Another service? http://hqporner.in.net/ hdporn Uralkali, a key Russian partner in an informal cartel which has helped to keep prices of the fertilizer artificially high, broke ranks this week, sending shares of the main producers crashing and leading to predictions of a fall in the price of potash of up to 30 percent. Uralkali did so after accusing a partner of selling outside an agreement, but also after users proved resourceful in sourcing alternatives and, importantly, before the completion of huge new projects which would bring on new supply in coming years.