What is fumigation and there full study     Hydrogen cyanide or Hydrocyanic acid(HCN)                     Trade name : Cynogas; Formulation : Dust; Dose : 10-16 g NaCH 98% pure with 20-30 ml H2SO4 and 40-60 ml water/m3 for general fumigation. Use : It is useful for disinfection of plant material intended for propagation. The plants