본 연구는 팔레놉시스의 생육에 적합한 배양액내 $NO_3^-$와 $NH_4^+$의 비율을 찾고 그리고 그 비율이 화경의 품질에 미치는 영향에 대하여 알아보고자 수행되었다. 실험에 사용된 배양액내 $NO_3^-$와 $NH_4^+$의 비율은 100%: 0%, 90%: 10%, 80%: 20%, 70%: 30%였다. 배양액내 팔레놉시스의 생육은$NO_3^-$만을 공급할 때보다 $NO_3^-$와 $NH_4^+$를 함께 공급할 때 생육이 증가하였다. 특히 $NH_4^+$의 비율이 10%일 때 생체중과 건물중이 가장 높았다. 그러나 배양액내 $NH_4^+$의 비율이 10%에서 30%로 증가함에 따라 지상부와 뿌리의 생육은 감소 되었다. 화경의 길이, 개체당 화경수와 소화수 모두 $NH_4^+$ 비율이 0%에서 10%로 증가함에 따라 높았으나 30%로 높아질수록 감소하였다. 즉, 팔레놉시스의 생육에 적합한 배양액내 $NO_3^-$와 $NH_4^+$의 비율은 90%:10%이었다.
This experiment was carried out to find optimum ratio of $NO_3^-$ to $NH_4^+$ in nutrient solution for the growth of Phalaenopsis hybrid and find the effect of the ratio of $NO_3^-$ to $NH_4^+$ on the flower stem (inflorescence) quality. The ratio of $NO_3^-$ to $NH_4^+$ of nutrient solution used in this experiment was 100% : 0%, 90% : 10%, 80% : 20% and 70% : 30%. Phalaenopsis showed better growth when $NH_4^+$ was supplied concurrently with $NO_3^-$ as nitrogen source than supplied with only $NO_3^-$. Especially, increasing the ratio of $NH_4^+$ from 0% to 10% the fresh weight and dry weight of Phalaenopsis hybrid was highest. But, the growth of shoot and root was diminished when the proportion of $NH_4^+$ in nutrient solution was increased from 10% to 30%. Inflorescence length, the number of inflorescence and flower per plant all increased as $NH_4^+$ increased from 0% to 10% but, decreased from 10% to 30%. These results suggest that the optimal ratio of $NO_3^-$ and $NH_4^+$ in nutrient solution for the growth of Phalaenopsis including inflorescence was founded to be 90%:10%.
