Aplicación directa de residuos de almazaras de dos fases en un olivar con riego localizadoEfectos en las propiedades edáficas y el cultivo

  1. Barreto Da Silva, C.
Supervised by:
  1. Antonio López Piñeiro Director
  2. José Manuel Rato Nunes Director

Defence university: Universidad de Extremadura

Fecha de defensa: 03 September 2009

Committee:
  1. Arturo García Navarro Chair
  2. José Álvarez Rogel Secretary
  3. Fernanda Miranda Cabral Committee member
  4. María Henar Prieto Losada Committee member
  5. Pedro Vasconcelos Jordao Committee member

Type: Thesis

Teseo: 279305 DIALNET

Abstract

ABSTRACT Recent olive oil extraction technology (the two-phase centrifugation system) generates immense volumes of a hazardous waste with no economic interest. Nevertheless, this waste has a high content of organic matter and plant nutrients, so that it could be beneficial if were returned to Mediterranean soils exposed to the risk of degradation processes. We therefore investigated the effect of the surface application of two-phase olive mill waste (TPOMW) and de-oiled two-phase olive mill waste (DTPOMW), ranging from 0 to 40 Mg ha-1, on two representative Mediterranean agricultural soils, a Chromic Luvisol and a degraded Leptic Cambisol (LUC and CAL, respectively), in a 2-year greenhouse study using wheat (Triticum aestivum L.). In addition, we conducted a field study of an irrigated olive soil (CAL) subjected to five years' application of 30 and 60 Mg ha-1 of TPOMW and 27 and 54 Mg ha-1 of DTPOMW. We evaluated the effect of these applications on the soil and plant properties. The results showed significant increments (p> 0.05) of the soils' total organic carbon, water-soluble organic carbon, humic and fulvic acids, total nitrogen, available potassium, and cation exchange capacity, but the available phosphorus content declined significantly in the greenhouse study. The treatments significantly increased the wheat's yield and N, P, and K uptake in the CAL soil, but decreased its P and K uptake in the LUC soil. Analyses of the olive leaves showed significant increases in N, P, and K uptake two years after initiation of the treatment. There was also increased olive yield, especially with the lower application rates. These results show that direct TPOMW and DTPOMW application to land has the potential of being a major organic amendment to soil as a source of organic matter, N, and K, especially for degraded agricultural soils.