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Urea deep placement in combination with Azolla for reducing nitrogen loss and improving fertilizer nitrogen recovery in rice field
Yao, Yuanlin1,2; Zhang, Min1,2; Tian, Yuhua1; Zhao, Miao3; Zhang, Bowen4; Zeng, Ke1,2; Zhao, Meng1,2; Yin, Bin1
2018-04-01
Source PublicationFIELD CROPS RESEARCH
ISSN0378-4290
Volume218Pages:141-149
SubtypeArticle
Contribution Rank4
AbstractReducing environmental harm and improving fertilizer use efficiency is critical in Chinese agriculture. Azolla has particular value for paddy rice crop due to its biological nitrogen (N) fixation ability; however, the Chinese rice fields are highly fertilized, which will depress the N fixation of Azolla. Urea deep placement (UDP) reduces floodwater NH4+ and ammonia volatilization losses. To date, few studies have explored the effects of UDP combined with Azolla on the N uptake pattern, N recovery and N loss from N-15-labeled urea. Therefore, a 3-year field experiment was conducted with five treatments (control without urea, (CK), urea broadcasting without Azolla (B) or with Azolla (BA), and UDP without Azolla (P) or with Azolla (PA)) in an intensive rice cropping system in the Taihu Region of China. The total N-15 recovery (soil-plant system), crop N-15 uptake (straw and grain) and N-15 loss were assessed, and the ammonia (NH3) loss, rice yield, gross return and net economic benefit were measured. The results showed that the UDP treatments had delayed but long-lasting fertilization effects. The PA treatment resulted in the lowest N-15 loss and highest total N-15 recovery at harvest due to the prolonged N availability and negligible NH3 loss. The PA, P and BA treatments decreased N-15 loss by 47%,33% and 18% and increased total N-15 recovery by 58%, 40% and 22%, respectively, compared to urea broadcasting alone. Almost all labeled Azolla-N was released within two months of which approximately 40% could be absorbed by the crop. Little labeled fertilizer N was absorbed by Azolla during the rice season. In addition, the PA, P and BA treatments increased rice yield and gross return by 13%, 10% and 9%, respectively, and they produced similar net economic benefit compared to urea broadcasting alone. In conclusion, UDP combined with Azolla is a potential strategy to further reduce fertilizer N loss and improve total fertilizer N recovery while maximizing rice yield if it can be widely adopted by Chinese rice farmers. However, widespread adoption will require improved technologies with lower labour requirement for mechanized deep placement of urea and for the propagation of Azolla.
KeywordN loss N-15 recovery Urea deep placement Azolla Economic benefit
DOI10.1016/j.fcr.2018.01.015
Indexed BySCI
WOS KeywordLOWLAND RICE ; AMMONIA VOLATILIZATION ; CROPPING SYSTEM ; USE EFFICIENCY ; FLOODED RICE ; ORYZA-SATIVA ; MANAGEMENT ; SOIL ; BALANCE ; GROWTH
Language英语
Funding ProjectNational Key Research and Development Project of China[2017YFD0200104] ; National Key Research and Development Project of China[2016YFC0207906]
WOS Research AreaAgriculture
WOS SubjectAgronomy
WOS IDWOS:000427208600015
Funding OrganizationNational Key Research and Development Project of China
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/22836
Collection中国科学院水利部成都山地灾害与环境研究所
Corresponding AuthorYin, Bin
Affiliation1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Jiangsu, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Chengdu Univ Informat Technol, Coll Resources & Environm, Chengdu 610225, Sichuan, Peoples R China;
4.Chinese Acad Sci, Key Lab Mt Surface Proc & Ecol Regulat, Inst Mt Hazaids & Environm, Chengdu 610041, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Yao, Yuanlin,Zhang, Min,Tian, Yuhua,et al. Urea deep placement in combination with Azolla for reducing nitrogen loss and improving fertilizer nitrogen recovery in rice field[J]. FIELD CROPS RESEARCH,2018,218:141-149.
APA Yao, Yuanlin.,Zhang, Min.,Tian, Yuhua.,Zhao, Miao.,Zhang, Bowen.,...&Yin, Bin.(2018).Urea deep placement in combination with Azolla for reducing nitrogen loss and improving fertilizer nitrogen recovery in rice field.FIELD CROPS RESEARCH,218,141-149.
MLA Yao, Yuanlin,et al."Urea deep placement in combination with Azolla for reducing nitrogen loss and improving fertilizer nitrogen recovery in rice field".FIELD CROPS RESEARCH 218(2018):141-149.
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