Influence of Variable Chloride/Sulfur Doses as Part of Potassium Fertilization on Nitrogen Use Efficiency by Coffee

Chloride (Cl−) is applied in coffee at rates as a “macronutrient” the form of muriate potash (MOP). Potassium (K+) one most demanded nutrients by plant, and MOP used fertilizers production. No scientific evidence shows how Cl− with influences growth, nutrient uptake, nitrogen use efficiency (NUE). In order to address these questions, greenhouse trial over two years field four were conducted. The trials designed test influence variable Cl−/S ratios on biomass accumulation, NUE. A significant effect growth was observed under conditions but non-significant yield conditions. S significantly influenced NUE coffee. results allow us conclude that need be balanced rates, macronutrient can improve between 7 21% 9% 14% conditions, long do not exceed 180 mg L−1 80 mg·L−1 150 kg·ha−1·year−1 50 kg ha−1·year−1 field. With aim coffee, content leaves should lower than 0.33% dry matter, soil 30 mg·L−1. practical terms, farmers balance K-based avoid excessive applications reduce efficiency, especially