AgroecoliveLab presents new NUTRIOLIVAR results on nutrient recycling (N, P, and K) in olive groves under different management regimes. The study compares the exported fraction—what leaves the farm with the harvest or removed residues—with the recycled fraction, which returns to the soil via leaves, shredded pruning residues, cover crops, and organic amendments. The data confirm that as management shifts toward more agroecological practices, the percentage of recycled N, P, and K increases and the exported fraction decreases.
Closing the cycle of these nutrients translates into less purchased fertilizer, cost savings, and lower emissions associated with fertilizer manufacturing and transport. In addition, recycling reactivates soil biology and improves soil structure and water-holding capacity, thereby increasing the resilience of olive groves.
The accompanying figure illustrates the increase in recycling when moving from conventional to agroecological systems.