فهرست نشریات علمی دسترسی آزاد ایران

Today, in a period of global climate change and environmental problems, the world is experiencing a decline in the productivity of agricultural crops. The need for effective chemical compounds that control the growth of cultivated plants and increase their productivity is increasing. In world agriculture, obtaining stimulants that are low in toxicity and highly effective, increasing plant productivity and combating various harmful insects and phytopathogenic microorganisms are important issues. It is known that 4-chlorophenoxyacetic (4-D) and 2,4-dichlorophenoxyacetic (2,4-D) acids are widely used in agriculture as herbicides and plant growth stimulants. 2,4-D, which is considered a systemic herbicide, moves easily in the plant body together with nutrients and metabolic products and leads to general poisoning (deformation of plant stems and leaves, their brittleness, growth retardation). This is an important factor in controlling perennial weeds with a well-developed root system. Contact and systemic herbicides are sprayed on the surface of the plant leaf, as well as introduced into the soil. 2,4-D has a selective effect mainly on dicotyledonous weeds, so it is widely used in monocotyledonous crop fields. On the basis of these compounds, many studies have been conducted on the synthesis of highly biologically active complex compounds and the study of their molecular and crystal structures and the determination of their mechanism of action. As a rule, these compounds exhibit herbicidal properties in high concentrations, but in microconcentrations (less than 0.001%) they serve as plant growth accelerators (stimulants).