@article{nokey,

title = {Soil nitrogen and water management by winter-killed catch crops},

author = {D. Heuermann and N. Gentsch and G. Guggenberger and B. Reinhold-Hurek and D. Schweneker and U. Feuerstein and M. C. Heuermann and J. Gro\ss and R. K\"{u}mmerer and B. Bauer and N. von Wir\'{e}n },

editor = {European Geosciences Union},

url = {https://soil.copernicus.org/articles/8/269/2022/},

doi = {https://doi.org/10.5194/soil-8-269-2022},

year  = {2022},

date = {2022-01-01},

urldate = {2022-01-01},

journal = {SOIL},

volume = {8},

issue = {1},

pages = {269\textendash281},

abstract = {Improving N cycling in agroecosystems is one of the key challenges in reducing the environmental footprint of agriculture. Further, uncertainty in precipitation makes crop water management relevant in regions where it has not been necessary thus far. Here, we focus on the potential of winter-killed catch crops (CCs) to reduce N leaching losses from N mineralization over the winter and from soil water management. We compared four single CCs (white mustard, phacelia, Egyptian clover and bristle oat) and two CC mixtures with 4 and 12 plant species (Mix4 and Mix12) with a fallow treatment. High-resolution soil mineral N (Nmin) monitoring in combination with the modelling of spatiotemporal dynamics served to assess N cycling under winter-killed CCs, while soil water was continuously monitored in the rooting zone. Catch crops depleted the residual Nmin pools by between 40 % and 72 % compared to the fallow. The amount of residual N uptake was lowest for clover and not significantly different among the other CCs. Catch crops that produce high N litter materials, such as clover and mustard leaves, showed an early N mineralization flush immediately after their termination and the highest leaching losses from litter mineralization over the winter. Except for clover, all CCs showed Nmin values between 18 % and 92 % higher on the sowing date of the following maize crop. However, only Mix12 was statistically significant. Catch crops depleted the soil water storage in the rooting zone during their growth in autumn and early winter, but preserved water later on when their residues covered the ground. The shallow incorporation of CC residues increased water storage capacity during the cropping season of the main crop even under reduced soil water availability. Hence, catch cropping is not just a simple plant cover for the winter but improves the growth conditions for the following crop with decreased N losses. Mixtures have been shown to compensate for the weaknesses of individual CC species in terms of nutrient capture, mineralization and transfer to the following main crop as well as for soil water management. Detailed knowledge about plant performance during growth and litter mineralization patterns is necessary to make optimal use of their potential.},

keywords = {Ackerbau, Bodenbearbeitung, Catch crops},

pubstate = {published},

tppubtype = {article}

}

@article{BauerB.vonWirenN..2020,

title = {Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms},

author = {N. von Wir\'{e}n and B. Bauer },

editor = {Nature Publishing Group},

url = {https://www.nature.com/articles/s41598-020-77467-3},

doi = {https://doi.org/10.1038/s41598-020-77467-3},

year  = {2020},

date = {2020-11-25},

urldate = {2020-11-25},

journal = {Nature Scientific Reports},

volume = {10:20504},

abstract = {Cereal crop yield comprises interrelated components, among which the number of tillers is highly responsive to nitrogen fertilization. We addressed the hypothesis of whether the supply of different nitrogen forms can be employed to manipulate the tiller number in cereal crops. Relative to urea or ammonium, exclusive supply of nitrate increased tiller number in hydroponically-grown barley plants. Thereby, tiller number correlated positively with the root-to-shoot translocation rate of endogenous cytokinins. External supply of a synthetic cytokinin analog further stimulated tillering in nitrate-containing but not in urea-containing nutrient solution. When the cytokinin analog 6-benzylaminopurine riboside was externally supplied to roots, its translocation to shoots was 2.5 times higher in presence of nitrate than in presence of urea or ammonium, suggesting that cytokinin loading into the xylem is affected by different nitrogen forms. We then translated this finding to field scale, cultivated winter wheat in four environments, and confirmed that nitrate fertilization significantly increased tiller number in a dose-dependent manner. As assessed in 22 winter wheat cultivars, nitrogen form-dependent tiller formation was subject to substantial genotypic variation. We conclude that cytokinin-mediated signaling effects of fertilizer nitrogen forms can be employed as a management tool to regulate the tiller number in cereal crops.},

keywords = {Ackerbau, Bodenbearbeitung, D\"{u}ngung},

pubstate = {published},

tppubtype = {article}

}

@article{N.2019,

title = {Den Boden nur sehr flach bearbeiten},

author = {N. Bleisteiner and S. Hamberger and M. Heinz and T. Steigerwald and K. Seubert and B. Bauer and S. Bauer and P. O. Noack 

},

editor = {Landvolk Verlag},

year  = {2019},

date = {2019-12-21},

urldate = {2019-12-21},

journal = {Rheinische Bauernzeitung},

volume = {51/52},

keywords = {Ackerbau, Bodenbearbeitung},

pubstate = {published},

tppubtype = {article}

}

@article{Bauer.2019,

title = {Flach bearbeiten statt Glyphosat},

author = {N. Bleisteiner and S. Hamberger and S. Bauer and M. Heinz and T. Steigerwald and K. Seubert and P. O. Noack and B. Bauer },

year  = {2019},

date = {2019-01-01},

urldate = {2019-01-01},

journal = {Bayrisches Landwirtschaftliches Wochenblatt},

volume = {42},

keywords = {Ackerbau, Bodenbearbeitung},

pubstate = {published},

tppubtype = {article}

}