Agriculture minister Audu Ogbeh flagged off the first consignment of the fibrous tuber from the port in the country's economic capital, Lagos.
"Oil and gas cannot employ millions of people just like agriculture so we must work hard to move from oil to earning foreign exchange from agriculture," he said yesterday.
Ogbeh told a news conference inspection charges on export produce would be reduced to encourage more overseas sales and greater competition.
"To make yam competitive, we will work on the packages and the right types of trucks to be used for transportation of the produce," he said.
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Yams, a staple grown across Nigeria, have gone up in price since last August when the country slipped into recession as a result of low global oil prices.
Nigeria relies on crude oil sales for 90 percent of foreign exchange earnings and 70 percent of government revenue.
"The (yam export) policy is going to compound our suffering," said Lagos housewife Bolanle Akintomo.
"A tuber of yam that used to sell for between 200 and 300 naira (63-95 US cents, 56-83 euro cents) is now 1,000 naira (USD 3.2, 2.8 euros).
"With exports, the price will further go up."
The National Association of Chamber of Commerce, Industry, Manufacturing and Agriculture said incentives were needed to produce enough yams for local and overseas consumption.
Denja Yaqub of Nigeria Labour Congress (NLC), said the initiative could encourage farmers to increase output, earning foreign exchange for the cash-strapped economy.
"The policy will also make our agricultural produce competitive in the international market," he added.
Yaqub said the government needed to reduce fuel costs for farmers, upgrade roads and improve storage facilities to cut waste in the supply chain and ultimately lower prices.
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