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Characterizing the Nitrogen Benefit ...

Lin, Eric Fleming.

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Characterizing the Nitrogen Benefit of Alfalfa in California.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterizing the Nitrogen Benefit of Alfalfa in California./
Author:	Lin, Eric Fleming.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	88 p.
Notes:	Source: Masters Abstracts International, Volume: 57-01.
Contained By:	Masters Abstracts International57-01(E).
Subject:	Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10623729
ISBN:	9780355451771

Characterizing the Nitrogen Benefit of Alfalfa in California.
Lin, Eric Fleming.

Characterizing the Nitrogen Benefit of Alfalfa in California. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 88 p.

Source: Masters Abstracts International, Volume: 57-01.

Thesis (M.S.)--University of California, Davis, 2017.

Alfalfa in high-yielding environments fixes significant amounts of atmospheric N?, a portion of which benefits succeeding non-legume crops and reduces fertilizer N requirements by an amount sometimes termed the "legume N benefit." Field research-based estimates of the N benefit in California and other irrigated, semi-arid or arid environments are sparse, with most previous work having been conducted in predominantly rainfed, humid systems. Differences in crop management and growing environment between cropping systems could mean that nitrogen benefits in California and similar environments are different from nitrogen benefits in predominantly rainfed cropping systems. We conducted replicated plot experiments at three field station sites in California using wheat as an indicator crop to assess alfalfa's N contribution to a subsequent crop. The wheat was grown with N rates ranging from 0 to 280 kg N ha -1 after (1) continuous alfalfa ('Following Alfalfa') or (2) sudangrass-wheat ('Following Grains'). Plants were assessed for biomass production, nitrogen uptake, and grain protein content. A growth benefit was observed for plants in the 'Following Alfalfa' treatment for all growth metrics, and wheat in both rotation treatments took up the same amount of nitrogen when supplied with 280 kg N ha -1. Alfalfa's rotational N benefit likely accounted for most of its rotation benefit to wheat, and at one location this benefit was enough that N fertilization had no effect on aboveground biomass. Based on biomass production and nitrogen uptake data, we calculated a nitrogen benefit of between 102 and 114 kg N ha?¹ for wheat following a healthy alfalfa stand in an irrigated semi-arid environment.

ISBN: 9780355451771Subjects--Topical Terms:

2122783
Agronomy.

Characterizing the Nitrogen Benefit of Alfalfa in California.
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520 $a Alfalfa in high-yielding environments fixes significant amounts of atmospheric N?, a portion of which benefits succeeding non-legume crops and reduces fertilizer N requirements by an amount sometimes termed the "legume N benefit." Field research-based estimates of the N benefit in California and other irrigated, semi-arid or arid environments are sparse, with most previous work having been conducted in predominantly rainfed, humid systems. Differences in crop management and growing environment between cropping systems could mean that nitrogen benefits in California and similar environments are different from nitrogen benefits in predominantly rainfed cropping systems. We conducted replicated plot experiments at three field station sites in California using wheat as an indicator crop to assess alfalfa's N contribution to a subsequent crop. The wheat was grown with N rates ranging from 0 to 280 kg N ha -1 after (1) continuous alfalfa ('Following Alfalfa') or (2) sudangrass-wheat ('Following Grains'). Plants were assessed for biomass production, nitrogen uptake, and grain protein content. A growth benefit was observed for plants in the 'Following Alfalfa' treatment for all growth metrics, and wheat in both rotation treatments took up the same amount of nitrogen when supplied with 280 kg N ha -1. Alfalfa's rotational N benefit likely accounted for most of its rotation benefit to wheat, and at one location this benefit was enough that N fertilization had no effect on aboveground biomass. Based on biomass production and nitrogen uptake data, we calculated a nitrogen benefit of between 102 and 114 kg N ha?¹ for wheat following a healthy alfalfa stand in an irrigated semi-arid environment.
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