Efficiency of Fertilizers Under Agricultural Crops in Different Soil–Climatic Conditions of Azerbaijan
Vugar Jafarov1* 
, Elvin Kerimli2 , Ismayil Mursalov2 , Jalal Alasov2
Abstract. The Republic of Azerbaijan has a very rich natural environment. The geography and relief of the republic, and the formation of manifestations of eleven climatic belts in this territory, have played an important role in the formation of soil–climatic conditions and, overall, of the landscape. For this reason, the soil types formed within the republic are favorable for the development of various branches of agriculture. Under the soil–climatic conditions of the republic, it is possible to develop fruit growing, viticulture, vegetable growing and other agricultural cultivation and obtain high yields from these fields. In the article, the main regularities of fertilizer efficiency under agricultural crops in various soil–climatic zones of Azerbaijan have been investigated. Thus, in the Kura–Araz and Lankaran plains, under different soil–climatic conditions, the characteristics of crop cultivation and the results of scientific research on the efficiency of fertilizer application under cotton and tomato on irrigated meadow-gray and meadow-marsh soils are presented. The scientific analyses carried out show that the effectiveness of fertilizers varies significantly depending on soil texture, humus reserves, soil reaction, and climatic factors. It has been determined that in the irrigated meadow-gray soils of the Mughan–Salyan zone and in the meadow-marsh soils of the Lankaran–Astara zone, the combined application of organic and mineral fertilizers under cotton and tomato has a better effect on increasing soil fertility and crop productivity compared to variants where they were applied separately.
Keywords: cotton, tomato, Mughan–Salyan, Lankaran–Astara, meadow-gray, meadow-marsh, fertilizer, crop, productivity, nitrogen, phosphorus, potassium