Applying Rules of Tajweed to Athkaar, Durood and Du’aas

Question: Is it waajib to apply the rules of Tajweed to Athkaar, Durood and Du’aas?

Answer: 

The rules of madde-far’i, ghunnah, ikhfa and qalqalah are applicable to Tilaawat of the Quraan Kareem, not to Athkaar, Durood and Du’aas.