Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2002.54.59AzamF. 1200211Application of fertilizer N to soil or to the soil-plant system often leads to enhanced mineralization and plant availability of N. By using 15N isotope methodology, it has been found that the extra N comes from soil organic matter as a result of interaction of the added N. This phenomenon is termed "priming" action or added nitrogen interaction (ANI) and may be apparent or real and positive or negative. Apparent ANI is supposedly caused by pool substitution, while real ANI results from changes in the processes that move N into or out of a given pool. Although ANI is generally positive, negative ANIs may arise from processes like net immobilization, denitrification and NO3- leaching. Occurrence of ANI has implications to the determination of fertilizer use efficiency as well as to the fate of fertilizer and soil N. Hence, an understanding of the occurrence of ANI and the mechanisms involved is necessary to devise strategies for improved fertilizer management practices.]]>Andrews, R.E. and E.I. Newman,19705319334Ashraf, M. and F. Azam,199815N applied to wheat at different growth stages.]]>26397404Azam, F.,1990125255262Azam, F.,199213107115Azam, F., A. Lodhi and M. Ashraf,199115N-labeled ammonium nitrogen with native soil nitrogen during incubation and growth of maize (Zea mays L.).]]>23473477Azam, F., A. Lodhi, M. Ashraf and M.I. Sajjad,1993142228Azam, F., F.W. Simmons and R.L. Mulvaney,1993155054Azam, F., F.W. Simmons and R.L. Mulvancy,19932517871792Azam, F., F.W. Simmons and R.L. Mulvaney,19941899102Azam, F., F.W. Simmons and R.L. Mulvaney,199418103118Azam, F., M. Ashraf and A. Lodhi,199374751Azam, F.M.A., A. Lodhi and M.I. Sajjad,1990Triticum aestivum L.) following rice straw amendment.]]>10134138Azam, F., M. Ashraf, A. Lodhi and M.I. Sajjad,1991Oryza sativa L.).]]>115761Azam, F., M. 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