Campus Units

Agronomy

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2020

Journal or Book Title

Agronomy Journal

DOI

10.1002/agj2.20495

Abstract

Spring‐seeded annual forages are well adapted to the Great Plains; however, the influence of application rate and method of nitrogen (N) fertilization on winter wheat (WW) (Triticum aestivum L.) forage productivity is unknown. A field study was conducted in a factorial design for three years to determine the influence of N application rate and method on water and N productivity of awnletted WW ‘Willow Creek’. Urea was either broadcast or banded at planting using N fertilization rates of 0, 28, 56, and 84 kg N ha−1. The N application rate × method interaction was significant only for WW height. Weed herbage was low at WW forage harvest, 19 kg ha−1. As N fertilization rate increased from 0 to 84 kg N ha−1, wheat stem density and height increased by 70 and 78%, respectively, and herbage increased by 58%. Increased N rate increased WW water use quadratically, but water productivity (kg biomass ha−1 mm−1) was 68% greater at 84 kg N ha−1. However, N application method did not influence water use or productivity. Banded N application increased N accumulation in WW herbage by 11% compared to broadcast N. Increasing N rate reduced N productivity by 24% compared to 0 kg N ha−1. Willow Creek WW produced greater herbage yield as N fertilization rate increased with banded application. Willow Creek is a highly productive fall‐planted forage in this predominantly spring‐planted small grain‐grain legume region.

Comments

This is a manuscript of an article published as Lenssen, Andrew W., Upendra M. Sainju, Clain Jones, Kent McVay, and Terry Angvick. "Nitrogen fertilization rate and method influences water and nitrogen productivity of forage winter wheat." Agronomy Journal (2020). doi: 10.1002/agj2.20495.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

Published Version

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