In rainfall simulations at erosion-control and untreated sites, volcanic soils yielded more particles that threaten Tahoe's clarity than granitic soils.

A review of prior studies, a new county survey and an abundance map by township demonstrate the noxious weed's startling spread during the past century.

Yields of Central Valley tomatoes have improved 50% without increasing water needs; new crop coefficients based on 4 years of field data were developed.