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Dynamic responses of growth and gas exchange parameters of Isatis indigotica seedlings to different concentration amide nitrogen.

TANG Xiao-qing**, LU Ting-ting, ZHANG Yi, LI Yan, YANG Yue, SHI Sheng-lu, WANG Kang-cai   

  1. (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2015-01-10 Published:2015-01-10

Abstract: The responses of the growth and gas exchange parameters of Isatis indigotica seedlings to amide nitrogen applied at different levels and frequencies were studied. The results showed that application of amide nitrogen at a suitable concentration increased leaf chlorophyll relative content (SPAD), net photosynthetic rate (Pn), transpiration rate (Tr) and intercellular carbon dioxide concentration (Ci) in I. indigotica leaves, and obviously improved the taproot diameter, the fresh weights of leaves and roots, in which the promoting effect of application two times of 1.0%-1.5% amide nitrogen was more stronger. It was suggested that 1.0%-1.5% pure urea could be used for improving the biomass accumulation of leaves and roots in the prestage of I. indigotica seedling cultivation.

Key words: CDOM, Erlonghu Reservoir, East Liaohe River, absorption characteristics, particulate matter