Title:	Crop Residue Management Strategies to Reduce Nitrogen Losses during the Winter Leaching Period after Autumn Spinach Harvest
Other Titles:	Ernterückstandsmanagement nach Herbstspinat zur Minderung von Stickstoffverlusten über die Sickerwasserperiode im Winter
Authors:	Frerichs, Christian Glied-Olsen, Stephan De Neve, Stefaan Broll, Gabriele Daum, Diemo
ORCID of the author:	https://orcid.org/0000-0001-8452-4319 https://orcid.org/0000-0002-7557-8355 https://orcid.org/0000-0003-4828-8309
Abstract:	In open-field vegetable production, high quantities of soil mineral nitrogen (Nmin) and N-rich crop residues often remain in the field at harvest. After the harvest of crops in autumn, this N can lead to considerable nitrate (NO3-) losses during the subsequent winter leaching period. In four field trials, different tillage depths (3–4, 10, 30 cm) and dates (early autumn, late autumn, early spring) were investigated to reduce N losses after growing spinach in the autumn. In a further treatment, the nitrification inhibitor 3,4-Dimethylpyrazole phosphate (DMPP) was directly applied to the crop residues. Potential N losses were calculated by a balance sheet approach based on Nmin concentration (0–90 cm), measured N mineralization and N uptake by catch crops. By postponing the tillage date from early to late autumn or spring, resprouting spinach stubbles acted as a catch crop, reducing N losses by up to 61 kg ha-1. However, if the spinach biomass collapsed, the N losses increased by up to 33 kg ha-1 even without tillage. The application of DMPP as well as the tillage depth were less effective. Overall, postponing tillage to spring seems to be the most promising approach for reducing N losses during the off-season.
Citations:	Agronomy, 12, 653, MDPI, 2022,1-20
URL:	https://doi.org/10.48693/76 https://osnadocs.ub.uni-osnabrueck.de/handle/ds-202203166447
Subject Keywords:	Spinacia oleracea L.; Nmin residue; Balance sheet; Nitrate leaching; Tillage depth; Tillage date; Nitrification inhibitor; 3,4-Dimethylpyrazole phosphate
Issue Date:	8-Mar-2022
License name:	Attribution 3.0 Germany
License url:	http://creativecommons.org/licenses/by/3.0/de/
Type of publication:	Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Appears in Collections:	FB01 - Hochschulschriften Open-Access-Publikationsfonds

This item is licensed under a Creative Commons License