Responses of rice yield and the fate of fertilizer nitrogen to soil organic carbon

Weifu Peng, Yongjun Zeng, Qinghua Shi and Shan Huang
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Weifu Peng: Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang, P.R. China
Yongjun Zeng: Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang, P.R. China
Qinghua Shi: Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang, P.R. China

Plant, Soil and Environment, 2017, vol. 63, issue 9, 416-421

Abstract: Soil organic carbon (SOC) plays a critical role in rice production, but its feedback to the fate of fertilizer nitrogen (N) is not clear. In this study, a pot experiment was conducted to investigate the responses of rice yield and the fate of fertilizer N to different SOC levels using 15N-labelled urea. The results showed that rice biomass, yield and the total N uptake increased significantly with increasing SOC content. Both rice N uptake from soil and urea increased significantly with increasing SOC content. The recovery rate and residual rate of fertilizer N improved significantly with increasing SOC content, leading to a reduced rate of not-specified fertilizer N. Therefore, it was concluded that high SOC could not only improve rice yield and fertilizer N recovery, but also could increase the retention of fertilizer N and decrease the not-specified N in the paddy soil.

Keywords: Oryza sativa; isotope tracing; soil fertility; fertilization; flooded rice system; macronutrient (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:63:y:2017:i:9:id:389-2017-pse

DOI: 10.17221/389/2017-PSE

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