ABSTRACT
Plant development is influenced by various endogenous and exogenous factors. The resulting physiological processes regulate the rhythm of growth and development. The growth and development processes in plants are specifically coordinated by phytohormones. They can also be influenced, however, by the specific exogenous application of bioregulators. The inhibition of basipetal auxin transport in thin cereal stands leads to increased tillering. Ethylene also delays the closing of the stomata, so that they are unable to reduce the transpiration rate when water is limited. Also, it can have a negative effect on the development of the root mass and area of the flag leaf. The soybean plant uses a considerable proportion of its energy potential in adjusting to climatic and other environmental conditions.
