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

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems./
作者:	Cornelio, Karla.
面頁冊數:	1 online resource (27 pages)
附註:	Source: Masters Abstracts International, Volume: 84-12.
Contained By:	Masters Abstracts International84-12.
標題:	Horticulture. -
電子資源:	click for full text (PQDT)
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. - 1 online resource (27 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379705411Subjects--Topical Terms:

1058420
Horticulture.
Subjects--Index Terms:

Ammonium sulfateIndex Terms--Genre/Form:

554714
Electronic books.

Assessing Fertilizer Nitrogen Sources and Application Timing for Water-Seeded Rice Systems.
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502 $a Thesis (M.S.)--University of California, Davis, 2023.
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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.
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653 $a Urea
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