Removal of Basic Nutrients (Npk) by Apple Trees Using Various Types of Potassium Fertilizers in the Conditions of Azerbaijan

In the experiment field on irrigated meadow - brown soil was found that at low soil provision of exchangeable potassium in apple orchards applying of different types of potash on a background of organic fertilizer (20 t ha⁻¹ of manure), significantly increases the accumulation of the main nutrient elements in leaves and fruits, and also takeaway NPK with apple harvest (classical orchard - ʻGolden Deliciousʼ variety and intensive orchard - ʻFuzhiʼ variety). The best variant was the sharing of organic fertilizer system (20 t ha⁻¹ of manure - as background) with the high dose of potassium sulphate (K₁₆₀): compared with the control variant (without fertilizers), the yield was higher by 9.9 t ha⁻¹ or 7.87%, and the removal of nitrogen, phosphorus and potassium from the soil - by 69.0 kg ha⁻¹, 46.3 kg ha⁻¹and 120.4 kg ha⁻¹, respectively; and compared with the background + K₁₆₀ potassium chloride variant, these indicators were higher by 0.95 t ha⁻¹, or 4.2%, respectively: 6.2 kg ha⁻¹, 7.1 kg ha⁻¹ and 14.2 kg ha⁻¹. This variant was also effective in relation to the accumulation of nitrogen, phosphorus and potassium in the leaves and fruits of the apple trees, as well as the removal with harvest in classical orchard. Similar results were obtained using organo -mineral system fertilizer - 20 t ha⁻¹ manure + K₁₆₀ potassium sulphate also in intensive orchard.