Uptake efficiency of 15 N-urea in flooded and aerobic rice fields under semi-arid conditions

Kadiyala, M D M and Mylavarapu, R S and Li, Y C and Reddy, G B and Reddy, K R and Reddy, M D (2014) Uptake efficiency of 15 N-urea in flooded and aerobic rice fields under semi-arid conditions. Paddy and Water Environment. ISSN 1611-2490

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Abstract

The sustainability of traditional rice (Oryza sativa L.) cultivation in many Asian countries is being questioned due to severe water shortage conditions, envisaging the need for development of water-saving rice production technologies. A 2-year-field study on a typic Haplustalf soil was conducted to compare traditional transplanted rice–maize system with water-saving aerobic rice–maize system, with an overall objective of investigating the fate of fertilizer nitrogen (N) using 15N-labeled urea. Results from the field experiments showed that the rice plants positively responded to N fertilizer application. The average fertilizer N recovery by rice crop over the 2 years in aerobic rice was 26 kg per 100 kg of applied fertilizer N in the main field and 21 kg per 100 kg of applied N in the microplot, while the recoveries were 41 and 32 kg ha−1 per 100 kg of applied N in traditionally cultivated rice under flooded conditions. The fraction of 15N that was found in soil after the harvest of rice crop ranged from 11.4 to 47.1 kg ha−1 in aerobic rice and 14.2–51.4 kg ha−1 in flooded rice. Average recovery of 15N fertilizer in maize after the first growing season was 3.3 %, and the corresponding recovery in soil was 19 %. An additional 1.3 % of the fertilizer was recovered by crops during the two subsequent seasons. This study indicates the need to develop management practices that improve N use efficiency in aerobic rice by reducing losses to improve yields and reduce N export to the environment.

Item Type:	Article
Divisions:	RP-Market Institutions and Policies
CRP:	CGIAR Research Program on Policies, Institutions, and Markets (PIM)
Uncontrolled Keywords:	Aerobic rice; 15N-labeled nitrogen; Nitrogen use efficiency; Residual N
Subjects:	Others > Agriculture-Farming, Production, Technology, Economics
Depositing User:	Mr Ramesh K
Date Deposited:	16 Jul 2015 08:02
Last Modified:	18 Oct 2016 09:59
URI:	http://oar.icrisat.org/id/eprint/8868
Official URL:	http://dx.doi.org/10.1007/s10333-014-0473-8
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Google Scholar

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