Uptake efficiency of 15 N-urea in flooded and aerobic rice fields under semi-arid conditions
OAR@ICRISAT
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Relation |
http://oar.icrisat.org/8868/
http://dx.doi.org/10.1007/s10333-014-0473-8 10.1007/s10333-014-0473-8 |
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Title |
Uptake efficiency of 15 N-urea in flooded and aerobic rice fields under semi-arid conditions
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Creator |
Kadiyala, M D M
Mylavarapu, R S Li, Y C Reddy, G B Reddy, K R Reddy, M D |
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Subject |
Agriculture-Farming, Production, Technology, Economics
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Description |
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.
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Publisher |
Springer Japan
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Date |
2014-12-19
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Language |
en
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Rights |
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Identifier |
http://oar.icrisat.org/8868/1/art%253A10.1007%252Fs10333-014-0473-8.pdf
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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