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Assessing Fertilizer Nitrogen Source...

Cornelio, Karla.

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Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems./
Author:	Cornelio, Karla.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	27 p.
Notes:	Source: Masters Abstracts International, Volume: 84-12.
Contained By:	Masters Abstracts International84-12.
Subject:	Agronomy. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30309864
ISBN:	9798379705411

Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems.
Cornelio, Karla.

Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 27 p.

Source: Masters Abstracts International, Volume: 84-12.

Thesis (M.S.)--University of California, Davis, 2023.

In California's water-seeded rice systems, both high yields and nitrogen (N) use efficiency are achieved when the pre-plant N fertilizer (usually aqueous-ammonia; aqua-N) is injected into a dry seedbed before flooding and planting. However, there are situations where applying N fertilizer in this manner is not possible. The objective of this study was to evaluate N management practices by testing different N sources and application times. Over two growing seasons (three site-years) we evaluated different N sources including aqua-N, granular urea, ammonium sulfate, and three enhanced efficiency nitrogen fertilizers (EENFs). Application times for the EENFs, urea, and ammonium sulfate were one day after flooding and 2 weeks after flooding. Urea and ammonium sulfate were also applied in a 4-way split (ratio of 20:30:30:20 applied every two weeks). In 2021, additional treatments were added with aqua-N, ammonium sulfate, and urea applied before flooding; and urea applications at 3, 4, and 5 weeks after flooding. Grain yield and agronomic nitrogen use efficiency (ANUE) were measured and used to make comparisons. All fertilizer N treatments increased grain yields and ANUE relative to the zero-N control. The EENF treatments performed similarly to or worse than urea applied alone. Splitting urea applications was the best option for applying N fertilizer after the field was flooded. Only one split N treatment was evaluated in this study; this warrants further research on fine-tuning the best N splits for these systems.

ISBN: 9798379705411Subjects--Topical Terms:

2122783
Agronomy.
Subjects--Index Terms:

Ammonium sulfate

Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems.
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245 1 0 $a Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 27 p.
500 $a Source: Masters Abstracts International, Volume: 84-12.
500 $a Advisor: Linquist, Bruce.
502 $a Thesis (M.S.)--University of California, Davis, 2023.
520 $a In California's water-seeded rice systems, both high yields and nitrogen (N) use efficiency are achieved when the pre-plant N fertilizer (usually aqueous-ammonia; aqua-N) is injected into a dry seedbed before flooding and planting. However, there are situations where applying N fertilizer in this manner is not possible. The objective of this study was to evaluate N management practices by testing different N sources and application times. Over two growing seasons (three site-years) we evaluated different N sources including aqua-N, granular urea, ammonium sulfate, and three enhanced efficiency nitrogen fertilizers (EENFs). Application times for the EENFs, urea, and ammonium sulfate were one day after flooding and 2 weeks after flooding. Urea and ammonium sulfate were also applied in a 4-way split (ratio of 20:30:30:20 applied every two weeks). In 2021, additional treatments were added with aqua-N, ammonium sulfate, and urea applied before flooding; and urea applications at 3, 4, and 5 weeks after flooding. Grain yield and agronomic nitrogen use efficiency (ANUE) were measured and used to make comparisons. All fertilizer N treatments increased grain yields and ANUE relative to the zero-N control. The EENF treatments performed similarly to or worse than urea applied alone. Splitting urea applications was the best option for applying N fertilizer after the field was flooded. Only one split N treatment was evaluated in this study; this warrants further research on fine-tuning the best N splits for these systems.
590 $a School code: 0029.
650 4 $a Agronomy. $3 2122783
650 4 $a Agriculture. $3 518588
650 4 $a Horticulture. $3 555447
653 $a Ammonium sulfate
653 $a California rice
653 $a Nitrogen fertilizer
653 $a Urea
653 $a Water-seeded rice
690 $a 0285
690 $a 0473
690 $a 0471
710 2 $a University of California, Davis. $b Horticulture and Agronomy. $3 1676792
773 0 $t Masters Abstracts International $g 84-12.
790 $a 0029
791 $a M.S.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30309864