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Zeitschriftenbeitrag (peer-reviewed)

2020

Hartung, C.; Andrade, D.; Dandikas, V.; Eickenscheidt, T.; Drösler, M.; Zollfrank, C.; Heuwinkel, H. (2020): Suitability of paludiculture biomass as biogas substrate biogas yield and long-term effects on anaerobic digestion. Renewable Energy (159), S.64-71.
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2014

Dandikas, V.; Heuwinkel, H.; Lichti, F.; Drewes, J.; Koch, K. (2014): Correlation between biogas yield and chemical composition of energy crops. Bioresource Technology 174, S.316-320.
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Rath, J.; Heuwinkel, H.; Taube, F.; Herrmann, A. (2014): Predicting specific biogas yield of maize-validation of different model approaches. BioEnergy Research, published online 5th Dec 2014.
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Polag, D.; Krapf, L.; Heuwinkel, H.; Laukenmann, S.; Lelieveld, J.; Keppler, F. (2014): Stable carbon isotopes of methane for real‐time process monitoring in anaerobic digesters. Engineering in Life Sciences 14 (2), S.153-160.
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2013

Polag, D.; Heuwinkel, H.; Laukenmann, S.; Greule, M.; Keppler, F. (2013): Evidence of anaerobic syntrophic acetate oxidation in biogas batch reactors by analysis of 13C carbon isotopes. Isotopes in Environmental and Health Studies 49 (3), S.365-377.
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Rath, J.; Heuwinkel, H.; Herrmann, A. (2013): Specific Biogas Yield of Maize Can Be Predicted by the Interaction of Four Biochemical Constituents. BioEnergy Research 6 (3), S.939-952.
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Krapf, L.; Nast, D.; Gronauer, A.; Schmidhalter, U.; Heuwinkel, H. (2013): Transfer of a near infrared spectroscopy laboratory application to an online process analyser for in situ monitoring of anaerobic digestion. Bioresource Technology (129), S.39-50.
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2012

Krapf, L.; Gronauer, A.; Schmidhalter, U.; Heuwinkel, H. (2012): Evaluation of agricultural feedstock-robust near infrared calibrations for the estimation of process parameters in anaerobic digestion. Journal of Near Infrared Spectroscopy 20 (4), S.465-476.
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2011

Krapf, L.; Gronauer, A.; Schmidhalter, U.; Heuwinkel, H. (2011): Near infrared spectroscopy calibrations for the estimation of process parameters of anaerobic digestion of energy crops and livestock residues. Journal of Near Infrared Spectroscopy 19 (6), S.479-493.
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Khalil, M.; Schmidhalter, U.; Gutser, R.; Heuwinkel, H. (2011): Comparative efficacy of urea fertilization via supergranules versus prills on nitrogen distribution, yield response and nitrogen use efficiency of spring wheat. Journal of Plant Nutrition 34 (6), S.779-797.
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2010

Laukenmann, S.; Polag, D.; Heuwinkel, H.; Greule, M.; Gronauer, A.; Lelieveld, J.; Keppler, F. (2010): Identification of methanogenic pathways in anaerobic digesters using stable carbon isotopes. Engineering in Life Sciences 10 (6), S.509-514.
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2006

Stadler, C.; von Tucher, S.; Schmidhalter, U.; Gutser, R.; Heuwinkel, H. (2006): Nitrogen release from plant-derived and industrially processed organic fertilizers used in organic horticulture. Journal of Plant Nutrition and Soil Science 169 (4), S.549-556.
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2005

Locher, F.; Heuwinkel, H.; Gutser, R.; Schmidhalter, U. (2005): Development of Near Infrared Reflectance Spectroscopy Calibrations to Estimate Legume Content of Multispecies Legume–Grass Mixtures. Agronomy Journal 97 (1), S.11-17.
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Locher, F.; Heuwinkel, H.; Gutser, R.; Schmidhalter, U. (2005): The Legume Content in Multispecies Mixtures as Estimated with Near Infrared Reflectance Spectroscopy: Method Validation. Agronomy Journal 97 (1), S.18-25.
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1992

Heuwinkel, H.; Kirkby, E.; Le Bot, J.; Marschner, H. (1992): Phosphorus deficiency enhances molybdenum uptake by tomato plants. Journal of Plant Nutrition 15 (5), S.549-568.
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Water culture experiments are described which provide conclusive evidence that Mo uptake by tomato plants is markedly enhanced by P deficiency. In a longterm experiment, which ran for 11 days, in marked contrast to the uptake of other nutrients, a three fold higher Mo uptake rate was observed after only four days of withdrawal of P from the nutrient medium. In contrast to the gradual increase in pH of the nutrient medium of the plants supplied with P, the pH in the medium of the ‐P plants fell. Throughout the growth of these plants net H+ efflux could be accounted for by excess cation over anion uptake, indicating that organic acid extrusion plays no major role in the observed fall in pH.

