In contrast to sweet corn and cucumber, endosufan sulfate appeared not to affect the chlorophyll contents of cowpea leaves irrespective of whether of whether the plant was cultivated alone or together with another plants. In fact,on day 60, the leaf chlorophyll a, chlorophyll b, and total chlorophyll contents of cowpea grown in endosulfan sulfate-spiked soil was generally higher higher than those of controls grown in non-spiked soil.