This dataset contains agronomic measurement data of pure stands and mixed stands of 27 pea genotypes (P. sativum L.) and 8 barley genotypes (H. vulgare L.), sown in an incomplete factorial (Haug et al., 2021) at two locations in Switzerland over two years (2018 and 2019) under organic management. It contains 13'522 data points collected on 960 micro plots. total yield mixed stand/pure stand yield fraction yields of pea and barley in mixed stand land equivalent ratios (LERs) early vigor early canopy height (1st measurement) early canopy height (2nd measurement) canopy height at grain filling canopy height at maturity onset of pea flowering total biomass stipule length stipule size stipule area lodging at grain filling lodging at maturity The data set contains data used in the PhD thesis of Benedikt Haug (http://theses.fr/2021UPASB042). The data was acquired in the framework of the ReMIX project (https://www.remix-intercrops.eu/) which was funded by the European Union's Horizon 2020 research and innovation program, under grant agreement nr. 727217. Literature: Haug, B., Messmer, M. M., Enjalbert, J., Goldringer, I., Forst, E., Flutre, T., et al. (2021). Advances in Breeding for Mixed Cropping – Incomplete Factorials and the Producer/Associate Concept. Front. Plant Sci. 11. doi: 10.3389/fpls.2020.620400.