The presence of endosulfan sulfate also significantly decreased chlorophyll content of cucumber, especially that of chlorophyll b. The chlorophyll b contents of cucumber leaves when grown either alone or together with sweet corn and cowpea in endosulfan sulfate- spiked soil were only, respectively, on day 45. In comparison, the corresponding values in leaves of cucumber grown in control non-spiked soil were , respectively. The chlorophyll a and total chlorophyll contents of cucumber grown alone and together with sweet corn or cowpea in endosulfan-sulfate spiked were significantly lower than corresponding values in control cucumber plants grown in non-spiked soil, although the decrease was not as drastic as that seen for chlorophyll b.