Organic Fertilization in Maize Cropping Systems: Measures to Reduce N Losses

by Hans-Werner Olfs
Published 2021-04-01

Evaluation of the Dynamic Tube Method for Measuring Ammonia Emissions after Liquid Manure Application

by Martin ten Huf, Hans-Werner Olfs
Published 2023-06-01

Development of a Physicochemical Test Kit for On-Farm Measurement of Nutrients in Liquid Organic Manures

by Max-Frederik Piepel, Hans-Werner Olfs
Published 2023-02-01

An Incubation System for the Simulation of Ammonia Emissions from Soil Surface-Applied Slurry: Effect of pH and Acid Type

by Nils Carsten Thomas Ellersiek, Hans-Werner Olfs
Published 2024-05-01

Evaluation of Physicochemical On-Farm Quick Tests for Estimating Nutrient Concentrations in Pig Slurry and Development of an Application for Mobile Devices

by Max-Frederik Piepel, Klaus Dittert, Hans-Werner Olfs
Published 2022-11-01

Effects of sample pre-treatments on the analysis of liquid organic manures by visible and near-infrared spectrometry

by Michael Horf, Robin Gebbers, Hans-Werner Olfs, Sebastian Vogel
Published 2024-03-01

Drivers for the Adoption of Different Eco-Innovation Types in the Fertilizer Sector: A Review

by Kathrin Hasler, Hans-Werner Olfs, Onno Omta, Stefanie Bröring
Published 2017-11-01

Optical Spectrometry to Determine Nutrient Concentrations and other Physicochemical Parameters in Liquid Organic Manures: A Review

by Michael Horf, Sebastian Vogel, Harm Drücker, Robin Gebbers, Hans-Werner Olfs
Published 2022-02-01

Eco-innovations in the German fertilizer supply chain: Impact on the carbon footprint of fertilizers

by Kathrin HASLER, Stefanie BRÖRING, Onno S.W.F. OMTA, Hans-Werner OLFS
Published 2017-12-01

Determination of Nutrients in Liquid Manures and Biogas Digestates by Portable Energy-Dispersive X-ray Fluorescence Spectrometry

by Michael Horf, Robin Gebbers, Sebastian Vogel, Markus Ostermann, Max-Frederik Piepel, Hans-Werner Olfs
Published 2021-06-01

Influence of Light Intensity and Spectrum on Duckweed Growth and Proteins in a Small-Scale, Re-Circulating Indoor Vertical Farm

by Finn Petersen, Johannes Demann, Dina Restemeyer, Hans-Werner Olfs, Heiner Westendarp, Klaus-Juergen Appenroth, Andreas Ulbrich
Published 2022-04-01

Influence of the Nitrate-N to Ammonium-N Ratio on Relative Growth Rate and Crude Protein Content in the Duckweeds <i>Lemna minor</i> and <i>Wolffiella hyalina</i>

by Finn Petersen, Johannes Demann, Dina Restemeyer, Andreas Ulbrich, Hans-Werner Olfs, Heiner Westendarp, Klaus-Jürgen Appenroth
Published 2021-08-01

Nutritional Value of Duckweed as Protein Feed for Broiler Chickens—Digestibility of Crude Protein, Amino Acids and Phosphorus

by Johannes Demann, Finn Petersen, Georg Dusel, Manuela Bog, Reindert Devlamynck, Andreas Ulbrich, Hans-Werner Olfs, Heiner Westendarp
Published 2022-12-01

Effects of Liquid Manure Application Techniques on Ammonia Emission and Winter Wheat Yield

by Martin ten Huf, Thorsten Reinsch, Mareike Zutz, Christoph Essich, Reiner Ruser, Caroline Buchen-Tschiskale, Heinz Flessa, Hans-Werner Olfs
Published 2023-02-01