Study of some fertility characteristics of soils with different agricultural uses in the Aqra Region/Duhok

A study was conducted in the Aqra region to investigate the fertility characteristics of soils with different agricultural uses. The study included (40) sites, representing surface soils (0-30 cm). Soil samples were transported to the laboratory for physical and chemical analyses. The results showed that the majority of the studied soils were heavy soils with clayey texture (C) to clay loam texture (CL) and sandy clay loam texture (SCL). The pH values were mostly neutral in specific sites and slightly alkaline in most of the studied sites, Nitrogen values ranged between (6.27 – 43.90) ppm. Phosphorus values ranged between (1.05– 30.56) ppm, and it is natural for phosphorus dissolution to decrease due to plant absorption, adsorption, and fixation over time. This indicates a significant consumption of phosphorus in the soil, possibly attributed to elevated temperatures at the end of the season and reduced irrigation operations before harvest, leading to decreased phosphorus dissolution and increased fixation. The ratios of N in Kriging ranged between (27.44 - 32.61) represented the majority of the studied area, while he P for the first five categories ranged through the program between (1.05-9.70). and K for rest of study sites had low and variable values, as they appeared in red and light yellow, and their values ranged between (190 - 374).