Changes in organic matter and residual effect of amendment with two-phase olive-mill waste on degraded agricultural soils.

摘要: Agricultural soils from many parts of the Mediterranean region are very poor in organic matter and exposed to progressive degradation processes. Therefore, additions olive-mill waste a continuous two-phase system as an amendment can improve soil quality hence mitigate negative environmental agronomic limitations these soils. A field study under semiarid conditions was conducted evaluate changes after four consecutive annual watery husk (OMWH) de-oiled olive pomace (TPOP) on grove soil: cutanic Luvisol (CL). Treatments included control, OMWH (30 60 Mg ha− 1, DW equivalent), TPOP (27 54 Mg equivalent). Also, two-year greenhouse using wheat (Triticum aestivum L.) residual effects adding CL degraded Leptic Cambisol (LC). five rates ranging 0 40 Mg ha− 1. Significant increases total carbon (TOC), water soluble (WSOC), humic fulvic acids, aggregate stability were observed treated plots, highest humification index obtained when applied at lowest rate. The increase correlated positively highly significantly (P < 0.01) with acid WSOC contents. In greenhouse, significant TOC, carbohydrates, stability, N, available K, cation exchange capacity both However, P decreased significantly. There increased fertilization effect for best fits grain yield linear regression (R2 = 0.957 P < 0.01), quadratic LC (R2 = 0.960 P < 0.01).