A Study on Gravity Penetration of Fumigants in the Jumbo Silo

대형싸이로에 있어서 훈증제의 수직적 침투력

  • Hah Jae Kyu (National Plant Quarantine Office) ;
  • Oh Jung Woo (National Plant Quarantine office, Inchon Branch) ;
  • Yoo Ki Yul (National Plant Quarantine Office) ;
  • Kim Byung Ho (National Plant Quarantine office, Inchon Branch)
  • Published : 1981.06.01


This experiment was carried out to investigate the vertical penetration and diffusion of fumigants for soybean disinfection in jumbo silo. The results were as follows, 1. Using the methylbromide independently as a soybean fumigant, penetration and diffusing velocity of methylbromide gas which moved from the top to the bottom through the vertica1 silo was too rapidly, it was possible to find out more 60mg/l of methylbromide gas concentration at bottom of silo within 4 hours after beginning the fumigation. And it showed the tendency of reducing methylbromide gas concentration gradually over the 10 hours from tile beginning the fumigation. 2. In case of added $CO_2$ gas to the methylbromide as a carrier is much more rapid velocity of penetration and diffusion of methylbromide gas than that of methylbromide gas independently. Therefore methylbromide gas concentration at bottom of silo was detected over the 70mg/l within 1.5 hours after beginning the fumigation.. 3. On the other hand, hence the phostoxin as a soybean fumigant was less velocity of Penetration and diffusion of the gas through the vertical silo compare to methylbromide gas, the phostoxin gas concentration couldn't detect over the 10mg/1 during the whole fumigation period at the bottomside of silo. 4. Test insects (rice weevil; sitophilus oryzae. L.) inserted at bottom of silo for examine the fumigation effect were killed completly by using the methylbromide independently and added $CO_2$ gas to methylbromide, while using the phostoxin the test insects were most alive.