The small farm covered barely a hectare when it was set up in Porto Novo in 1985 but has since become a pilot project for the rest of the continent badly in need of new ideas to maximise yields.
The centre, in Benin's capital now stretches over 24Ha and employs an army of workers and apprentices, who toil from sunrise to sunset growing fruit, vegetables and rice, as well as rearing fish, pigs, poultry.
“Nothing is wasted, everything is transformed" according to Nzamujo's principle, with even chicken droppings turned into the bio-gas that powers the centre's kitchens.
Songhai in tiny Benin has big plans for Africa. It already has similar operations in Nigeria, Liberia and Sierra Leone and wants to set up shop in 13 more west and central African countries.
Nzamujo's main aim is to help Africans increase yields through simple techniques, without using pesticides or fertilisers, and while cutting production costs and protecting the environment.
The Nigeria-born priest, who was raised in California on the US west coast, said he was shocked by the appalling images of famine in Africa on television at the start of the 1980s.
He then left to discover the continent to see how he could put to good use his university training in agronomics, economics and information technology and fight against poverty on his own terms.
After visiting a number of countries, he ended up in Benin where the country's then-Marxist government gave him a small plot.
"It was abandoned land, killed by chemical fertiliser and conventional agricultural practices. It didn't work". he told AFP.
"There were seven of us. We dug wells and watered with our own hands. And during the main dry season, this grey surface became green", he recalled with a smile.
Nzamujo's secret is in imitating nature, encouraging "good bacteria" present in the soil to maximise production without having to rely on chemicals.
Yields at Songhai speak for themselves: the farm produces seven tons of rice per hectare three times a year, up from one ton per hectare once a year at the beginning of the project.
"Songhai is facing up to the triple challenge of Africa today: poverty, environment and youth employment", said Nzamujo proudly.
The cleric's system centres on local production and distribution, creating economic activity to tackle poverty head on.
At Songhai, jam simmers in large pots while chickens are roasted and soya oil, rice and fruit juice are packaged for sale in the centre's shop or served at its restaurant.
Discarded parts of agricultural machinery are reused to create ingenious contraptions and used water is filtered using water hyacinths.
The centre also has an internet point and even a bank so that local people can avoid going into the city centre.
Youth employment is encouraged and some 400 farm apprentices, selected by competition and are trained every year. The 18-month course is entirely free.
Paul Okou is one of them. The 25-year-old from Parakou, northern Benin, would like to follow his parents into farming but is hoping to work in a more profitable way.
"My parents use traditional, archaic methods while at Songhai we learn the modern way, albeit makeshift", he said.
"What we used to do in two days now we do in two hours."
The apprentices are sent into villages where they apply what they have learned. Once in charge of a farm, they join the Songhai network and are checked regularly.
Songhai also welcomes interns who are paying for their own training.
They include Abua Eucharia Nchinor, a Nigerian in his 30s, and Kemajou Nathanael, a 39-year-old former salesman from Cameroon, who both want to open an organic farm in their respective countries.
According to Nzamujo, Songhai is not a cure-all for Africa's problems but tackles their root causes.
"Imagine if all the young people who hang around big cities did their training here and we equip them. Imagine the productivity of Africa today", he said.