Saturday, 15 July 2006
166-39

Organic Amendment Based on Wheat Straw: Influence on Soil Biological Properties.

Manuel Tejada1, José Luis Moreno2, Felipe Bastida2, Teresa Hernández2, and Carlos García2. (1) EUITA-Univ de Sevilla, Crta. de Utrera, km 1 41013-, Sevilla, Spain, (2) Centro de Edafología y Biología Aplicada del Segura. CEBAS-CSIC., Campus Universitario de Espinardo. P.O Box 164 30100-Espinardo, Murcia, Spain

We studied in the laboratory the effects of adding Wheat Straw Chopped (WSC) and No Chopped (WSNC) and with and without urea (150 kg N ha-1) (WSC+N and WSNC+N) on soil biochemical properties of a Typic Xerofluvent. Materials were transferred into the microcosms 24 h after application and triplicate treatments were incubated in darkness at 25 °C inside an incubation chamber for seven lengths of time (3, 7, 15, 30, 60, 90 and 120 days). Soil microbial biomass, and the activities of urease, dehydrogenase, protease-BBA, &beta-glucosidase, and alkaline phosphatase were measured in soils for each time of incubation. The results obtained indicate the importance of the application wheat straw chopped with N respect to the rest of fertilizer treatments studied. In this respect, and at the end of experimental period, soil microbial biomass increased 21% in WSC treatment respect to WSNC treatment, 24.2% in WSC+N treatment respect to WSC treatment, and 39% in WSNC+N treatment respect to WSNC treatment. As regards the soil enzymatic activities analyzed, the highest values at the end of experimental period were observed in WSC+N-amended soils, followed by WSNC+N-amended soils, WSC-amended soils and WSNC-amended soils.

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