GADAU, NIGERIA - Nigerian Abdulhakim Mohammed has just graduated in architecture but, like many people ranging from unemployed locals to foreign investors and Africa's richest man, he has decided the future lies in rice farming.

The reason is that domestic rice prices have more than doubled in the last two years due to an import ban and a dive in the Nigerian currency. At the same time, the government is subsidizing tractors, mills and fertilizers as well as arranging cheaper loans to boost production - with considerable success.

Nigeria's Rice Boom Raises Output but Old Problems Persist

And yet the drive to cut an annual food import bill of $20 billion has run into the kind of problems that have long bedeviled Nigeria's efforts to build up an economy outside its dominant the oil industry.

Nigeria's Rice Boom Raises Output but Old Problems Persist

Despite rice growing being a government priority, many farmers still work with their bare hands in fields lacking irrigation channels. Mills are often ramshackle while poor roads make getting the crop from the main growing areas in northern Nigeria to consumers in the south difficult and costly.

Nigeria's Rice Boom Raises Output but Old Problems Persist

As a result, the industry has so far failed to fill a supply shortfall amounting to about 3 million tonnes of milled rice created by the import ban. In the commercial capital of Lagos, supermarkets mainly sell rice from India or Thailand.

Mohammed took up growing rice three years ago to help fund his university studies in the northern state of Bauchi. When he finished last year, he opted for a career in the fields around the town of Gadau, rather than in architecture.

"My advice to the youth is to join rice farming," said Mohammed, who is expanding his own area from 1.5 to 2 hectares (3.7 to 5 acres) as well as working as a supervisor on a new farm that workers are preparing nearby.

"One bag of rice sells for 10,000 to 11,000 (naira). Two years ago I was selling for 4,500," he told Reuters.

That makes a bag worth almost $25 at the exchange rate on the black market, where many Nigerians go due to restrictions and dollar shortages in the official banking system. In Bauchi state, hundreds of farmers are busy expanding, preparing new fields and drilling water holes for irrigation.

Farms have been opening across much of the country, lifting output of unmilled rice to 7.85 million tons in 2016 - a 17.4 percent jump from 2014, the National Bureau of Statistics told Reuters. That compares with just 4.54 million in 2010, before the campaign began.

Until 2015, Nigeria imported up to 4 million tons of rice annually, much of which was smuggled from the western neighbor Benin Republic. But this has fallen to about 700,000 tons as authorities now monitor the border, industry players say.

That lifted prices for the staple, along with currency curbs imposed to prop up the naira which has been hit by a fall in revenues from Nigeria's oil exports.

Part of the rise is because farmers are passing on higher costs, saying the government subsidies are not enough. Importers have to pay a premium of 30 percent over the official rate to get dollars on the black market for buying the foreign-made machinery and fertilizers that growers need.

On top of this, farmers complain that endemic corruption means the government help doesn't always reach the right people.

"Some people who got fertilizers were not even farmers. They sell it then," said Mohammed Tafida, the local head of a rice farmers' association, who is also expanding his own fields.

"Fertilizers are very expensive," he told Reuters, standing by a new paddy field being prepared. "Our production costs are very high. You now pay workers 500 to 700 naira a day; before it was 200 naira."

President Muhammadu Buhari has made fighting graft a priority since coming to power two years ago. But he has to work with Nigeria's 36 states where officials executing the federal programs often help out supporters or relatives.

Farmers and food producers can get subsidized loans well below the benchmark interest rate of 14 percent. But one processor of garri - another local staple, made from cassava - said he had waited six months to get his loan approved as banks are new to the farming business.

"In Nigeria talking is one thing and implementing plans another," said Idris Salihu, another rice farmer in Bauchi. "We need more support."

The rice boom has also drawn large scale investment from Africa's richest man, Nigerian Aliko Dangote, and foreign firms to supply the huge market of 190 million people.

Dangote Group said last month it planned to launch a rice mill with a farm scheme which will produce 225,000 tons of parboiled, milled rice by the year-end.