Selectivity and efficiency of some herbicides in controlling weeds from monoecious hemp crops

Abstract

The herbicides tested in the monoecious hemp crops from the Agricultural Research and Development Station of Secuieni, Neamţ County, on a typical Cambic Chernozem with 2.7% humus, 34% clay and a pH of 5.8, have shown a high degree of hemp susceptibility to herbicides. Herbicides Guardian (2.2 l/ha), Dual Gold (1.5 l/ha) and Fusilade forte (1.0 l/ha) were better tolerated by hemp crops, while herbicides Sencor, Lontrel 300, Logran and Granstarm were not tolerated. As concerns the efficiency of herbicides in controlling weeds, we found out changes in the dynamics of weed encroachment, differentiated according to used herbicides and climatic conditions. Guardian (2.2 l/ha) and Dual Gold (1.5 l/ha) have controlled annual mono- and dicotyledonous weeds by 65 and, respectively, 55%. The obtained seed yields were influenced by herbicide selectivity and efficiency, but also by climatic conditions.