The Effect of Irrigation Intensity on the Seasonal Dynamics of Mobile Forms of Macroelements in Tea Plantations in Podzolic-yellow Soils
Namig Asgarov1* , Afiaddin Mirzayev1
Abstract. The aim of the study was to substantiate the effect of a combination of mineral fertilizers (N₁₈₀P₁₂₀K₉₀), local Lankaran compost (20 t/ha) and different irrigations (5, 7, 9 times) during the vegetation period on the humus state of the soil, the distribution of mobile forms of nitrogen, phosphorus and potassium along the profile in undegraded and moderately degraded podzolic-gley-yellow soils located under tea plants in the Lankaran climatic zone. The experiment was conducted according to a two-factor scheme with 4 biological replications: factor I - the degree of soil degradation (undegraded and moderately degraded); factor II – fertilizer-irrigation regime (control, mineral-organic background, background + 5/7/9 irrigation). Soil samples were taken from 0-20 cm and 20-40 cm layers during the vegetation culmination period, and humus, nitrate (N-NO₃), ammonium (N-NH₄), mobile phosphorus (P₂O₅) and exchangeable potassium (K₂O) were determined. In order to restore fertility and increase productivity in podzolic-gley soils under tea plantations of the Lankaran zone, 7 irrigations during the vegetation period against the background of N₁₈₀P₁₂₀K₉₀ + compost (20 t/ha) are recommended as the optimal agrotechnical solution. This regime creates a balance between restoring humus reserves, ensuring biological accessibility of nutrients and efficient use of water resources.
Keywords: podzolic-gley soils, degradation, tea plantation, mineral fertilizers, Lankaran compost, vegetation irrigation, humus, mobile nutrients, Lankaran zone