Plant Soil Environ., 2017, 63(9):416-421 | DOI: 10.17221/389/2017-PSE

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

Weifu PENG, Yongjun ZENG, Qinghua SHI, Shan HUANG*
Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang, P.R. China

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

Published: September 30, 2017  Show citation

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PENG W, ZENG Y, SHI Q, HUANG S. Responses of rice yield and the fate of fertilizer nitrogen to soil organic carbon. Plant Soil Environ. 2017;63(9):416-421. doi: 10.17221/389/2017-PSE.
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