The railroad hauled lumber, furniture, farm chemicals and scrap, but was originally built to haul tobacco to market.

It would also reduce pollution from other farm chemicals.

Grain, farm chemicals and fertilizer are shipped in barges along the river, largely for export overseas.

The poisonous effects of pollution from farm chemicals is blamed for the species' demise.

Weeds and insects develop genetic resistance to farm chemicals, often forcing farmers to use ever greater amounts to achieve the same effect.

The use of farm chemicals, moreover, was coming under attack by environmentalists and consumer groups.

These groups have already battled to a stalemate, and Congress has been unable to decide on several important proposals affecting farm chemicals.

There are also confused reports that the average production rate has declined due to the reduced application of necessary farm chemicals.

For most of the farm chemicals it regulates, good studies do not exist.

This experimental finding, that the reduction in yields associated with the nonuse of farm chemicals averaged only 12 percent, has important economic and environmental implications.