Effects of Planting Density and Fertilizer Level on the Growth, Yield, Quality and Nitrogenous Compounds of Burley Tobacco

재식밀도 및 시비량이 버어리종 잎담배의 생육, 수량, 품질 및 질소화합물에 미치는 영향

Under the different conditions of planting density and compound fertilizer level, some agronomic and chemical characteristics of burley tobacco were investigated from 1982 to 1984. Leaf area and dry leaf weight per plant, crop growth rate, relative growth rate and net assimilation rate for 40-60 days after transplanting were higher with increasing plant spacing and fertilizer, but leaf area index was lower with increasing plant spacing. At topping stage, the leaf size was increased with increasing plant spacing and amount of fertilizer applied and the stem diameter was increased by increasing plant spacing. Leaf area, leaf weight per plant and weight per unit leaf area of harvested leaf were higher when plant spacing and fertilizer increased. It was estimated that the optimum plant spacing was 105cm x 34cm and level of com-pound fertilizer (N-P$_2$ O$\sub$5/ -K$_2$O =10-10-20) was 263kg/l0a for high yield. There were trends toward increase the contents of total alkaloid and total nitrogen with increasing plant spacing and fertilizer application. There was significant positive correlation between plant spacing and total nitrogen, and between fertilizer application and total nitrogen. The plant spacing of 105cm x 35 to 40cm and 227.5kg/l0a of fertilizer level may be profitable for farm economy and the low nitrogenous leaf.

재식밀도 및 시비량이 버어리종 잎담배의 몇 가지 농경학적, 화학적 형질에 미치는 영향을 3개년 (1982∼84)에 걸쳐 조사 분석하였다. 1. 이식후 40∼60일의 주당엽면적과 엽중, 군낙생장율, 상대생장율, 순동비율은 소식, 증비함에 따라 높아졌으나, 엽면적지수는 소식에 의하여 낮아졌다. 적심기의 잎크기는 소식, 증비수록 커졌고, 탁경은 소식에 의하여 커졌다. 2. 수확엽의 엽면적과 엽면적과 단위엽면적중은 소식, 증비구에서 유의성 있게 높았다. 그러나, 회선곡선상에서 수량제고를 위한 적정재식거리는 105cmx34cm, 복합비료시용량은 263kg/10a로 확정되었다. 3 전알칼로이드 및 전질소함량은 소식, 증비구에서 높은 경향이었으며, 재식거리와 전질소함량, 시비량과 전질소함량간에는 정의 상관이 인정되었다. 4. 농가경제와 질소화합량이 낮은 잎담배 생산을 위하여는 재식거리는 105cmx(35∼40)cm, 시비량은 227.5kg/10a이 유리하였다.