Do you know of any reference for mathematical modeling of microbial degradation of fertilizers ?

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Thiele-Bruhn Sören

You may consider the various contributions of Donald Sparks on reaction kinetics in textbooks and reviw papers (e.g. Environmental Soil Chemistry, Soil Physical Chemistry) and the book from Martin Alexander (Biodegradation and Bioremediation) with a nice chpater on degradation kinetics.

Sayed Ameenuddin Irfan

Thank you Prof .Thiele-Bruhn Sören and Dr. Rolland H. Yemadje for your help. your answers are very helpful to me. Thanks once again.