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• W3201867711 abstract "Abstract Aims Enhanced nitrogen (N) and water uptake from deep soil layers may increase resource use efficiency whilst maintaining yield under stressed conditions. Winter oilseed rape ( Brassica napus L.) can develop deep roots and access deep-stored resources such as N and water, while this potential has large uncertainties in variable environments. In this study, we aimed to evaluate the effects of reduced N and water supply on deep N and water uptake. Methods Oilseed rape plants grown in outdoor rhizotrons were supplied with 240 and 80 kg N ha -1 respectively in 2019 whereas a well-watered and a water-deficit treatment were established in 2020. To track deep water and N uptake, a mixture of 2 H 2 O and Ca( 15 NO 3 ) 2 was injected into the soil column at 0.5 and 1.7 m depths. δ 2 H in transpiration water and δ 15 N in leaves were measured after injection. δ 15 N in biomass samples were also measured. Results Differences in N or water supply had little effect on root growth. The low N treatment reduced water uptake throughout the soil profile, but caused a non-significant increment in 15 N uptake efficiency at both 0.5 and 1.7 m. Water deficit in the upper soil layers led to compensatory deep water, while N uptake was not altered by soil water status. Conclusion Our findings demonstrate that for winter oilseed rape, high N application and water deficiency in shallow layers increases deep water uptake, and that the efficiency of deep N uptake is mainly sensitive to N supply rather than water supply." @default.
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• W3201867711 date "2021-09-30" @default.
• W3201867711 modified "2023-10-16" @default.
• W3201867711 title "Dynamics of deep water and N uptake under varied N and water supply" @default.
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• W3201867711 doi "https://doi.org/10.1101/2021.09.27.461951" @default.
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