Difficultly Extractable Fixed Ammonium in Some Soils of China

来源 :土壤圈:英文版 | 被引量 : 0次 | 上传用户:kk345
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Ninety-three soil samples and 19 sedimentary rock samples collected from 21 provinces of China were analyzed for their contents of fixed ammonium and total N by Kjeldahl-HF method.Results showed that amount of difficultly extractable fixed ammonium(the fi
其他文献
Four testing methods using cation exchange membrane (CEM),ammonium acetate,ASI(0.25mol L^-1 NaHCO3+0.01mol L^-1 EDTA +0.01 molL^-1 NH4F) and 1.0molL^-1 boiling
Nitrogen(N)losses from ammonium bicarbonate or urea applied to wheat and then followed immediately by irrigation were investigated.Ammonia volatilization was de
The release of hydroxyl ions from two variable charge soils associaed with the adsorption of chloride in NaClO4 solutions was examined.The complete release requ
Field experiments were carried out with rice variety of Shenong 91 of short culms and erect panicles to study nutrient contents in high-yiedlding rice plants an
Techniques for measurement of the N status of rice can be an aid to making manaement decisions with economic and environmental implications.A field experiment w
Soil samples collected from several acid soils in Guangdong,Fujian,Zhejiang and Anhui provinces of the southern China were employded to characterize the chemica
Water-soluble rare earth elements(WSREEs) of four typical soil profiles in China were determined by using a high-resolution inductively coupled plasma mass spec
Individual and combined effects of Cu,Pb,Zn and Cd on N mineralization,urease and phosphatase were examined in a Typic Udic Ferrisol in laboratory by employing
Nitrogen mineralization in forest soil wa studied in laboratory by incubating undisturbed soil cores enclosed within PVC columns at different temperatures to co
A quite severe degradation was found in all seven types of grasslands in the study area involiving 12 counties of the northwestern Qinghai Province.The slightly