Annotation

Purpose: to determine the possibilities of applying green manure crops to increase the organic matter content in sewage water sludge. 

Materials and methods. The research included vegetation experiments with sowing test plant seeds in soil samples from Aksay district Rostov region and in three-year-old sewage sludge from the Kadamovskie sewage treatment plants in Novocherkassk. 

Results. The phytotoxic effect was assessed based on seed germination and plant biomass. The data obtained indicate a significant inhibitory effect of sewage water sludge on the germination of radish and white mustard seeds (it decreased more than twice), while the germination of garden cress seeds decreased by 31 % and that of oats and vetch by only 11 %. Based on the data on the average mass of one plant in the case of their cultivation in sludge, a stimulating effect was noted for all test plants during the observation period. The greatest increase in the biomass of one plant in comparison with the control data was noted for garden cress, the least – for white mustard. Analysis of the sediment composition data after growing the test plants showed the consumption of organic matter and nutrients in all variants except for the green manure mixture, where, against the background of the consumption of nutrients, the organic matter content increased almost one and a half times – from 11.48 to 16.8 %. 

Conclusions. Statistically reliable data were obtained on the increase in humus in sewage sludge after growing the green manure mixture: its content increased by 49 % while leaving only the root system of plants in the sludge. At the same time, the phosphorus content decreased by 20 %, which is within the margin of error of laboratory measurements. The nitrogen content after growing the green manure mixture decreased slightly – by 8 %. The obtained data indicate the possibility of enriching sewage water sludge in organic matter by sowing siderate grasses, which can be carried out directly on sludge maps.

For quoting

Manzhina S. A., Rusin L. I. Possibility of increasing the organic matter content in sewage sludge by using siderates. Ways of Increasing the Efficiency of Irrigated Agriculture. 2024;94(3):33–50. (In Russ.).

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