Experimental studies of the effect of lighting on eutrophication of water bodies and the operation of drip irrigation systems

The article discusses the results of experimental studies of factors influencing the occurrence of eutrophication of water bodies. The problem of surface water pollution became particularly relevant in the 20th century. This is mainly due to the development of industry and urban growth. The entry of huge amounts of pollutants into water bodies leads to the degradation of both individual components of the ecosystem and entire groups of water bodies. This, in turn, causes a reduction in freshwater supplies at the local and regional level. Since the middle of the 20th century, there has been a rapid increase in the number of eutrophicated reservoirs and the unsuitability of water for drip irrigation systems due to clogging of emitters associated with the development of algae and bacteria in surface irrigation sources. To clean drippers, chlorination is used by adding sodium hypochlorite in liquid form (NaOCl) or solid form of calcium hypochlorite (Ca(OCl)2) to irrigation water, which suppresses the development of algae, which negatively affects the soil and the products produced. The purpose of the study is to identify the influence of the degree of shading of the water surface on the growth and development of blue-green algae, as well as on the pH value, carbonate hardness and content of nutrients in water, and its further suitability for drip irrigation. As a result of the research, the dynamics of algae development was established depending on the degree of illumination of the water surface and changes in the content of biogenic elements in it.

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