TP6: Site management

In- and outputs of above-ground biomass in agroforestry systems, linking practice and science, analyses of micronutrients in soil


SP6 will concentrate on the in- and outputs of above-ground biomass at the core plots and will analyse the micronutrients (B, Mn, Cu, Zn and Fe) at all cropland sites. This will be a valuable addition to the ongoing research and will clarify whether the management as agroforest system has an influence on the micronutrient supply of arable crops. Research activities will be conducted in the silvoarable alley cropping system Dornburg and will use similar methods as the subprojects (SP) 5 (Wendhausen) and 7 (Forst). Furthermore, SP6 has the task of providing logistical support for research activities of other SIGNAL SPs on the Dornburg alley cropping system and reference area. In cooperation with SP 1-1 we implemented a no fertilization experiment in Dornburg. The examination of N-leaching in agroforestry system and on the reference area without N-fertilization will be done by SP 1-1. The tasks for us will be to supervise the no fertilization experiment, to support the land manager during fertilization and quantify the yield in the area with no fertilization. For this experiment we added eight more core plots. Four core plots on the reference area and four on the agroforestry system. The amount of aboveground biomass output from arable land is quantified during harvest. Yield estimation and mapping will be done with GPS-equipped harvesters. In addition, crop yield data and quality parameters are determined at 1, 4, 7, and 24 m distance from the tree strips within each core plot. The following parameters are tested: grain and straw yield (harvest-fresh, weighing), dry matter content grain and straw, grain: straw-ratio (calculation), thousand grains – and hectoliter-weight (only cereals). The following quality parameters will be analysed by SP5: protein and starch content (cereals), raw fat content and glucosinolate content (rapeseed). The amount of aboveground biomass input by crop harvest residues is determined at the above mentioned sampling locations. Each year during the dormancy period diameters at breast height (1.30 m) and heights of trees are measured to estimate the yearly growth rate. Leaf litter will be quantified by using leaf litter traps. To analyse the spatial distribution of tree litter, traps will be placed in the tree strips and along transects into the crop field (1, 4, 7, 24 m distance from the tree strips within the core plots, 8 replications). Quality parameters will be analysed by SP 5SP5. The amount of biomass output from SRC strips A-C was quantified during harvest in February 2019. The biomass weight of each tree strip was determined by weighing of absolute masses. Harvest of long rotation tree strips D to G is planned for 2022.



Torsten Graf

Thüringer Landesamt für Landwirtschaft und Ländlichen Raum (TLLLR)
Postbox 100 262, 07702 Jena, Germany

Phone: +49 (0)361 57 4047103

Carolin Rudolf

Thüringer Landesamt für Landwirtschaft und Ländlichen Raum (TLLLR)
Referat 34 | Landwirtschaftliches Versuchswesen und Nachwachsende Rohstoffe
Apoldaer Straße 4 | 07774 Dornburg-Camburg OT Dornburg

Phone: +49 (0) 361 57 40 47 106