Nitrogen may be lost from the soil through the following processes except

Nitrogen may be lost from the soil through crop removal, soil erosion, and leaching, but not through irrigation. Crop removal occurs when plants absorb nitrogen from the soil and are harvested, taking the nitrogen with them. Soil erosion can lead to the loss of topsoil, which contains organic matter and nitrogen. Leaching occurs when excess water moves through the soil, carrying nitrogen with it and depositing it in groundwater or surface water. However, irrigation is the process of adding water to the soil, which does not remove or add nitrogen to the soil. Therefore, nitrogen is not lost from the soil through irrigation.