Annotation

The objective of researches was approbation of concept of the recreational biogeosystem engineering by example of phosphogypsum recycling in soil upon simultaneously rotary ameliorative tillage in the soil layer from 30 to 60 cm. The research methods were stationary, field, laboratory, computed and thermodynamic which allows evaluating the extent of sustainability of the new phosphogypsum recycling biogeosystem in chernozem. The applying of proposed concept resulted in the improvement of morphologic soil structure, the increasing of depth and uniformity of sunflower root distribution. Thus, during the crop harvest at applied dose of phosphogypsum equal to 20 t per ha a section in the soil profile of 25 cm² was crossed by 27 roots in the soil layer of 0-5 cm; 12 roots in the layer of 25-30 cm and 15 roots in 35-40 cm layer. The biological yields of studied agricultural crops increased as follows: corn for grain up to 12.44 t per ha with LSD₀₅ = 0.98 t per ha; sunflower – up to 5.73 t per ha with LSD₀₅ = 0.47 t per ha; winter wheat – up to 5.44 t per ha with LSD₀₅ = 0.35 t per ha. For replacement of mass ratio Ca/Sr it was offered the conversion factor for mol ratio which is equal to 2.1845. The decreasing of mol ratio Ca/Sr in soil solution from 382 to 125 (phosphogypsum dose 40 t per ha) was established at applying phosphogypsum in the soils of Krasnodar Territory. In the issue of the research exponential relationship between the mol ratio Ca/Sr and the quantity of applied phosphogypsum was obtained:Ca/Sr= -46.259*Ln(X)+259.302 with R²=0.8288 . The maximum dose of phosphogypsum should consider 20 t per ha. For implement of the proposed concept the device for applying into soil liquid materials during rotary tillage and mixing and decreasing of organic matter losses from soil is designed.