Translocations of 2,4-D-14C Herbicides In Weed And Rice Plant On Irrigated Rice Field System

The investigation of translocation 2,4-D herbicides using 14C as tracer on irradiated rice plant system. Condition of the soil was two kinds, that is normal soil and soil 30% up normal. The soil of rice field was spray with 1μCi of 2,4-D non labelled, one week after planting. A part of rice plant and weed was determined the radioactivity after 0, 2, 4, 8, and 10 weeks after spraying. The result showed that radioactivity maximum after zero week was in root and leaf of weeds, the second weeks in root of rice, the forth weeks in rice stick, and eighth weeks in leaf of rice. This result occur at normal condition soil of solid 30 % up normal soil. The residues of 2.4-D in rice was 4,24x10-3 ppb at normal soil and 3.16x10-3 ppb at solid 30% up normal soil. This result still lower than rate of WHO/FAO, that is 0,05 ppm