Structural quality of a no-tillage red latosol 50 months after gypsum aplication
| Autor: | Cássio Antonio Tormena, Leandro Michalovicz, Eduardo Fávero Caires, Marcelo Marques Lopes Müller, Luiz Fernando Machado Kramer, Aline Marques Genú |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Gypsum
Soil physics Soil Science Soil science Phosphogypsum engineering.material Latosol visual score Soil quality Bulk density lcsh:S1-972 Tillage soil physics Soil structure aggregation forces forças de agregação fosfogesso engineering Environmental science lcsh:Agriculture (General) phosphogypsum física do solo Agronomy and Crop Science escore visual |
| Zdroj: | Revista Brasileira de Ciência do Solo, Vol 36, Iss 3, Pp 1005-1014 (2012) Revista Brasileira de Ciência do Solo v.36 n.3 2012 Revista Brasileira de Ciência do Solo Sociedade Brasileira de Ciência do Solo (SBCS) instacron:SBCS |
| ISSN: | 1806-9657 |
| Popis: | Gypsum application may enhance the soil quality for plants in terms of soil chemical and physical properties. The objective of this study was to evaluate the effects of gypsum application on the structural quality of a no-tillage Red Latosol. The experiment was initiated in September 2005 in Guarapuava-PR, with gypsum applications of 0; 4; 8; and 12 Mg ha-1 on the soil surface. In November 2009, two soil blocks were sampled from the 0-0.3 m layer for visual evaluation of the soil structure quality (Sq) and to determine the aggregate-tensile strength (ATS). Soil penetration resistance (PR) and gravimetric moisture (H%) of the 0-0.300 m layer were evaluated, and soil cores were collected (layers 0.000-0.075 and 0.075-0.150 m), to determine soil bulk density (BD), total soil porosity (TP), microporosity (Mi), and macroporosity (Ma). Data were subjected to analysis of regression at 5 %. No significant effects of gypsum application on ATS and H % of aggregates were observed, but for Sq, a quadratic effect (0.000-0.075 m) and linear increase (0.075-0.150 and 0.150-0.300 m) were stated, indicating soil quality decrease, although Sq remained mostly below 3.0, with good to intermediate soil quality. Soil PR increased with gypsum, but also remained below critical levels. No effect was observed for soil H % at the moment of PR determination on the field. The gypsum applications decreased BD in the 0.075-0.150 m layer, and increased PT and Ma, while in 0.000-0.075 m some Ma was converted to Mi, without affecting PT and BD. These last results indicate a gain in soil structural quality by gypsum applications, but the higher scores of soil structure and values of soil penetration resistance, though still below thresholds, should be monitored to prevent limitations to soil use in the future. |
| Databáze: | OpenAIRE |
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