In this work, the potential risk of nutrient leaching is evaluated when using different fertilization strategies with fresh laying hen manure before sowing on a calcareous soil with a high phosphorus (P) available content. The treatments were: mineral fertilizer (M1: 61 kg N ha⁻¹), two treatments only with laying hen manure (M2: 105 kg N ha⁻¹ y M3: 210 kg N ha⁻¹), and one combined mineral fertilizer and laying hen manure (M4: 359 kg N ha⁻¹). Two months after fertilization, a laboratory leaching columns assay was performed with the 0.30 m height. The electrical conductivity in the first drainage was higher in the M4 treatment (0.90 dS m⁻¹) than in the rest of the treatments and it decreased in subsequent drainages with similar values between treatments (~0.20 dS m⁻¹). This pattern is observed in the concentration of NO_3⁻ (M4: 870 mg L⁻¹; other treatments between 440-593 mg L⁻¹ in the first leaching) and in the Cl⁻ ion. A significant PO₄⁻³ content was detected in the last three drainages with values between 30 and 75 mg L⁻¹, not differences between treatments, associated with a high content of available P in the soil. The losses of NO_3⁻ in the soil are correlated with its initial content in the soil, (72-75 % of N leached in the first irrigation) associated with the dose, not the form of N application (mineral or organic). Likewise, the loss of available P in the soil is associated with its initial content. The results support the need to carry irrigation management with fertilization at agronomic doses, to avoid the loss of nutrients and the consequent risk of eutrophication.

Yagüe M.R., Betrán J.A., Bruna P., Lobo M.C. (en prensa). Evaluación de la lixiviación potencial de nutrientes en un suelo calcáreo fertilizado con gallinaza. ITEA‑Información Técnica Económica Agraria. Vol. xx: YY-YY. https://doi.org/10.12706/itea.2024.008