INFLUENCE OF SOWING RATES AND FERTILIZERS ON THE DYNAMICS OF THE CONTENT OF PHOSPHORUS AND POTASSIUM IN THE SOIL, DEPENDING ON THE DEVELOPMENT PHASES OF WINTER BARLEY ON LIGHT-CHESTNUT SOILS IN THE CONDITIONS OF BOGARA

The article summarizes the main agrochemical parameters in the light-chestnut soil of experimental field of Gobustan Regional Experimental Station situated in the territory of the cadastral district of Mountainous-Shirvan, on the southeast slope of the Greater Caucasus Mountains Range in Azerbaijan have been determined. The precipitation, which is the main limiting factor in rainfed regions,was quantified for the 2016-2019 vegetation years. The values of pH in the plowing layer (0-25 sm) was found to range between 8.1-8.4 (25-50 cm), and 8.7-8.8 (50-70 cm). So the plowing layer had weak and lower layers had strong alkaline properties. The soil contains carbonates. The fields of Gobustan RES (Maraza area) are of medium quality soils. Total humus ranged from 2.23 % to 2.29 % in the plowing layer and decreased in the lower layers. Total nitrogen at the depth of 0-25 cm was 0.165 %-0.179 %, which decreased in the lower layers. The analysis shows that the average amount (in 4 years) of easily hydrolyzed nitrogen at a depth of 0-25 cm varied between 45-74 mg per 1 kg soil, 25-31 mg at a depth of 25-50 cm and 13-17 mg at a depth of 50-70 cm. The total phosphorus content at 0–25 cm depth ranged from 0.18 % to 0.12 5 %, depending on the years of the study, and gradually decreased in the lower layers.The amount of active phosphorus was 30.4-33 mg/kg at a depth of 0-25 cm during 4 years, and amount of variable potassium was 269-292 mg/kg, which gradually decreased in the lower layers. Dynamics of phosphorus and potassium in soil was determined in relation to the growth stages, sowing and fertilizer rates of the “Jalilabad 19”barley variety.

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