Nitrogen management impact on winter wheat grain yield and estimated plant nitrogen loss
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Agronomy Journal
Abstract
Method of N application in winter wheat (Triticum aestivum L.) and its impact on
estimated plant N loss has not been extensively evaluated. The effects of the pre-plant
N application method, topdress N application method, and their interactions on grain
yield, grain protein concentration (GPC), nitrogen fertilizer recovery use efficiency
(NFUE), and gaseous N loss was investigated. The trials were set up in an incomplete
factorial within a randomized complete block design and replicated three times for 5
site-years. Data collection included normalized difference vegetation index (NDVI),
grain yield, and forage and grainNconcentration. TheNDVI before and after 90 growing
degree days (GDD) were correlated with final grain yield, grain N uptake, GPC,
and NFUE. At Efaw location, NDVI after 90 GDDs accounted for 58% of variation
in grain yield and 51% variation in grain N uptake. However, NDVI was found to be
a poor indicator of both GPC and NFUE. Grain yield was not affected by the method
and timing of N application at Efaw. Alternatively, at Perkins, topdress applications
resulted in higher yields. The GPC and NFUE were improved with the topdress applications.
Generally, topdress application enhanced GPC and NFUE without decreasing
the final grain yield. The difference method used in calculating gaseous N loss did not
always reveal similar results, and estimated plant N loss was variable by site-year, and
depended on daily fluctuations in the environment.
Description
Keywords
Nitrogen management, Winter wheat grain yield, Plant nitrogen loss
Citation
Dhillon, J., Eickhoff, E., Aula, L., Omara, P., Weymeyer, G., Nambi, E., ... & Raun, W. (2020). Nitrogen management impact on winter wheat grain yield and estimated plant nitrogen loss. Agronomy Journal, 112(1), 564-577. DOI: 10.1002/agj2.20107