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Effects of drainage intensity on water and nitrogen use efficiency and rice grain yield in a semi-arid marshland in Rwanda

Tuyishime, Olive and Joel, Abraham and Messing, Ingmar and Naramabuye, Francois and Sankaranarayanan, Muthiah and Wesström, Ingrid (2020). Effects of drainage intensity on water and nitrogen use efficiency and rice grain yield in a semi-arid marshland in Rwanda. Acta Agriculturae Scandinavica, Section B - Soil and Plant Science. 70 , 578-593
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Abstract

Drainage management is important in intensification of irrigated paddy rice production. This study assessed the effects of drainage intensity on water and nitrogen use efficiency and rice grain yield in a field experiment conducted during three seasons in Rwanda. The experiment comprised 12 plots with four blocks and three treatments: DS0.6(0.6 m deep drain), DD1(1.2)(1.2 m deep drain, control structure open four times per week), and DD2(1.2)(1.2 m deep drain, control structure open two times per week). Outflow was calculated from water balance. Nitrogen (N) content in drainage water was determined weekly. Crop yield and N uptake were determined in grain and straw. In all seasons, grain yield was 61-131% higher, crop N uptake was 24-90% higher, harvest index (HI) was 24-65% higher and water use efficiency (WUE) was 50-150% higher in treatments DD1(1.2)and DD2(1.2)than in DS0.6. There was a decrease in soil carbon/nitrogen ratio at the end of Seasons 2 and 3. Recirculating straw to fields is thus necessary to replenish SOC for long-term soil fertility. A practical implication of the study is that managed deep drainage systems could enhance water use efficiency and rice grain yield in poorly drained paddy fields.

Authors/Creators:Tuyishime, Olive and Joel, Abraham and Messing, Ingmar and Naramabuye, Francois and Sankaranarayanan, Muthiah and Wesström, Ingrid
Title:Effects of drainage intensity on water and nitrogen use efficiency and rice grain yield in a semi-arid marshland in Rwanda
Year of publishing :2020
Volume:70
Page range:578-593
Number of Pages:16
ISSN:0906-4710
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Surface drainage, paddy rice, nutrient losses, rice yield, harvest index
URN:NBN:urn:nbn:se:slu:epsilon-p-107779
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107779
Additional ID:
Type of IDID
DOI10.1080/09064710.2020.1817539
Web of Science (WoS)000569196700001
ID Code:17798
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:14 Oct 2020 06:42
Metadata Last Modified:14 Oct 2020 06:51

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