Phytomeliorative efficiency of the annual grass Kochia scoparia (L.) schrad was assessed. The experiments were conducted on the solonetz of the southern chernozem. It was revealed that the application of high doses of sewage sludge (from 50 to 200 t / ha) contributed to an increase in the yield of green mass of Kochia scoparia by 133–362%. After the combined action of annual grass crops and organic fertilizers, the soil density decreased from 1.47 g / cm3 in the solonetz to 1.25 / cm3 in the variant with a dose of 200 t / ha, water resistance for three years of research increased by 37.8%, water permeability increased by more than 5 times.

The results of using the methodology for monitoring the condition of reclaimed lands disturbed by the construction of the main gas pipeline in the Saratov region are presented. On the basis of a digital elevation model, the lost and renewed volumes of soil were determined, which made it possible to quantify the development of erosion processes at the beginning of construction and installation works and after reclamation. The reason for the intensive development of erosion is revealed - non-compliance with the regulations of departmental rules for laying a gas pipeline through weakly stable soils of underlying rocks. Effective anti-erosion measures (plowing across the slope, installation of drainage shafts and drainage structures at the top of ravines) and a set of remediation work (planning, flattening, fixing the slopes of the ravine with polymer-honeycomb coatings, backfilling them with sand and gravel mixture, sowing perennial grasses) were determined.

The results of research-productive experiments on evaluation of seed inoculation and treatment of grain cereals with biological preparation BisolbiSun in dry-steppe zone of Saratov Zavolzhja are represented. The moisturing effect under the use of this preparation was also established.

No abstract

One of the problematic aspects of the fertility reproduction of irrigated soils is the lack of verified models and parameters necessary to predict the humus state. The formation of the balance of organic matter in irrigated soils is largely predetermined not only by the specificity of ecological and landscape factors of soil formation, but also by the conditions of economic use: the composition of the crop rotation, the level of production intensification, which determines the productivity of crops, ways of using by-products (grain straw) and doses of organic fertilizers. Based on the results of 18 years of observations in the production experience of the fertility parameters of dark chestnut soils, the balance linear-kinetic model of the humus state was verified. The author's approach to forecasting the humus balance of the arable layer of soils is proposed to assess the effect of the structure and productivity of the crop rotation of irrigated arable land. A quantitative assessment of dehumification processes of irrigated soils is given, due to changes in the structure of the use of arable land, where vegetable crops are  predominant.