Posts Tagged ‘irrigation’

Keyhole Gardens

First made popular in Africa, keyhole gardens are catching on in Texas and other hot, dry places. Keyhole gardens hold moisture and nutrients due to an active compost pile placed in the center of a round bed. Although most helpful in hot and dry locations a keyhole garden will improve growing conditions in just about any climate.

From a bird’s eye view the garden is shaped as a keyhole. A notch is cut into a round garden bed, the notch makes for easy access to the center compost well.

The notch allows access to the heart of the garden

The notch allows access to the heart of the garden

Source of text and image: Inspiration Green Go there, read more, see more

I have never heard of this gardening technique before, what a wonderful idea if you have space.

Composting, irrigation and garden, all in one.

Global threat to food supply

…as water wells dry up, warns top environment expert

Lester Brown says grain harvests are already shrinking as US, India and China come close to ‘peak water’

Iraq is among the countries in the Middle East facing severe water shortages. Photograph: Ali al-Saadi/AFP

Wells are drying up and underwater tables falling so fast in the Middle East and parts of India, China and the US that food supplies are seriously threatened, one of the world’s leading resource analysts has warned.

In a major new essay Lester Brown, head of the Earth Policy Institute in Washington, claims that 18 countries, together containing half the world’s people, are now overpumping their underground water tables to the point – known as “peak water” – where they are not replenishing and where harvests are getting smaller each year.

The situation is most serious in the Middle East. According to Brown: “Among the countries whose water supply has peaked and begun to decline are Saudi Arabia, Syria, Iraq and Yemen. By 2016 Saudi Arabia projects it will be importing some 15m tonnes of wheat, rice, corn and barley to feed its population of 30 million people. It is the first country to publicly project how aquifer depletion will shrink its grain harvest.

“The world is seeing the collision between population growth and water supply at the regional level. For the first time in history, grain production is dropping in a geographic region with nothing in sight to arrest the decline. Because of the failure of governments in the region to mesh population and water policies, each day now brings 10,000 more people to feed and less irrigation water with which to feed them.”

Brown warns that Syria’s grain production peaked in 2002 and since then has dropped 30%; Iraq has dropped its grain production 33% since 2004; and production in Iran dropped 10% between 2007 and 2012 as its irrigation wells started to go dry.

“Iran is already in deep trouble. It is feeling the effects of shrinking water supplies from overpumping. Yemen is fast becoming a hydrological basket case. Grain production has fallen there by half over the last 35 years. By 2015 irrigated fields will be a rarity and the country will be importing virtually all of its grain.”

Running LowThere is also concern about falling water tables in China, India and the US, the world’s three largest food-producing countries. “In India, 175 million people are being fed with grain produced by overpumping, in China 130 million. In the United States the irrigated area is shrinking in leading farm states with rapid population growth, such as California and Texas, as aquifers are depleted and irrigation water is diverted to cities.”

Falling water tables are already adversely affecting harvest prospects in China, which rivals the US as the world’s largest grain producer, says Brown. “The water table under the North China Plain, an area that produces more than half of the country’s wheat and a third of its maize is falling fast. Overpumping has largely depleted the shallow aquifer, forcing well drillers to turn to the region’s deep aquifer, which is not replenishable.”

The situation in India may be even worse, given that well drillers are now using modified oil-drilling technology to reach water half a mile or more deep. “The harvest has been expanding rapidly in recent years, but only because of massive overpumping from the water table. The margin between food consumption and survival is precarious in India, whose population is growing by 18 million per year and where irrigation depends almost entirely on underground water. Farmers have drilled some 21m irrigation wells and are pumping vast amounts of underground water, and water tables are declining at an accelerating rate in Punjab, Haryana, Rajasthan, Gujarat and Tamil Nadu.”

In the US, farmers are overpumping in the Western Great Plains, including in several leading grain-producing states such as Texas, Oklahoma, Kansas and Nebraska. Irrigated agriculture has thrived in these states, but the water is drawn from the Ogallala aquifer, a huge underground water body that stretches from Nebraska southwards to the Texas Panhandle. “It is, unfortunately, a fossil aquifer, one that does not recharge. Once it is depleted, the wells go dry and farmers either go back to dryland farming or abandon farming altogether, depending on local conditions,” says Brown.

“In Texas, located on the shallow end of the aquifer, the irrigated area peaked in 1975 and has dropped 37% since then. In Oklahoma irrigation peaked in 1982 and has dropped by 25%. In Kansas the peak did not come until 2009, but during the three years since then it has dropped precipitously, falling nearly 30%. Nebraska saw its irrigated area peak in 2007. Since then its grain harvest has shrunk by 15%.”

Brown warned that many other countries may be on the verge of declining harvests. “With less water for irrigation, Mexico may be on the verge of a downturn in its grain harvest. Pakistan may also have reached peak water. If so, peak grain may not be far behind.”

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Opinion:

Just another example of, ‘we’re in the poo!

Oh, and the same thing is happening here in Brazil…

What happens when you steal from nature

The last two hundred years technology has gone ahead in leaps and bounds, but now some are paying the price.

An example, we have always considered water to be plentiful, but now we are finding it’s not.

I read a post yesterday, that shows how we waste when we have plenty, then cry when the plenty runs out.

Turning Kansas into a desert

“In west-central Kansas, up to a fifth of the irrigated farmland along a 100-mile swath of the aquifer has already gone dry. In many other places, there no longer is enough water to supply farmers’ peak needs during Kansas’ scorching summers. And when the groundwater runs out, it is gone for good. Refilling the aquifer would require hundreds, if not thousands, of years of rains.”Running ‘Cause I Can’t Fly

The farmers have used nature’s reserve water supply and now they have nothing. The water from the aquifers is not to be used, it is what keeps the planet healthy and once it’s gone, it’s gone, for good.

This is not only happening in Kansas, but in Colorado and Texas as well.

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