Photosynthetica (Jul 2019)

Light-response characteristics of photosynthesis of drip-irrigated sugar beet under different nitrogen fertilizer managements

  • C. FEI,
  • J.X. SU,
  • Y.Y. LI,
  • Z.F. LI,
  • K.Y. WANG,
  • H. FAN,
  • F.Y. MA

DOI
https://doi.org/10.32615/ps.2019.089
Journal volume & issue
Vol. 57, no. 3
pp. 804 – 811

Abstract

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Effects of two split application ratios of nitrogen fertilizer (R1: half of the total nitrogen fertilizer was applied on 13 June, and the rest was applied on 1 July; R2: two equal amounts of N fertilizer accounting for 70% of total were applied on 15 June and 1 July, respectively, and the rest was applied on 1 August) and three N fertilizer application rates (75, 150, and 225 kg ha-1) on chlorophyll content, photosynthetic characteristics, and root yield of sugar beets were studied. The results showed that with N fertilizer application rates of 150 and 225 kg ha-1, R2 treatment significantly decreased light-compensation point, but increased light-saturation point and actual photochemical efficiency at the storage root development compared to R1 treatment. The R2 treatment with the N fertilizer application rate of 150 kg ha-1 significantly increased sugar yield by 5-29% compared to other treatments.

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