Crop Residue Management Strategies to Reduce Nitrogen Losses during the Winter Leaching Period after Autumn Spinach Harvest

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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
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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
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
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Type of publication: Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Appears in Collections:FB01 - Hochschulschriften

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