Abstract
After examining the difference in the photosynthesis rate of corn according to the planting distance, the distance of $40{\times}40cm$ showed the lowest rate by 23 days after transplanting (May 31); however, there was no significant difference in the photosynthesis rate due to increased salt tolerance in the plant as time went by. As for the difference in growth features of a plant, the planting distance of $40{\times}40cm$ showed a growing disorder due to the influence of salt by 23 days after trans-plantation (May 31); however, there was a desirable growth as time went by. For the difference in the salt content within a plant, the planting distance of $40{\times}40cm$ tended to be higher than other planting distances, and the K+ content is much higher than other kinds of salt after examining the difference in salt absorption. As for the correlation between saline components within a plant, there was a significant negative correlation among $K^{+},\;Ca^{2+},\;and\;Na^{+}$ while there was a significant positive correlation among $Mg^{2+},\;Ca^{2+}$, and Na+. After examining the effectiveness of salt removal from soil according to com cultivation, the planting distance of $30{\times}30cm$ showed a remarkable decrease by 37 days, compared with 23 days, after transplantation in $K^{+}$ by 28%, $Ca^{2+}$ by 36.6%, $Mg^{2+}$ by 30.6%, and $Na^{+}$ by 22.9%. And the salt content is higher in surface soil than in subsoil.
재식거리에 따른 옥수수의 광합성율의 차이를 보면, 이식 후 23일째(5월 31일)에 재식거리 $40{\times}40cm$에서 제일 낮게 나타났으나, 시일이 지나면서 식물체의 내염성 증가로 광합성율이 큰 차이는 보이지 않았다. 식물체의 생육특성의 차이를 보면, 이식 후 23일째(5월 31일)에 염류의 영향으로 재식거리 $40{\times}40cm$에서 생육저해가 나타났지만, 시일이 지나면서 왕성한 생장을 보였다. 식물체내의 염분함량의 차이를 보면, 대체로 재식거리 $40{\times}40cm$에서 다른 재식거리보다 높은 경향을 보였으며, 염류흡수 차이를 보면 $K^{+}$ 함량이 다른 염류함량보다 훨씬 높게 나타났다. 옥수수의 재배에 따른 토양의 제염효과를 보면, 재식거리 $30{\times}30cm$에서 $K^{+}$는 28%, $Ca^{2+}$는 36.6%, $Mg^{2+}$는 30.6%, $Na^{+}$는 22.9%로 이식 후 37일째(6월 14일)에서 이식 후 23일째(5월 31)에 비해 현저하게 감소하였다. 또한 표토의 염류함량이 심토보다 높게 나타났다.
