STUDIES ON THE CHLORINE OF BURLEY TOBACCO PLANTS VI. THE EFFECT OF REMOVAL TIME OF MULCHED POLYETHYLENE FILM ON THE CHLORINE CONTENTS OF SOIL AND TOBACCO LEAVES

버어리종 담배의 염소에 관한 연구 VI. 폴리에칠렌 피복필림 제거시기가 토양과 잎담배의 염소함량에 미치는 영향

Effect of removal time of mulched polyethylene film on the chlorine content of toP soil and on the chlorine absorption by burley tobacco Plants was investigated under the field condition in 1986 and 1987. Treatment consisted of 4 removal times (from 30 to 75 days after transplanting with IS days interval) and control (no removal). The chlorine content of top Boll at 15 days after removal of mulched polyethylene film(MPF) lowered temporarily, and the decrement of chlorine content of top soil was closely related to the sum of rainfalls after removal of MPF. The chlorine was accumulated much in upper leaves when the MPF being removed early, while the chlorine was accumulated much in lower loaves when the MPF being removed late, relatively. However, the removal of MPF had no effect on the chlorine content of whole leaf. The yield decreased with removal of MPF during growing period.