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- W1966650448 abstract "Abstract Growth, N uptake and light interception were studied in processing tomato grown in the field in Central Italy (Tiber Valley, 43°N, elev. 165 m) at different levels of fertiliser-N in 1996–97–99. Plant N concentration declined during the entire crop cycle. The relationship between the total above-ground dry biomass (DW, Mg ha −1 ) and critical N concentration (%Nc, the minimum N concentration required for maximum plant growth, calculated according to Justes et al., Ann. Bot., 1994, 74, 397–407) was %Nc=4.53 DW −0.327 for total-N, and %Nc=3.90 DW −0.270 for reduced-N. The critical dilution curves were applied when the above-ground dry biomass varied between 1.2 and 12.4 Mg ha −1 and for stages of development ranging from the onset of fruit growth (∼40 days after transplanting) to maturity. Increasing N availability increased dry matter accumulation. Relationships between crop total-N uptake (Nupt, kg N ha −1 ) and accumulated dry matter in the aerial biomass (DW, Mg ha −1 ) fit very well to the model Nupt=10 a DW 1− b (Lemaire and Salette, Agronomie, 1984, 7, 381–389) for each fertiliser-N level in all three experiments. In all years the ‘critical uptake’ curve (Nupt=45.3 DW 0.673 ) was between the uptake curves obtained with the fertiliser-N rates of 100 and 200 kg ha −1 . Increasing N supply increased the amount of absorbed PAR accumulated throughout the growth cycle and slightly affected the Radiation Use Efficiency. Results are discussed also taking into account the effect of N availability on source-sink relationships." @default.
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- W1966650448 date "2002-12-01" @default.
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- W1966650448 title "Critical nitrogen concentration in processing tomato" @default.
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- W1966650448 doi "https://doi.org/10.1016/s1161-0301(02)00096-5" @default.
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