The publication of this Handbook was supported by the Russian Federation

Amelioration of Soda-Solonetz-Solonchak. Experimental tests were conduced at the EPU-
2012 site with the aim of  studying the improvement of  alkaline soils by applying soil treatments 
with chemical ameliorators in combination with measures for storing water in soil from winter, 
spring and summer precipitation [3, 5]. The experimental site was located on Soda-Solonchak-
Solonetz and had an area of  0.15 ha. The experimental treatments were applied in 3 replications 
on experimental plots 150 m2 each and included the following:
1.  Control.
2.  Phosphogypsum, 30 t/ha + ash, 15 t/ha (50% - i.e., half  dose)
3.  Phosphogysum, 60 t/ha + ash, 30 t/ha (100% - i.e., full dose).
The full dose of  phosphogypsum application rate was calculated with corrections for moisture 
content, particle size and wind speed (more than 6 m/s) – up to 30% loss of  ameliorators. The 
experimental treatments also included variations in soil tillage.