INFLUENCE OF MINERAL FERTILIZERS AND IRRIGATION REGIMES ON THE DEVELOPMENT AND PHOTOSYNTHETIC ACTIVITY OF BARLEY (<i>HORDEUM SATIVUM</i> L.)
This article discusses the timing of the onset of phases and the duration of interphase periods, weediness of the experimental site, changes in photosynthetic parameters under different irrigation regimes and doses of mineral fertilizers. Barley is highly responsive to fertilizers. An important condition for obtaining high yields of agricultural crops is the maintenance of the required amount of nutrients in the soil. Fertilizers are the most important tool for agricultural intensification. They increase the content of basic nutrients, increase the yield of agricultural crops. Increasing the efficiency of fertilizer use is a pressing issue. Spring barley is widely used for food, feed and technical purposes. This is a very plastic and early ripening crop, which gives high and stable yields over the years. In the course of research it was found that the most efficiently assimilating leaf surface of mid-season barley Zeus worked at an irrigation mode of 80% lowest moisture capacity and the application of N<sub>60</sub>P<sub>45</sub>K<sub>45</sub>. The NPP in this variant of the experiment was found to be 5.4 g / m<sup>2</sup> per day.