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Journal of Tea Science ›› 2011, Vol. 31 ›› Issue (6): 513-520.doi: 10.13305/j.cnki.jts.2011.06.013

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NO3--N Concentration and Net Nitrification Rate in Tea Soils

HAN Wen-yan1,2, XU Jian-ming1*   

  1. 1. Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310058, China;
    2. Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China
  • Received:2011-08-18 Revised:2011-09-09 Online:2011-12-15 Published:2019-09-09

Abstract: An investigation of NO3--N concentration and net nitrification rate in 130 tea soil samples was conducted. The net nitrification rate was measured by laboratory incubation method. The results showed that the NO3- -N concentration ranged from 0 to 286.8mg/kg with a mean of 41.7mg/kg. Among all the samples, 40.8% of the soils were less than 20mg/kg in NO3- -N concentration. Soil NO3- -N concentration had a significant relationship with N application rate, but no obvious relation with soil net nitrification rate. A quadratic equation Y=738.0-289.9X+28.8X2r2=0.2033, P<0.001) was established between NO3--N concentration (Y) and pH (X). Soil net nitrification rate ranged from -6.08 to 6.54 with a mean of 1.62mg/kg·d, and coefficient of variation (CV) was as high as 119%. 10% of the soil samples were below 0 in net nitrification rate, indicating net immobilization of nitrate happened in these soils. Net nitrification rate was positively and significantly related with N application rate. And an inverse function Y=10.14-33.96/Xr2=0.253, P<0.001)was found between net nitrification rate (Y) and soil pH (X). Why nitrate accumulated in tea soils and relationship between nitrification and pH was discussed.

Key words: tea, soil, pH, nitrate concentration, net nitrification rate

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