بررسي ميزان جذب و انتقال علف كش توفوردي طي مراحل رشد خرفه، سلمه تره و تاج خروس با استفاده از تكنيك رديابي كربن- 14

Studying the rate of Absorption and Translocation of 2, 4-D in Common Pursuance, Common lambs quarters, Red root pigweed during different growth stages by using of 14C Tracer Technique

To study the rate of absorption and translocation of 2,4-D during different growth stages of Red Root Pigweed. Common Lambsquarlers & Common Purslane, this experiment was carried out at the Nuclear Research Center lor Agriculture and Medicine in Karaj (1382-83). Four different growth stages oi" weeds (including: 4 and 8 leaf stages, starting of reproductive stage and flowering) were produced under the green house condition, leaves inoculated by labelled 2,4-D with activity of 0/08 pCi (in each 10 fili of solution), through the adaxial surface, extraction and counting of labelled herbicide showed that, absorption and translocation of 14C2.4-D at Common lambsquarlers is the lowest rate and at Common Purslane is the highest. Rale of I4C2, 4-D translocation was significantly different during growth stages of Red root pigweed and Common lambsquarters. Rate of translocation decreased in Reproductive stage but sensitivity to 2, 4-D increased during this growth stage.