Cutting off supply of fertilizer bombs in Afghanistan

Washington Post:
To grasp the severity of Lt. Gen. Michael D. Barbero’s $40-fertilizer-bomb problem, it helps to consider some much bigger numbers. 
Barbero heads a U.S. military command, with an annual budget of about $2.8 billion, that was created to stem U.S. casualties from insurgent bombs. In just the past few months, he has shelled out $24 million for a new hand-held ground-penetrating radar, $33 million for mini-surveillance robots and $19 million for bomb-resistant underwear
The insurgent’s weapon of choice in Afghanistan is at the other end of the price spectrum: a plastic jug filled with ammonium nitrate fertilizer. So far this year, these cheap, hard-to-detect bombs have wounded about 3,200 U.S. soldiers and Marines, up 22 percent from 2010, according to the Pentagon. 
“We are sweeping more and more of this stuff off the battlefield,” Barbero said of the fertilizer bombs. “But it just keeps coming, and it keeps growing.” 
Almost all of the ammonium nitrate used in the Taliban’s bombs comes from two big fertilizer plants across the border in Pakistan. Barbero concluded that the best way to slow the Taliban killing was to make it harder for the insurgents to obtain the fertilizer, which is banned in Afghanistan because it can be made into explosives. 
In August, the general called Fawad Mukhtar, the chairman of the Fatima Group, which owns the fertilizer plants, and asked to meet with him in Pakistan. 
Mukhtar replied that Barbero did not need to travel. He was planning to visit the United States to drop off his son at college and promised to stop by Barbero’s office in Arlington. The two met for about 30 minutes. 
Barbero told the Pakistani businessman that the fertilizer from his plants was responsible for most of the U.S. deaths in Afghanistan. Mukhtar countered that less than 1 percent of his product fell into insurgents’ hands and was fashioned into bombs. The vast majority of the fertilizer was used for farming; people depended on his product to eat and live. 
“He is not a radical,” Barbero said of Mukhtar. “I think he wants to be part of the solution.”
...
 At the November conference, Best described how the Taliban convert fertilizer into explosives, a process he has studied for years by making and detonating crude bombs himself. 
The first step is to remove calcium carbonate, which the industry began adding to ammonium nitrate fertilizer in the 1970s to make it less explosive. Taliban bombmakers remove the calcium by pouring the fertilizer granules into a large pot of hot water. The insoluble calcium carbonate sinks to the bottom of the container. 
The insurgents then dry the ammonium nitrate solution. The final product, which looks like laundry detergent, is packed in yellow plastic jugs. Blasting caps are fashioned out of ball­point pens or glass tubes full of acid. The bombs contain no metal, making them exceptionally hard to detect. 
Best flashed a picture of one of the Taliban’s bomb-making factories on a large screen for the conference participants. “What you are seeing is a few guys living in a mud hut with no electricity,” he told the crowd.
...
The most promising solution, recommended by all four working groups, involved adding coated urea fertilizer granules to the bags of ammonium nitrate. The combination of urea and ammonium nitrate has a strong affinity for water and would be very difficult for insurgents to dry into an explosive powder.
The urea additives would not stop the insurgents from processing the fertilizer into bombs, but it would complicate their task and potentially make the blast less potent.
...
This is an example of how the US works to take away a primitive  enemy's weapon supply.  It is pretty innovative and has the potential to make it much fore difficult for the Taliban to wound or kill our troops.

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