Akademik Veri Yönetim Sistemi
Journal of Crop Health, cilt.78, sa.3, 2026 (SCI-Expanded, Scopus)
In sustainable agriculture, effective weed control is vital for healthy plant growth and high yields. Understanding how herbicides affect industrial hemp is therefore essential. This study evaluated the effects of different herbicides on hemp morphology, yield, and yield components under field conditions in Kayseri, Türkiye, during 2022 and 2023. Nineteen treatments were tested: 15 herbicides (2 pre-planting, 7 pre-emergence, and 6 post-emergence), a weedy control, a weed-free control, and two hoeing treatments. Pre-emergence herbicides pyroxasulfone, pendimethalin, s‑metolachlor, and pendimethalin + clomazone and the weed-free control produced similar results. These treatments resulted in taller plants, thicker stems, longer technical stem length, higher biomass, and greater fiber and seed yields. They effectively reduced early-season weed competition without causing crop injury. In contrast, several post-emergence herbicides, including bentazone, bromoxynil, and diuron, caused noticeable phytotoxicity. These treatments led to shorter plants, thinner stems, reduced technical stem length, and significant declines in biomass, fiber yield, and seed yield. A strong relationship was observed between plant morphology, biomass production, and yield. Morphological traits, particularly technical stem length and stem thickness, proved to be reliable indicators of fiber productivity. Overall, yield losses were mainly associated with herbicide-induced crop injury and the harmful effects of weed competition. These findings emphasize that selecting herbicides that are safe for hemp is just as important as effective weed control for sustaining productivity.