Effects of Water and Nitrogen Coupling on Growth and Photosynthesis in Leaves of Tobacco Seedlings

doi:10.7668/hbnxb.2016.02.031

Abstract

Abstract: In order to determine the reasonable ratio of water and nitrogen in the provisonal planting period of tobacco seedlings.The effects of growth and photosynthesis in leaves of tobacco seedlings was studied under water and nitrogen coupling treatment, when the relative water content of soil is 25% and 50%, the net photosynthetic rate and biomass increased with the increase of nitrogen fertilizer increased, but the relative water content of soil reached 75%, the net photosynthetic rate and biomass were both no difference under different nitrogen fertilizer application.Both of water and nitrogen fertilizer on net photosynthetic rate and biomass were positive correlation, two factors on the effects of net photosynthetic rate and biomass order for soil relative water content > nitrogen fertilizer, and two factors have the most suitable range.By comprehensive analysis suggesting that maintained the soil relative water content at 53%, application nitrogen fertilizer amount 0.49 g/kg could be recommended as the best combination of water and nitrogen in this experimental condition, while that the net photosynthetic rate and biomass reached 8.976 9 μmol/(m²·s) and 0.894 6 g, respectively.

Key words: Flue-cured tobacco, Water and nitrogen coupling, Regression method, Net photosynthetic rate

CLC Number:

S147.21

SONG Hongwei, ZHANG Huihui, HE Guoqiang, LI Hengquan, LIU Weidong, FEI Hongbo, SUN Guangyu. Effects of Water and Nitrogen Coupling on Growth and Photosynthesis in Leaves of Tobacco Seedlings[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(2): 188-194. doi: 10.7668/hbnxb.2016.02.031.

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