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Characterizing the Nitrogen Benefit of Alfalfa in California.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Characterizing the Nitrogen Benefit of Alfalfa in California./
Author:	Lin, Eric Fleming.
Description:	1 online resource (88 pages)
Notes:	Source: Masters Abstracts International, Volume: 57-01.
Contained By:	Masters Abstracts International57-01(E).
Subject:	Agronomy. -
Online resource:	click for full text (PQDT)
ISBN:	9780355451771

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

Characterizing the Nitrogen Benefit of Alfalfa in California. - 1 online resource (88 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355451771Subjects--Topical Terms:

1027735
Agronomy.
Index Terms--Genre/Form:

554714
Electronic books.

Characterizing the Nitrogen Benefit of Alfalfa in California.
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245 1 0 $a Characterizing the Nitrogen Benefit of Alfalfa in California.
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500 $a Source: Masters Abstracts International, Volume: 57-01.
500 $a Adviser: Daniel H. Putnam.
502 $a Thesis (M.S.)--University of California, Davis, 2017.
504 $a Includes bibliographical references
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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650 4 $a Agriculture. $3 660421
650 4 $a Plant sciences. $3 1179743
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