# Biogeochemical State of Salinized Irrigated Soils of Central Fergana (Uzbekistan, Central Asia)
## 3 Results and Discussion
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Soil Section**} & \multirow{2}{*}{**Depth, cm**} & \multicolumn{6}{c}{**Particle Size, mm**} & \multicolumn{1}{c}{**<0.01 mm**} \\ \cline{3-10}  & & **1–0.25** & **0.25-0.1** & **0.1–0.05** & **0.05–0.01** & **0.01–0.005** & **0.005–0.001** & **<0.001** \\ \hline \multirow{4}{*}{1} & 0–29 & 12.7 & 18.4 & 17.2 & 12.8 & 13.5 & 11.3 & 14.1 & 38.9 \\  & 29–44 & 13.5 & 17.3 & 18.4 & 14.1 & 12.3 & 11.0 & 13.4 & 36.7 \\  & 44–67 & 15.4 & 21.6 & 17.9 & 13.7 & 11.7 & 10.4 & 9.3 & 31.4 \\  & 67–102 & 12.1 & 24.9 & 19.2 & 15.7 & 8.5 & 9.4 & 10.2 & 28.1 \\  & 102–132 & 17.3 & 25.4 & 20.7 & 17.3 & 6.2 & 7.6 & 5.5 & 19.3 \\ \hline \multirow{4}{*}{12} & 0–28 & 18.1 & 15.6 & 17.0 & 11.9 & 12.9 & 10.7 & 13.8 & 37.4 \\  & 28–42 & 12.6 & 13.9 & 18.5 & 14.3 & 15.2 & 13.3 & 12.2 & 40.7 \\  & 42–72 & 14.3 & 17.6 & 23.5 & 15.8 & 8.4 & 7.8 & 12.6 & 28.8 \\  & 72–131 & 17.2 & 25.7 & 18.1 & 19.4 & 6.5 & 5.3 & 7.8 & 19.6 \\  & 131–152 & 19.7 & 20.8 & 21.6 & 16.3 & 6.8 & 6.5 & 8.3 & 21.6 \\  & 152–200 & 16.8 & 21.6 & 19.5 & 15.7 & 9.1 & 7.8 & 9.5 & 26.4 \\ \hline \multirow{4}{*}{20} & 0–30 & 10.6 & 14.3 & 21.4 & 19.2 & 11.4 & 11.0 & 12.1 & 34.5 \\  & 30–45 & 12.7 & 15.4 & 19.1 & 20.1 & 10.3 & 10.6 & 11.8 & 32.7 \\  & 45–62 & 10.2 & 17.4 & 12.3 & 11.6 & 14.2 & 18.7 & 15.6 & 48.5 \\  & 62–97 & 18.4 & 21.7 & 17.6 & 15.5 & 8.6 & 10.3 & 7.9 & 26.8 \\  & 97–120 & 17.6 & 23.2 & 20.4 & 15.8 & 8.2 & 8.1 & 6.7 & 23.0 \\ \hline \multirow{4}{*}{24} & 0–30 & 11.2 & 17.5 & 19.2 & 18.4 & 10.7 & 13.2 & 9.8 & 33.7 \\  & 30–46 & 12.7 & 15.4 & 19.1 & 22.1 & 8.9 & 10.6 & 11.2 & 30.7 \\  & 46–75 & 14.9 & 16.5 & 21.6 & 19.7 & 7.4 & 9.6 & 10.3 & 27.3 \\  & 75–92 & 21.4 & 18.9 & 19.9 & 15.3 & 8.6 & 7.4 & 8.5 & 24.5 \\  & 92–109 & 14.5 & 17.2 & 21.4 & 18.7 & 8.7 & 10.2 & 9.3 & 28.2 \\ \hline \multirow{4}{*}{28} & 0–35 & 10.2 & 14.7 & 16.2 & 11.4 & 13.5 & 15.3 & 18.7 & 47.5 \\  & 35–54 & 9.5 & 16.1 & 17.7 & 10.6 & 12.0 & 16.7 & 17.4 & 46.1 \\  & 54–72 & 13.1 & 15.3 & 18.4 & 12.6 & 10.5 & 13.9 & 16.2 & 40.6 \\  & 72–91 & 12.7 & 18.6 & 19.2 & 15.3 & 8.3 & 14.5 & 11.4 & 34.2 \\  & 91–140 & 10.6 & 13.5 & 15.6 & 12.0 & 15.9 & 14.6 & 17.8 & 48.3 \\ \hline \multirow{4}{*}{35} & 0–30 & 10.4 & 14.6 & 20.4 & 18.2 & 12.3 & 11.5 & 12.6 & 36.5 \\  & 30–43 & 12.5 & 14.9 & 19.1 & 20.1 & 10.9 & 11.9 & 11.5 & 34.3 \\ \cline{1-1}  & 44–86 & 15.0 & 17.7 & 21.8 & 21.8 & 9.1 & 7.2 & 7.4 & 23.7 \\ \cline{1-1}  & 86–129 & 24.7 & 14.6 & 15.7 & 16.4 & 8.6 & 10.3 & 9.7 & 28.6 \\ \cline{1-1}  & 129–195 & 15.4 & 17.5 & 20.3 & 18.9 & 10.5 & 9.6 & 7.8 & 27.9 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Particle size distribution in soil sections. in terms of lithology. The more intensive accumulation of fine particles in the upper horizons of old irrigated soils compared to recently irrigated soils also testifies in favor of the irrigated hypothesis of the transformation of the particle size distribution. Figure 3: Texture triangles of soils investigated. Data on water-soluble salt content are given in Table 3. Due to specific soil-climatic conditions of Central Fergana, these soils are gypsum and carbonate and chloride-sulfate salinity type, dry residue after leaching is relatively high, dry residue in studied meadow saz and meadow takyr soils varies by about 0.505-0.926% as expected, while the highest indicator corresponds to gypsum. Magnesium sulfate stands second after gypsum and the positive correlation between them is 0.9; the process of leaching out of chloride salts is observed up to limits of the threshold concentration. The results of research are presented on the number and migration of macroelements in the soil, the geoenergetic properties, and the amounts of trace elements, the geochemical properties of biogenic microelements, the assessment of heavy metals and metalloids in the soil and their pollution levels, the quantity and differentiation of the heavy metals and metalloids in the soil.