Short-term effects of olive mill by-products on soil organic carbon, total N, C:N ratio and stratification ratios in a Mediterranean olive grove

摘要: Abstract Olive grove soils in semi-arid Mediterranean areas are very poor organic matter and exposed to progressive degradation processes. Therefore, additions of the olive mill by-products as amendments can improve soil quality hence mitigate negative environmental agronomic limitations these soils. A field study was conducted assess short-term effects two oil [olive leaves alperujo (a two-phase waste)] determine carbon (SOC), total nitrogen (TN), C:N ratio, their stratification across profile, an area under conditions. The experimental design consisted on three large plots each spanning a 100 m × 100 m covered with unirrigated trees Picual variety less than 30 years old conventional tillage (CT) province Jaen (southern Spain). One used control plot other were treated (CTa) (CTol), respectively. Soil properties assessed after applied. Supplying increased C N stocks. Thus, SOC stock 75.4 Mg ha−1 CT, 91.5 Mg ha−1 CTa 136.3 Mg ha−1 CTol; TN 12.1, 13.9 16.1 Mg ha−1 CTol, SOC, ratio surface horizon higher (viz. 18.5 g C kg−1, 1.4 g N kg−1 13.2:1 CTa, 84.1 g C kg−1, 5.7 g N kg−1 14.7:1 CTol) (8.9 g C kg−1, 0.9 g N kg−1 9.8:1, respectively). In addition, application improved (the SR, for greater 2). Oil such thus potentially useful since they effective sources nitrogen, alleviate agricultural soils, even those using CT. be recycled site.