Effects of Boron Application on the Outbreak of Granville wilt in Flue-cured Tobacco

붕소시용에 잎담배입고병발생에 미치는 영향

This experiment was carried out to study the effect of boron application on the physiological response and the outbreak of Granville wilt flue-cured tobacco. NC2326 and Coker 86(flue-cured tobacco) were transplante dand investigated in all field culture plots for this experiment. Elongation of shoots were retarded, and stem heights were shortened in all boron applied plots and the more boron applied, the greater these tendency was. The ratio of root branching and root discoloration, and contraction by Granville wilt were docreased markedly in boron plots. Amount of harvested loaves (yield) was increased greatly in 2 and 4kg plots of borax and boric acid per 10a, and the increasing tendency was greater in NC2326 variety than Coker 86. Phenol compounds content in harvested leaves were higher in boron applied plots than non-applied, and was higher in Coker 86, Granville wilt resistant variety, than NC2326. The more boron applied, the higher nicotine content in the harvested leaves was.

본시험은 붕소시용이 잎담배의 생리적특성과 입고병 발생에 미치는 영향을 구명하고자 황색종인 NC2326, Coker 86을 공시하여 입고병포장에서 실시한바 그 결과를 요약하면 다음과 같다. 1. 붕소시용량이 증가할수록 지상부의 생장이 지연되었고 간장은 낮아졌으나 붕우시용구에서 세근발달이 억제되고 뿌리의 부패율과 입고병이병율이 크게 감소 되여 입고병발생에 간접적인 효과가 있었다. 2. 수량은 10a당 붕소 또는 붕산 $2\~4kg$ 시용구에서 높았고 붕소시용에 따른 증수경향은 NC2326에서 컸다. 3. 건엽중의 Phenol 화합물은 붕소시용구에서 증가하였고 입고병저항성이 큰 Coker 86에서 더 많았으며 니코친합량은 붕소시용량이 증가할수록 감소하였다.