Annotation

Purpose: to determine the impact of phosphogypsum rates in combination with organic matter on the properties of integrated cover soils, their productivity, and also to substantiate the economic feasibility of their application for chemical reclamation during irrigation. 

Materials and methods. The studies were carried out in the Martynovsky district Rostov region for 4 years on the integrated cover soils according to the scheme of the experiment, including the application of phosphogypsum (Ph) and organic matter (OM) at certain rates. The studies were carried out according to generally accepted methods. 

Results. It has been stated that the phosphogypsum application at 10 t/ha rate contributed to the southern chernozem desalination up to 3 % sodium from the total soil-absorbing complex and an calcium and magnesium increase to the optimal parameters for this soil. On the solonetz, the content of exchangeable sodium decreased to 9–8 % in the variants with 10 t/ha Ph rate. In the variant with 5 t/ha Ph rate, the process of soil salinization proceeded somewhat more slowly, which is associated with an insufficient ameliorant rate for the solonetz. The accumulation of humus to the greatest extent was observed in the variant 10 t/ha Ph + 40 t/ha OM. After 4 years, it amounted to 0.24 % on the southern chernozem, and 0.19 % on the solonetz. Both soils included in the complex decompacted, and in the better option, the southern chernozem density was 1.17 t/m³, and on the solonetz – 1.20 t/m³. The soil properties improvement contributed to the increase in productivity. By the 4th year of the aftereffect of ameliorants, it increased by 73–85 % on the southern chernozem and by 69–79 % on solonetz compared with the control. The average productivity for 4 years of research on the southern chernozem ranged from 7.18 (5 t/ha Ph + 40 t/ha OM) to 8.03 t grain units/ha (10 t/ha Ph + 40 t/ha OM), and in the control 4.82 t grain units/ha. On the solonetz, respectively, it increased from 6.03 to 6.93 t grain units/ha, in the control – 4.30 t grain units/ha. 

Conclusions: the application of phosphogypsum with organic matter provides both reclamative and economic effect on solonetz integrated cover soils.

doi: 10.31774/2712-9357-2022-12-4-1-19

For quoting

Dokuchayeva L. M., Yurkova R. Ye., Babichev A. N. The efficiency of phosphogypsum application with organics for integrated cover soils during irrigation. Land Reclamation and Hydraulic Engineering. 2022;12(4):1–19. (In Russ.). https://doi.org/10.31774/2712-9357-2022-12-4-1-19.

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