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Recept: pompoensoep

Prei

Ingrediënten (voor 4 personen)

- 1 middelgrote oranje pompoen
- 1 ui
- 1 prei, wit en groen gescheiden
- 2 kleine of 1 grote wortel
- 1 courgette
- 2 tenen knoflook
- 1 (moes)appel
- 1 liter water
- 2 bouillonblokjes
- theelepel bonenkruid
- scheut olijfolie
- eventueel iets van peulvruchten, linzen, kikkererwten of bonen
- kerrie, koriander
- eventueel peper en zout
- blok rooktofu (real smoked tofu van Viana)

Bereiding

Als de oranje pompoen al een tijdje eerder geplukt is bestaat de kans dat de schil hard en bitter wordt. Dan is het aan te bevelen om de vrucht te schillen.
De pompoen in stukjes snijden en opzetten met water, bouillon en bonenkruid.
Aan de kook laten komen en op een laag vuur laten koken tot de pompoen bijna gaar is. Dit duurt meestal maar een minuut of 10 à 15.
Gas uitzetten en de soep pureren met een staafmixer of een vork. Niet alle blokjes pompoen hoeven vermalen te worden.

Ondertussen in een andere pan de olie verwarmen en daar langzaam de kleingesneden groenten, behalve het groen van de prei, in bakken. De kruiden meebakken.
Als de groenten gaar zijn de pompoensoep hier bij gieten, het fijngesneden groen van de prei en de appel, geschild en in stukjes, toevoegen.
Een minuut of 10 laten koken.

De eventuele peulvruchten moeten al gaar zijn als ze erbij gaan.

De tofu in blokjes snijden en hard bakken. Deze kunnen dan na het opscheppen toegevoegd worden.

Peak Phosphorus

categorieën: Landbouw algemeen, natuur en milieu, nutriënten

Overgenomen van foreignpolicy.com

Phosphorus is an essential, if underappreciated component of our daily lives, and a key link in the global food chain. And it's running out.


By James Elser, Stuart White, April 20, 2010

From Kansas to China's Sichuan province, farmers treat their fields with phosphorus-rich fertilizer to increase the yield of their crops. What happens next, however, receives relatively little attention. Large amounts of this resource are lost from farm fields, through soil erosion and runoff, and down swirling toilets, through our urine and feces. Although seemingly mundane, this process cannot continue indefinitely. Our dwindling supply of phosphorus, a primary component underlying the growth of global agricultural production, threatens to disrupt food security across the planet during the coming century. This is the gravest natural resource shortage you've never heard of.

The root of this problem has previously been the subject of presidential concern. In a message to Congress in 1938, U.S. President Franklin D. Roosevelt index.php?pid=15643">warned that the phosphorus content of American agricultural land "has greatly diminished." This shortage, Roosevelt warned, could cause low crop yields and poor-quality produce, detrimentally affecting "the physical health and economic security of the people of the nation."

Phosphorus is used extensively for a variety of key functions in all living things, including the construction of DNA and cell membranes. As it is relatively rare in the Earth's crust, a lack of phosphorus is often the limiting factor in the growth of plants and algae. In humans, it plays an essential role in bone formation. Without a steady supply of this resource, global agricultural production will face a bottleneck, and humankind's growing population will suffer a serious nutrition shortage.

The world's reliance on phosphorus is an unappreciated aspect of the "Green Revolution," a series of agricultural innovations that made it possible to feed the approximately 4.2 billion-person increase in the global population since 1950. This massive expansion of global agricultural production required a simultaneous increase in the supply of key resources, including water and nitrogen. Without an increase in phosphorus, however, crops would still have lacked the resources necessary to fuel a substantial increase in production, and the Green Revolution would not have gotten off the ground.

Roosevelt's warning was prescient and stimulated agricultural engineers to find an effective, albeit temporary, solution. To satisfy the world's growing food demand, they mobilized global mining efforts in ancient, phosphorus-rich marine deposits. By 2008, industrial farmers were applying an annual 17 million metric tons of mined phosphorus on their fields. Demand is expanding at around 3 percent a year -- a rate that is likely to accelerate due to rising prosperity in the developing world (richer people consume more meat) and the burgeoning bioenergy sector, which also requires phosphorus to support crop-based biofuels.

Our supply of mined phosphorus is running out. Many mines used to meet this growing demand are degrading, as they are increasingly forced to access deeper layers and extract a lower quality of phosphate-bearing rock (phosphate is the chemical form in which nearly all phosphorus is found). Some initial analyses from scientists with the Global Phosphorus Research Initiative estimate that there will not be sufficient phosphorus supplies from mining to meet agricultural demand within 30 to 40 years. Although more research is clearly needed, this is not a comforting time scale.

The geographic concentration of phosphate mines also threatens to usher in an era of intense resource competition. Nearly 90 percent of the world's estimated phosphorus reserves are found in five countries: Morocco, China, South Africa, Jordan, and the United States. In comparison, the 12 countries that make up the OPEC cartel control only 75 percent of the world's oil reserves.

This fact could spark international tension and even influence how countries attempt to draw their internal boundaries. Many of Morocco's phosphate mines are in Western Sahara, a disputed independent territory that is occupied by Morocco and the site of growing international human rights concerns. Reflecting these concerns, U.N.-sanctioned export restrictions on phosphate and other resources are now in place, though the efficacy of the bans is incomplete. China, the country with the largest phosphorus reserves after Morocco, imposed a 135 percent tariff on the resource as part of 2008's complex series of events in which rising fuel and fertilizer costs led to rapid increases in food prices. The tariff effectively eliminated exports. Although the tariff was subsequently lifted as the 2008 food crisis faded, the imposition of this sort of trade barrier could become a regular occurrence as supplies dwindle worldwide.

James Elser is Regents' professor of Ecology in the School of Life Sciences at Arizona State University and co-organizer of ASU's Sustainable Phosphorus Initiative.Stuart White is director of the Institute for Sustainable Futures at the University of Technology, Sydney, Australia, and co-organizer of the Global Phosphorus Research Initiative.