A lysimeter study, to determine the rate and frequency of sulfur fertilization and the source of sulfur for maximum returns, was initiated with the annual legume, rose clover, on Vista sandy loam. Such factors as the availability of sulfur in the soil, sulfur supplied by precipitation and air contact, leaching losses, and the uptake of sulfur by clover plants were considered in the study.

The Pacific Southwest Forest and Range Experiment Station, U. S. Forest Service, cooperated in the experiments.