Preliminary studies with single applications of 2 and 6 lbs. sulfur to 10 sq. ft. calcareous soil (well suited for spinach production but not for cowpeas and some other leguminous crops because of lime-induced, non-infectious chlorosis), with acid-neutralizing capacity equivalent to 41.66% CaCO3, con-trolled chlorosis on 7 successive crops of Brabham cowpeas and induced sturdier growth in a period of 5 yrs. without indication of dimunition. Similar applications to neutral or slightly acid sandy soil inhibited germination of the cowpeas. The S also increased root-nodule formation by rhizobia present naturally in the soil. The average total wt. of nodules per plant was correlated with the intensity of green color of the leaves. The original pH8 of the soil underwent gradual decrease but the differences between the treated and non-treated soils remained insignificant. Significant changes in the pH may have occurred in localized areas along the root channels. Several crops of spinach grew well on the sulphur-treated soils. Because of the relatively small amts. of S oxidized in 5 yrs., it is probable that its effect may be beneficial for many years, even with lighter applications.