The side effect of four herbicides, pendimethalin, oxyfluorfen fluazifop –P– butyl and clethodim on certain
peanut characteristics such as chlorophyll dry weight of each of plants and pods, oil and protein contents of the seeds were estimated. The herbicides at complete recommended and at half rates with or without KZ oil were applied. The results clearly showed that the highest increase in chlorophyll (a, b and total) was obtained with the treatment of clethodim at half rate + 1500 ml oil; whereas the treatment of clethodim at half rate without oil recorded the lowest effect during 2004 and 2005 seasons. The results also revealed that the highest effect on dry weigh of each of plants and pods was more pronounced for the treatment of the half rate of clethodim plus 1500 ml of mineral oil. The herbicides had no effect on each of oil and crude protein content of peanut seeds.