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| Szerencsits, Manfred; Erhart, Eva. |
| Cover or catch crops have beneficial effects for soil, water, erosion, etc. If harvested, they also provide feedstock for biogas without competition for arable land. The latter also applies to clover grass ley or other residues on organic farms without ruminants and for manure. With an explorative approach, combining field experiments and data collection of practical implementation, we investigated achievable yields and identified recommendations for practical use. Gross energy yields of cover crops varied between 700 and 2000 m³ methane (CH4) ha-1 in Austria. The energy return on energy invested (EROI) ranges from 4 to 7, if biogas is upgraded and com¬pressed for biofuel use. Therefore, about 1000 m³ CH4 ha-1 are remaining as net energy yield from 4.5 t... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management Crop husbandry Soil Environmental aspects. |
| Ano: 2015 |
URL: http://orgprints.org/27238/1/27238_szerencsits.pdf |
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| Erhart, Eva; Hartl, Wilfried; Bartl, Barbara; Putz, Berta; Horak, Othmar. |
| The accumulation of heavy metals in soils is a potential risk that may keep organic farmers from using biowaste compost. As the ecological effects of metals are related to mobile fractions rather than to total contents in the soil, we measured the total (aqua regia extractable) heavy metal contents, the readily available water soluble and the potentially bioavailable LiCl-extractable fraction of soil heavy metals in a field experiment after ten years with total applications of 95, 175 and 255 t ha-1 biowaste compost (fresh matter). Total soil contents of Cd, Cr, Cu, Ni and Pb in the compost treatments were not significantly higher than in the unfertilized control. Total Zn contents increased in the treatment with the highest application rate. In... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Composting and manuring. |
| Ano: 2009 |
URL: http://orgprints.org/14479/1/Erhart_14479.pdf |
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| Erhart, Eva; Siegl, Thomas; Bonell, Marion; Unterfrauner, Hans; Peticzka, Robert; Ableidinger, Christoph; Haas, Dieter; Hartl, Wilfried. |
| Using biomass from intercrops as feedstock for biogas production makes it possible to produce renewable energy without compromising food production. In order that using intercrops for biogas and fertilizing with liquid digestate is sustainable, it must be secured that this practice does not have adverse effects on soil fertility. Two-year randomised field experiments were conducted on two different soil types near Bruck/Leitha (A). On chernozem soil, soil pH and composition of the cation exchange complex were hardly influenced by liquid digestate. Also on a parachernozem with pH 5.9 short-term effects of liquid digestate were small due to the low salt content and high C/N ratio of the digestate. Nevertheless the distinct increase in soil K content shows... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Crop combinations and interactions; Composting and manuring. |
| Ano: 2013 |
URL: http://orgprints.org/21521/1/21521_erhart.pdf |
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