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This study investigated the phytotoxicity of herbicides applied singly or as mixtures to different crops under greenhouse conditions. Growth inhibition of the crops was taken as an indicator of phytotoxicity. Phytotoxicity of mixtures was estimated by calculating EC 50  value in toxic units. EC 50  (mg/kg soil) of Alachlor, Bromacil and/or Diuron were: 11.37, 4.77, 1.64, respectively, on  melon ; 0.11, 0.08, 0.24, respectively, on  molokhia , and 3.91, 3.08, 1.83, respectively, on  wheat . EC 50  values of binary mixture tests of (Alachlor + Bromacil), (Alachlor + Diuron), and (Bromacil + Diuron) were 12.21, 5.84, 10.22 on  melon , 0.982, 925.4, 38.1 on  molokhia , and 0.673, 1.34, 0.644 on  wheat . Tertiary mixture tests showed EC 50  values (TU/kg soil) of (Alachlor + Bromacil + Diuron) was 633.9 on  melon , 3.02 on  molokhia  and 32.174 on  wheat . Diuron was more toxic than Alachlor and Bromacil to the tested crops based on individual tests.  Molokhia  was the most sensitive crop to herbicides. Binary mixtures showed a synergistic effect as compared to the tertiary mixtures.

Phytotoxicity of Alachlor, Bromacil and Diuron as single or mixed herbicides applied to wheat, melon, and molokhia