Seed germination and the green weeds is most important step in determining the potential of its population in agricultural ecosystems. Pigweed and Chenopodium album weed seeds with high productivity of the farms are the dominant. Because of the high seed production are the dominant species in the seed bank of weed seed in soil and presence of so many years to farms. Only conditions and soil properties can affect the seed bank. One factor that can weed seed bank in soil Allelopathic compounds effectively. These compounds have different effects on weed seeds and the presence of compounds Allelopathic can be change crops. This experimental was Allelopathic corn in various combinations for treatment prior to germination tests at different temperatures that determined to the role of these factors in controlling Pigweed and Chenopodium album seeds in weed seed bank. Results showed that Allelopathic combinations with high concentration and more time contacts had more effect. However Allelopathic compounds more susceptible to weed seeds and the germination of those compounds was reduced. Treatment by 7 hours rate germination decreased this decrease was much more Chenopodium album. Pigweed seed germination in a long time had a significant decrease. Allelopathic a time contacts of plant compounds and weed seeds with the different compounds effect on a variety of weeds.
