BonaRes SIGNAL, Site: Dornburg, plant nitrogen (N) availability, N response efficiency and plant N uptake

This data was collected in cropland agroforestry (=alley cropping of poplar clone max 1 with summer barley) at Dornburg/Germany during 2016. Data was taken at 4 replicates each in the tree strip component of agroforestry (=T), the cropland of component of agroforestry at differnt distances from the tree stip (=1m, 4m, 7m) and at the conventional cropland (=Conv). Components of agroforestry were also weighted accoring to their field size representation (AF_weight, assigning AF, 1m, 4m and 7m with the weight of 6/15, 3/15, 3/15 and 3/15 respectively). We measured plant-available nitrogen (Nav) with the buried bag method (Page at al. 1994 Methods of soil analysis), nutrient response efficiency (NRE) as productivity devided by plant-available nitrogen (Bridgham et al. 1995 American Naturalist; productivity data provided by Rudolf et al. unpublished data, see file 3bed3f6a-c3a9-470e-9878-58521f7d736c). Plant N uptake (PlUp) was calculated as productivity x plant N concentrations (ICP).