The general objective of WP08 is validation of the agronomic effectiveness and the economic value of innovative bio-effector-based plant nutrition strategies developed within WP04-07. This requires field testing under the different geographical situations and crop management systems, representing the current practice in European agriculture. Plant performance, yield and product quality obtained within the novel fertilisation strategies will be compared with standard fertilization regimes in farmers practice. The international field testing network comprises field sites in Northern Ireland, Denmark, Central and South Germany, Switzerland, Czech Republic, Hungary, Romania, Southern Italy and Israel to cover the different climatic and geographical conditions in Europe. Although, the different characteristics, stress factors and agricultural practices in the different regions of Europe are considered, setup and evaluation of the field trials follows a standardised protocol to ensure comparability of the results for the final economic evaluation (link to WP09). Another important task of WP08 is the organisation of demonstration trials to promote implementation of the novel fertilisation strategies into agricultural practice.