Research previews

Also in this issue:

Herbicide residues in California agricultural soils

Sudangrass greenchop yields reduced by wheel damage during harvesting

Research with nitrogen fertilizer emphasizes fertilize crop—not crop residue

Harland barley

Comparison of three commercial drain tiles in a heavy clay soil of Imperial Valley

Carbamate herbicides—new tools for cytological studies

Magnesium deficiency in cut-flower chrysanthemums

Phosphorus deficiency decreases stomatal activity and water use of plants

Pricing efficiency in the manufactured dairy products industry