1.   Biologists worry about the pollution of the Rhone and the runoff from farm fertilizers.

2.   But farm fertilizers are not the only likely culprit.

3.   Rural villages will get assistance in preventing poisonous farm fertilizers from running into streams.

4.   A siphoning hose found on the ground next to a tank filled with farm fertilizer was the first clue.

5.   Just north of Grand Forks, crews were sandbagging around the CF Industries chemical plant, a storage depot for huge quantities of anhydrous ammonia, a farm fertilizer.