Phytopharmacological value of herbicides in carrot production

Abstract

The efficiency and selectiveness of the herbicides pendimethalin (1.32 kg/ha), linuron (0.75 and 0.8 kg/ha), fluorochloridone (0.5 kg/ha), trifluralin (0.96 kg/ha), metolachlor (1.2 kg/ha), alachlor (1.44 kg/ha), prometryn (1 kg/ha), metribuzin (0.35 kg/ha) and their combinations were studied in carrot crop in 1993. and 1994. We evaluated the efficiency of the herbicides in weed control and their effect on the crop (phytotoxicity, yield, length and diameter of the root, diameter of the root core and plant height). The dominant weed species in 1993 were Galinsoga parviflora, Sinapis arvensis, Chenopodium album and Hibiscus trionum, and in 1994 Galinsoga parviflora, Datura stramonium, Amaranthus retroflexus and Chenopodium hybridum. The studied herbicides and their combinations showed to be highly efficient with respect to the dominant weed species. Metribuzin showed to be poorly efficient in control of Galinsoga parviflora (75 - 76%) and Solanum nigrum (72.5 - 83.5%). Fluorochloridone showed to be poorly efficient in control of Datura stramonium (55%) and Hibiscus trionum (67.5 - 80.5%). Linuron, metribuzin and fluorochloridone caused temporary phytotoxicity while only metribuzin significantly reduced the yield, length, diameter of the root and diameter of the core of the carrot plants.