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| Hauptseite > Publikationsdatenbank > Energy crop (sida hermaphrodita) fertilization using digestate under marginal soil conditions: a dose-response experiment |
| Hauptseite > Publikationsdatenbank > Energy crop (sida hermaphrodita) fertilization using digestate under marginal soil conditions: a dose-response experiment |
| Abstract | FZJ-2014-01219 |
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2014
Abstract: Geophysical Research AbstractsVol. 16, EGU2014-14000, 2014EGU General Assembly 2014The global demand for energy security and the mitigation of climate change are the main drivers pushing energy-plant production in Germany. However, the cultivation of these plants can cause land use conflicts since agriculturalsoil is mostly used for plant production. A sustainable alternative to the conventional cultivation of food-basedenergy-crops is the cultivation of special adopted energy-plants on marginal lands. To further increase the sustain-ability of energy-plant cultivation systems the dependency on synthetic fertilizers needs to be reduced via closednutrient loops. In the presented study the energy-plant Sida hermaphrodita (Malvaceae) will be used to evaluatethe potential to grow this high potential energy-crop on a marginal sandy soil in combination with fertilization viadigestate from biogas production. With this dose-response experiment we will further identify an optimum dose,which will be compared to equivalent doses of NPK-fertilizer. Further, lethal doses and deficiency doses will beobserved. Two weeks old Sida seedlings were transplanted to 1L pots and fertilized with six doses of digestate(equivalent to a field application of 5, 10, 20, 40, 80, 160t/ha) and three equivalent doses of NPK-fertilizer. Controlplants were left untreated. Sida plants will grow for 45 days under greenhouse conditions. We hypothesize that thenutrient status of the marginal soil can be increased and maintained by defined digestate applications, compared tocontrol plants suffering of nutrient deficiency due to the low nutrient status in the marginal substrate. The dose of40t/ha is expected to give a maximum biomass yield without causing toxicity symptoms. Results shall be used asbasis for further experiments on the field scale in a field trial that was set up to investigate sustainable productionsystems for energy crop production under marginal soil conditions.
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