TY JOUR TI OPTIMIZATION OF HOLES IN THE MATRIX OF A SINGLE-SCREW EXTRUDER FOR PROCESSING OF POULTRY MANURE KW matrix KW extruder KW optimization KW manure KW fertilizer JO Bulletin Samara State Agricultural Academy AU Potapov, M.A. AU Frolov, D.I. AU Kurochkin, A.A. PY 2020 IS 5 PB Samara State Agrarian University