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BayWISS-Kolleg Life Sciences and Green Technologies www.baywiss.de

Research Projects Life Sciences and Green Technologies

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PhD Projects

Evaluation of secondary phosphates for the use as a new P fertiliser in ornamental plant production.

The global need for phosphorous fertilisers, that are needed to feed plants, is growing due to an increasing world population. At present, this need will be largely covered by mineral fertilisers, which are extracted from rock phosphate. Given that this is a finite resource, there is an urgent need to sustainably manage the remaining reserves.

Innovative P fertilisers from P-rich residual material flows (secondary phosphate), represent a possible alternative for products based on raw phosphate. Previous investigations mainly using agricultural crops in undisturbed ground, have shown that the P fertiliser effect of some secondary phosphates, which is dependent on the processing, can be classified as satisfactory. However, the transferability of results to ground-independent production in substrates, which may exhibit a highly diverse composition, is largely unknown. The reason for this is the specific cultivation conditions (chemical/physical properties of the growing medium, limited root area, short cultivation time) when compared to soil culture. Thus, one of the research project’s aims is to evaluate the effectiveness of P fertilisers based on residual material for the cultivation of ornamental plants in pots using peat substrates.

The first working steps comprise the identification and procurement of currently available P fertilisers on a residual material, as well as the selection of a suitable P-sensitive model plant. In the following plant experiments, the P fertiliser is examined under the influence of various factors (pH value, grain size, time). Assessing plant availability as part of plant cultivation tests is very time- and cost-intensive. On the other hand, the characterisations of fertilisers by determining their solubility in various extracting agents has so far represented a comparatively resource-friendly method for predicting the fertilising effect. The question is whether this will continue to apply to secondary phosphates. Another goal pursued by the research project is therefore to examine the extent to which modelling of the fertiliser effect is possible based on results from chemical fractionation



Supervisor Technische Universität München:
Hochschule für angewandte Wissenschaften Weihenstephan-Triesdorf:

Prof'in Dr. Elke Meinken

Research focuses:

  • Peat substitute
  • Fertiliser/soil additives
  • Fertilisation strategies
  • Anaylitics

Knowledge of plant nutrition and soil science rank among the elementary foundations for resource- and environmentally friendly production in all areas of horticulture. Peat substitute, innovative fertiliser and soil additives, optimised fertilisation strategies as well as developing methods for conclusive laboratory and on-site analytics have been focus of research for many years.



Dipl. Biol. Daniel Hauck

Daniel Hauck

Hochschule für angewandte Wissenschaften Weihenstephan-Triesdorf

Degree: Biology, TU Darmstadt


Get in touch. We look forward to your questions and ideas for our Joint Academic Partnership Life Sciences and Green Technologies

Dr. Ute Nazet

Dr. Ute Nazet

Koordinatorin BayWISS - Verbundkolleg Life Sciences und Grüne Technologien

Hochschule für angewandte Wissenschaften Weihenstephan-Triesdorf
Am Staudengarten 7 | Gebäude H7
85354 Freising

Telephone: +49 8161 714530