Further evidence that Mo uptake is enhanced in P deficient tomato plants is provided in short‐term nutrient solution experiments (1h and 4h) using radioactive molybdenum (99Mo). Compared with P sufficient plants, the uptake rates of 99Mo by P deficient plants were three to five times higher after 1h and nine to twelve times higher after 4h. Resupplying P during the uptake periods to deficient plants reduced the uptake rate of 99Mo to values similar to those of P sufficient plants. It is concluded that the uptake of molybdate occurs via phosphate binding/ transporting sites at the plasma membrane of root cells. Further support for this conclusion comes from exchange experiments with non‐labelled molybdenum, which show a much larger amount of 99Mo exchangeable from the roots of P deficient plants.


Zeitschriftenbeiträge

2013

Krapf, L.; Heuwinkel, H.; Schmidhalter, U.; Gronauer, A. (2013): The potential for online monitoring of short-term process dynamics in anaerobic digestion using near-infrared spectroscopy. Biomass and Bioenergy (48), S.224-230.
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2010

Keppler, F.; Laukenmann, S.; Rinne, J.; Heuwinkel, H.; Greule, M.; Whiticar, M.; Lelieveld, J. (2010): Measurements of 13C/12C Methane from Anaerobic Digesters: Comparison of Optical Spectrometry with Continuous-Flow Isotope Ratio Mass Spectrometry. Environmental Science & Technology 44 (13), S.5067-5073.
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2008

Lebuhn, M.; Heuwinkel, H.; Gronauer, A. (2008): Biogas production from mono-digestion of maize silage – long-term process stability and requirements. Water Science & Technology 58 (8), S.1645-1651.
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Beiträge in Monografien, Sammelwerken und Schriftenreihen

2001

Heuwinkel, H.; Gutser, R.; Claassen, N.; Schmidhalter, U. (2001): N2-fixation estimated by 15N natural abundance can be erroneous because of changes in 15N-discrimination during N-uptake. Plant Nutrition: Food security and sustainability of agro-ecosystems through basic and applied research, S.654-655.
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Determining 15N discrimination(∈) during N2 fixation is a must for the use of 15N natural abundance (NA) to estimate N2 fixation, while ∈ during uptake of mineral N is neglected because of low supply of N the in the field. In the greenhouse a nutrient-solution experiment was run to measure ∈ during sole NO3 nutrition (8 mM) of white lupin (lupNO3), oat and flax. Additionally ∈ was determined for white lupin solely supplied with N2-N (lupN2). Effects of plant age and N distribution within the plant were investigated by sequential harvests and separating the plants into their parts. Besides of strong growth of all plants only lupin reached the reproductive stage. More than double the N acquired by lupNO3 and lupN2 was taken up by oat. Mean ∈P/S [∈ 15N ‰] increased from flax (−3.9) via lupNO3 (−3.1) and oat (−2.4) to lupN2 (−1.5). In oat and flax ∈ oscillated around its mean, no change in lupN2 and showed a steady increase in lupNO3. A close relationship between ∈ and the shoot share to total N gain was found for all treatments. Therefore, N demand from the shoot determined ∈. The impact of these findings for field use of NA is discussed.


Sonstige Veröffentlichungen

2016

Drösler, M.; Eickenscheidt, T.; Bodmer, U.; Heuwinkel, H.; Meinken, E.; Moning, C.; Bockermann, C.; Hartung, C.; Then, M. (2016): Paludikulturen für Niedermoorböden in Bayern – Etablierung, Klimarelevanz & Umwelteffekte, Verwertungsmöglichkeiten und Wirtschaftlichkeit (MOORuse). Forschungsbericht der Hochschule Weihenstephan-Triesdorf.


Vorträge

2009

Kreppold, J.; Ebertseder, T.; Schmidhalter, U.; Heuwinkel, H. (2009): N-Umsatz im Boden nach Applikation verschiedener N-Dünger im ökologischen Freilandgemüsebau. Vortrag auf dem 121. VDLUFA-Kongress, 15.-18. September 2009 in Karlsruhe.