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      <src>https://socictopen.socict.org/files/original/225e277ea49f75bb44fb93a2ee188229.pdf</src>
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            <name>Title</name>
            <description>A name given to the resource</description>
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                <text>Agricultura sostenible</text>
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            <description>An account of the resource</description>
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                <text>Dominio científico: Agricultura sostenible</text>
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    <description>A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.</description>
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          <name>Title</name>
          <description>A name given to the resource</description>
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              <text>Soil Quality Assessment after 25 Years of Sewage Sludge vs. Mineral Fertilization in a Calcareous Soil</text>
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          <name>Creator</name>
          <description>An entity primarily responsible for making the resource</description>
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              <text>Luis Orcaray, Alberto Enrique, Iñigo Virto, Ana Simoes-Mota, Rosa Maria Poch</text>
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          <name>Description</name>
          <description>An account of the resource</description>
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              <text>The aim of this work was to identify the most sensitive soil quality indicators and assess soil quality after long-term application of sewage sludge (SS) and conventional mineral fertilization for rainfed cereal production in a sub-humid Mediterranean calcareous soil. The treatments included six combinations of SS at different doses (40 t ha−1 and 80 ha−1) and frequencies (every 1, 2 and 4 years), plus a control with mineral fertilization, and a baseline control without fertilization. Twenty-five years after the onset of the experiment, 37 pre-selected physical, chemical and biological soil parameters were measured, and a minimum data set was determined. Among these indicators, those significantly affected by treatment and depth were selected as sensitive. A principal component analysis (PCA) was then performed for each studied depth. At 0–15 cm, PCA identified three factors (F1, F2 and F3), and at 15–30 cm, two factors (F4 and F5) that explained 71.5% and 67.4% of the variation, respectively, in the soil parameters. The most sensitive indicators (those with the highest correlation within each factor) were related to nutrients (P and N), organic matter, and trace metals (F1 and F4), microporosity (F2), earthworm activity (F3), and exchangeable cations (F5). Only F3 correlated significantly (and negatively) with yield. From these results, we concluded that soil quality can be affected in opposite directions by SS application, and that a holistic approach is needed to better assess soil functioning under SS fertilization in this type of agrosystem.</text>
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          <name>Date</name>
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              <text>2021</text>
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          <name>Subject</name>
          <description>The topic of the resource</description>
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              <text>Mediterranean soils, long-term effect, sewage sludge, soil quality assessment</text>
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          <name>Identifier</name>
          <description>An unambiguous reference to the resource within a given context</description>
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            <elementText elementTextId="229934">
              <text>10.3390/land10070727</text>
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          <name>Source</name>
          <description>A related resource from which the described resource is derived</description>
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              <text>Land</text>
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          <name>Publisher</name>
          <description>An entity responsible for making the resource available</description>
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              <text>MDPI AG</text>
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          <name>Coverage</name>
          <description>The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant</description>
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              <text>Agriculture</text>
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          <name>Relation</name>
          <description>A related resource</description>
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              <text>&lt;a href="https://www.mdpi.com/2073-445X/10/7/727" target="_blank" rel="noreferrer noopener"&gt;https://www.mdpi.com/2073-445X/10/7/727&lt;/a&gt;</text>
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