Hydraulic roughness of irrigated vegetation

Also in this issue:

New species of bedbugs from Africa

Basic requirements for bargaining strength by farmer cooperative associations

Geographic origin of barley seed produces no effect on yield

A lysimeter study of sulfur fertilization of an annual-range soil

Long-term study on Tokay vineyard irrigation in Lodi area

Measuring movements of soil amendments made possible by new technique

New insecticides for lygus bug control in seed production from table beet and carrot

Forest sawflies in California

Cause and control of mosquito hatching

Study of pyridine nucleotides

Research on the aging of wine

Establishment and distribution of wasp parasite of California red scale

Some natural factors limiting the abundance of the alfalfa butterfly