ObjectivesThe objective of this study was to research the influence of soil salt-ion content on accumulation, translocation and utilization efficiency of nitrogen in rapeseed.
MethodsRapeseed cultivars of Ningza 1818 and Yanyouza 3 were planted in soils with salt contents of 2.7 g/kg (low salt) and 4.4 g/kg (high salt) in 2014–2015 and 2015–2016. Samples of the deciduous leaves were collected regularly. The dry matter weight, N content were measured, and the seed qualities were determined. The characteristics of nitrogen accumulation, translocation rate and use efficiency for grain production (NUEg) were calculated.
ResultsThe early flowering stage and ripening stage of rapeseed in high salt soil started 3 to 4 days later compared with those in low salt soil, the yields, biomass and N accumulation amounts were decreased. The average yield decline ranges of Ningza 1818 and Yanyouza 3 were 23.6% and 26.1%, the average oil content decline ranges were all 4.6%, and the average protein content increase ranges were 6.4% and 9.4%, respectively. The N translocation rates in roots and leaves in both soils were similar, but those in stems were decreased with the average decline range of 14.2% in both cultivars, and the NUEg were decreased in the average range of 6.8% in Ningza 1818 and 9.3% in Yanyouza 3, respectively.
ConclusionsIn high salt content soil, the yield, biomass, N accumulation amount and oil content of rapeseed are decreased, and the protein content is increased. The significant decrease in nitrogen translocation rate of stem might be one of the mechanisms for the reduced NUEg.
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