most important domestic task. "Gorbachev stressed the need to go over to new methods of economic management in the countryside including the lease and family contracts," the radio said. The Kremlin has recently allowed peasants to lease land for periods of up to 50 years in an attempt to boost agricultural production. Although Gorbachev frequently goes on trips outside of Moscow to push his reform effort, it was rare for him to call a large gathering of top national and regional officials outside of the Kremlin.