Fixed Ammonium Contents and NH Fixation Capaci-ties of Some Cnltivated Soils in ChinaEnglish Full Text

WEN QI-XIAO, CHENG LI-LI and ZHANG XIAO-HUA(Institute of Soil Science, Academia Sinica, Nanjing 210008 )(China)

Abstract: Fixed ammonium contents and fixation capacities of some representative cultivated soils collectedfrom 16 provinces of China were studied. Results showed that the contents of fixed ammonium in soilsranged from 35 to 573 mg N kg￣（-1）, with an average of 198 mg N kg￣（-1）. The content of fixed ammoniumcorrelated very significantly with mica content for tropical and subtropical soils, whereas this was not thecase for soils in the temperate zone. At the end of K-exhansting experiment the fixed ammonium contentincreased in most soils studied. However, it decreased in some temperate soils. Generally, fixation of addedNH could not be found either before or after K-exhausting experiment for highly weathered soils, includingtropical soils and soils derived from granite-gneiss or Quaternary red clays in the subtropic zonet while formost soils in the Yangtze River dalta the NH fixation capacity was rather high and increased siguificantlyin the K-exhausted soils.

Keywords：

clay minerals; fixed ammoninm; mica; fixation capacity;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S158.3

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Fixed Ammonium Contents and NH Fixation Capaci-ties of Some Cnltivated Soils in ChinaEnglish Full Text

WEN QI-XIAO, CHENG LI-LI and ZHANG XIAO-HUA(Institute of Soil Science, Academia Sinica, Nanjing 210008 )(China)

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