Abstract
Rice (Oryza sativa L.) is an important cereal species that meets the basic nutritional needs of a large portion of the world's population through its processed product (rice). One of the problems encountered during its production is weeds. Weed control in production areas is widely carried out through herbicide use in our country and worldwide. In this study, it was aimed to determine the effects of herbicide types used in rice agriculture and different dose applications of these herbicides on photosynthetic pigments (total chlorophyll, chlorophyll a, chlorophyll b, carotenoid), total protein, and malondialdehyde (MDA) amounts in the widely cultivated Osmancık-97 rice variety. Quinclorac, cyhalofop butyl, and bentazon+MCPA were used as herbicides, and D dose (recommended dose) and 2D dose (double dose) applications were performed. Additionally, a mixture (mix) application combining equal amounts of these three herbicides was also carried out. Plant samples from both control and treatment groups were collected at seedling, stem elongation, and panicle formation stages, and analyses were performed. The findings of this study indicate that unconscious use of excessive herbicide doses and the use of multiple herbicides in mixture during production negatively affect the development of rice plants due to decreases in photosynthetic pigments. Therefore, to reduce the negative effects of herbicides used in weed control in production areas, polyculture farming instead of the widely preferred monoculture farming in rice production as a practice to prevent weed proliferation, elimination of weeds before seed formation, weed cleaning in irrigation channels, use of certified seeds, and in chemical control, use of herbicides at recommended doses following product instructions should be ensured.
| Keywords: | Oryza sativa L. Herbicide Photosynthetic pigment Malondialdehyde |