This technical extension guide prepared by ICRAF and partner organizations explains practical methods for measuring soil erosion and nutrient loss on sloping agricultural land. The document highlights that soil erosion caused by water and wind is a major threat to food security and soil fertility worldwide. Sloping lands in mountainous regions are especially vulnerable due to steep terrain, heavy rainfall, and unsustainable farming practices. The guide introduces erosion plots surrounded by barriers and sediment traps as a simple and low-cost method to monitor soil loss. It explains how to design erosion plots, install barriers, and collect eroded soil and runoff. Soil samples are dried and weighed to calculate erosion rates in tons per hectare. The document also emphasizes the importance of measuring nutrient losses, including organic matter, nitrogen, phosphorus, and potassium, to improve soil conservation and sustainable agroforestry management under climate change conditions in Southeast Asia.
