Nitrogen uptake and utilization of two maize hybrids with contrasting nitrogen use efficiencies depending on fertilization amount

verfasst von

Guodong Shao, Hao Cheng, Hongcui Dai, Hui Zhang, Juanjuan Ai, Kaichang Liu, Zongxin Li, Kazem Zamanian, Xin Qian

Abstract

Splitting nitrogen (N) application is beneficial for achieving higher grain yields and N use efficiency (NUE), but the responses of N utilization efficiency of different maize cultivars to top-dressing N fertilizer rates are still unclear. This study investigated the effects of fertilization managements on N uptake and utilization derived from topdressing fertilizers of maize hybrids (Ludan981 and Denghai605) with contrasting NUEs. The N fate derived from topdressing fertilizer was determined using the ¹⁵N tracing method. Grain yields, dry matter and N accumulation of both maize hybrids were significantly increased under low N levels but decreased under high N levels. Under N-deficient and excess conditions, Denghai605 had higher NUE than Ludan981. The N rates of topdressing significantly affected N uptake and utilization, but no difference was detected between two maize hybrids, and excessive N use led to higher rates of N loss and residual in soil. The N metabolism enzyme activities did not differ between the two maize hybrids. Our findings suggest optimized N management strategies by adjusting topdressing N application rate and timing are necessary to increase NUE and to minimize environmental costs in maize cropping system.

Organisationseinheit(en)

Institut für Bodenkunde

Externe Organisation(en)

Shandong Academy of Agricultural Sciences
National Engineering Laboratory for Wheat and Maize
Eberhard Karls Universität Tübingen
Nanjing University of Information Science and Technology

Typ

Artikel

Journal

Archives of Agronomy and Soil Science

Band

69

Seiten

2202-2217

Anzahl der Seiten

16

ISSN

0365-0340

Publikationsdatum

2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Agronomie und Nutzpflanzenwissenschaften, Bodenkunde

Ziele für nachhaltige Entwicklung

SDG 2 – Kein Hunger

Elektronische Version(en)

https://doi.org/10.1080/03650340.2022.2142573 (Zugang: Geschlossen)