Abstract
In this article, the effect of applying different doses of organic fertilizers obtained from city sewage sludge to lawn plants is studied: 5 t/ha, 10 t/ha, 15 t/ha. During the study, the influence of different doses of sewage sludge on the chemical composition of the soil, biological activity and green mass of lawn plants was considered. The nature of changes in the indicators of nitrogen and mobile phosphorus in the soil was directly dependent on the dose of sewage sludge in different periods of lawn growth. When applying 10 and 15 t/ha of sewage sludge, the microbiological activity of the soil increased, an increase in the content of nitrogen and phosphorus in the soil by 2-2.5 times was observed. Cellulosic activity also increased with an increase in the dose of sewage sludge. The microbiological activity of the soil reached 80% in the variant with the application of 15 t/ha of organic fertilizer, while the indicator of the control variant was only 5%. The average value of the green mass of lawns for the variant of 10 t/ha was higher than the control in 2 times, and 15 t/ha – in 2.5 times. As a result, it was determined that 10 t/ha and 15 t/ha are the most optimal for the growth of lawn plants.