INFLUENCE OF DIFFERENT SYSTEMS OF FERTILIZERS ON MODULAR STRUCTURE OF ALLUVIAL MEADOW AND FOREST AND MEADOW-BROWN SOILS OF DRY SUBTROPICS OF AZERBAIJAN

Abstract

The results of researches of structural-aggregate composition change of alluvial meadow-forest soils under vegetable crops (tomato) and irrigated meadow-brown soils under fruit crops depending on fertilizer system are presented at the article. Application of organic fertilizer (cattle manure) improves the structural state of the investigated soils to the greatest extent - the content of agronomically valuable aggregates in the arable horizon increased by 17,6 % and 8,7 % in the subsurface layer compared with the control, the values of the coefficient of structure increased 1,3 times and amounted to 2,5 and 2,1 respectively. The use of organo-mineral system of fertilizers (manure + nitrogen, phosphorus and potassium) has a positive impact on the structure of alluvial meadow-forest soils under vegetable crops. Application of 20 t/ha manure + N₆₀P₉₀K₁₂₀ also improved aggregate composition - increased the content of agronomically valuable aggregates in comparison with the control on 14,1 and 9,8 % in arable and subsurface layers respectively, and coefficient of structure - on 0,9 and 0,8 respectively. Similar results were obtained on Irrigated meadow-brown soils under fruit crops.