Responses of rice yield and the fate of fertilizer nitrogen to soil organic carbon
Weifu Peng, Yongjun Zeng, Qinghua Shi, Shan Huanghttps://doi.org/10.17221/389/2017-PSECitation:Peng W., Zeng Y., Shi Q., Huang S. (2017): Responses of rice yield and the fate of fertilizer nitrogen to soil organic carbon. Plant Soil Environ., 63: 416-421.
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; macronutrientReferences:
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