Xu X K,Wang Z J.Effects of lanthanum and mixtures of rare earths on ammonium oxidation and mineralization of nitrogen in soil[J].Eur J Soil Sci,2001,52:323-329.
[6]
Xu X K,Wang Z J,Wang Y S,et al.Urea hydrolysis and inorganic N in a luvisol after application of fertilizer containing rare-earth elements [J].A ust J Soil Res,2003,41:741-748.
Xu X K,Zhu W Z,Wang Z J,et al.Accumulation of rare earth elements in maize plants after application of mixtures of rare earth elements and lanthanum[J].Plant Soil,2003,252:267-277.
[9]
Xu X K,Zhu W Z,Wang Z J,et al.Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer[J].Sci Total Environ,2002,293:97-105.
[10]
Kim H T.Soil sampling,preparation and analysis[M].Marcel Dekker,New York,1995.
