Nitrogen use efficiency of organically fertilized white cabbage and residual effects on subsequent beetroot

verfasst von

Kai Uwe Katroschan, Ralf Uptmoor, Hartmut Stützel

Abstract

Background and aims: The low N availability in organic cropping systems requires an efficient use of the limited N sources. The study aimed to analyze the N efficiency of organically fertilized white cabbage on a crop and crop rotation basis. Methods: Effects of soil-incorporated lupine seedlings and seed meal on the N use efficiency (NUE) and individual NUE components of cabbage were investigated in field experiments. Cabbage was followed by beetroot to quantify residual fertilizer effects. Results: Generally, NUE decreased with increasing N availability. Nitrogen uptake efficiency, however, was low at low N supply and increased curvilinearly to an asymptotic maximum. Variation in harvest index between and within experimental years was explained by differences in thermal growing time and initial cabbage growth, respectively. The increase in beetroot N supply by fertilizer treatments averaged 18 % of applied lupine seed N corresponding to 63 % of the incremental N in cabbage residues. Conclusions: Dry matter partitioning alters during cabbage yield formation in favor of the harvest residue fraction if abiotic stress like water shortage occurs directly after crop establishment, being associated with reduced NUE. The residual effect depends largely on the re-utilization of incremental fertilizer N in cabbage residues and thus on the short-term net N mineralization of organic fertilizers.

Organisationseinheit(en)

Institut für Gartenbauliche Produktionssysteme

Externe Organisation(en)

Landesforschungsanstalt für Landwirtschaft und Fischerei Mecklenburg-Vorpommern (LFA)
Universität Rostock

Typ

Artikel

Journal

Plant and soil

Band

382

Seiten

237-251

Anzahl der Seiten

15

ISSN

0032-079X

Publikationsdatum

29.05.2014

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Bodenkunde, Pflanzenkunde

Ziele für nachhaltige Entwicklung

SDG 2 – Kein Hunger

Elektronische Version(en)

https://doi.org/10.1007/s11104-014-2133-6 (Zugang: Geschlossen)