Uptake and utilization of sulfur by range clovers are increased by sulfur fertilization but may be limited by low temperatures, according to controlled-environment tests. If the level of available sulfur in the soil is low, higher temperatures do not appear to aid in plant uptake of sulfur. A form of sulfur with a high degree of availability would be best for greatest plant response in warm spring months—although leaching losses may occur in the event of excessive rainfall. Uptake and utilization of fertilizer sulfur was notably greater for subterraneon clover than for rose clover.

This was a cooperative investigation by the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the University of California Agricultural Experiment Station, Davis.