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Nitrogen Conservation With Cover Crops: Effect Of Cn Ratio And N Losses Over Winter On The Potential To Supply Succeeding Crops

Stumm, Christoph; Reinhard, Isabelle; Schmitt, Dominik; Kemper, Roman and Döring, Thomas (2021) Nitrogen Conservation With Cover Crops: Effect Of Cn Ratio And N Losses Over Winter On The Potential To Supply Succeeding Crops. Paper at: Organic World Congress 2021, Science Forum: 6th ISOFAR Conference co-organised with INRA, FiBL, Agroecology Europe, TP Organics and ITAB, Rennes, France, 8 - 10 September, 2021. [Completed]

[thumbnail of OWC2020-SCI-1431.pdf] PDF - English
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Summary

A field trial with different cover crops was carried out in 2018 in Hennef, Germany, to clarify the fate of plant nitrogen over winter. High amounts of nitrogen (up to 100 kg ha-1) were taken up by aboveground plant biomass before winter. Nitrate leaching was avoided in a large scale compared to the untreated control. After winter 10 to 55 % of shoot nitrogen were lost with the highest decline in legumes and the lowest in crucifers. If mulched, losses raised up to 90 %, e.g. for narrow-leaved lupin. Nitrogen losses were slightly lower, when mulch was incorporated by rotary tilling. The CN ratio in stems became wider after winter. Only in leaves the CN ratio was narrow enough to cause an effect on nitrogen supply to the succeeding crop. A trend to higher soil mineral N in spring was only noted in treatments with frost hardy cover crops.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:CN ratio, cover crops, nitrate leaching, nitrogen supply, succeeding crops
Subjects:"Organics" in general
Research affiliation: International Conferences > 2021: Organic World Congress, Science Forum: 6th ISOFAR Conference co-organised with INRA, FiBL, Agroecology Europe, TP Organics and ITAB > Product and process quality in Organic Agriculture: methods and challenge
Germany > Other organizations
Deposited By: rey, m. frederic
ID Code:42231
Deposited On:07 Sep 2021 13:12
Last Modified:26 Feb 2023 14:21
Document Language:English
Status:Unpublished
Refereed:Peer-reviewed and accepted
Additional Publishing Information:A book of abstracts of papers of the Science Forum at the Organic World Congress 2021, September 8-10, Online and on-site in Rennes, France '6th ISOFAR Conference co-organised with INRA, FiBL, Agroecology Europe, TP Organics and ITAB' has been published

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