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TEST 7 – An Ordinary Miracle
Bigger harvests, without pesticides or genetically modified Crops?
Farmers can make it happen by letting weeds do the work.
Across East Africa, thousands of farmers are planting weeds in their maize fields. Bizarre as it
sounds, their technique is actually raising yields by giving the insect pests something else to chew on besides
maize. "It’s better than pesticides, and a lot cheaper,"
said Ziadin Khan, whose idea it is, as he showed me
round his demonstration plots at the Mbita Point research station on the shores of Lake Victoria in Kenya.
"And it has raised farm yields round here by 60 to 70 per cent.”
His novel way of fighting pests is one of a host of low-tech innovations boosting production by 100
per cent or more on millions of poor Third World farms in the past decade. This “sustainable agriculture"
just happens to be the biggest movement in Third World farming today dwarfing the tentative forays into
genetic manipulation.
In East Africa, maize fields face two major pests, and Khan has a solution to both. The first is an
insect called the stem borer, whose larvae eat their way through a third of the region s maize most years. But
Khan discovered that the borer is even fonder of a local weed, napier grass. By planting napier grass in their
fields, farmers can lure the stem borer away from the maize and into a honey trap. For the grass produces a
sticky substance that traps and kills stem borer larvae.
The second pest is Striga, a parasitic plant that wrecks
$10 billion worth of maize crops every year, threatening the livelihoods of 100 million Africans. "Weeding
Striga is one of the most time-consuming activities for millions of African women farmers," says Khan. But
he has an antidote: another weed called Desmodium. "lt seems to release another sort of chemical that Striga
doesn’t like. At any rate, where farmers plant Desmodium between rows of maize, Striga won’t grow.”
"The success of sustainable agriculture is dispelling the myth that modern techno-farming is the most
productive method," says Miguel Altieri of the University of California, Berkeley. "In Mexico, it takes 1.73
hectares of land planted with maize to produce as much food as one hectare planted with a mixture of maize,
squash and beans. The difference," he says, "comes from the reduction of losses due to weeds,
insects and
diseases and a more efficient use of the available resources of water, light and nutrients. Monocultures breed
pests and waste resources,” he says.
Researchers from the Association Tefy Saina, a Madagascan group working for local farmers, were
looking for ways to boost rice yields on small farms. They decided to make the best use of existing strains
rather than track down a new breed of super-rice. Through trial and error, a new system was developed that
raises typical rice yields from three to twelve tonnes per hectare. The trick is to transplant seedlings earlier
and in smaller numbers so that more survive; to keep paddles unflooded for much of the growing period; and
to help the plants grow using compost rather than chemical fertilisers. The
idea has grown like wildfire, and
20,000 have adopted the idea in Madagascar alone.
Few countries have switched wholesale to sustainable agriculture. But Cuba has. The collapse of the
Soviet Union in 1990 cut off cheap supplies of grain, tractors and agrochemicals. Pesticide use halved
overnight, as did the calorie intake of its citizens. The cash-strapped country was forced to embrace Low-
input farming or starve. "Today," says Fernando Funes of the Country’s Pasture and Fodder Research
institute, "teams of oxen replace the tractors, and farmers have adopted organic methods, mixing maize with
beans and cassava and doubling yields in the process, helping average calorie intake per person rise back to
pre-1990 levels.”
Worldwide, one of the most widely adopted sustainable techniques has been to throw away the
plough, the ultimate symbol of the farmer. Ploughing aerates the soil, helping rot weeds and crop residues.
But it can also damage soil fertility and increase erosion. Now millions of Latin
American farmers have
decided it isn’t worth the effort. A third of Argentina’s farms no longer use the plough. instead, they fight
weeds by planting winter crops, such as black oats, or by spraying a biodegradable herbicide such as
glyphosate. The farmers saw results in a short time - reduced costs, richer soils, bigger grain yields and