철쭉의 無機養分 含量變化와 鐵 葉面撒布 效果 = Seasonal Change of Inorganic Nutrients and Effect of FeSO₄ Foliar Application on Rhododendron

국문 초록 (Abstract)

本 實驗에서는 造景用 花木으로 露地에 植栽되어 있는 왜철쭉(Rhododendron indicum)과 왜진달래(Rhododendron obtusum)를 供試하여 잎의 無機養分 含量을 經時的으로 調査하고, 鐵 葉面分布效果을 究明하여 철쭉 栽培의 基礎資料를 얻고자 遂行하였다.
1. 잎의 燐分含量은 全生育期間中 왜철쭉 선형이 가장 높았다. 그러므로 왜철쭉 선형은 燐分要求量이 다른 것에 비해 많은 것으로 추측된다.
2. 잎의 칼리含量은 經時的으로 種間에 잎形別로 큰 차이가 없었고 왜철쭉, 왜진달래 모두 철쭉의 칼리 適正含量 範圍에 들었다.
3. 잎의 石灰含量은 왜철쭉, 왜진달래 모두 5·6월 洛花直後에 가장 낮았고, 왜철쭉이 왜진달래에 비해 높았다.
4. 잎의 苦土含量은 7월에 種別로 차이가 컸으며, 왜진달래가 왜철쭉 보다 全生育期間中 苦土含量이 높은 상태로 유지되었다.
5. 잎의 鐵 含量은 4월과 10월에 높게 나타났고, 왜진달래가 왜철쭉보다 鐵 含量이 많았으며 4월부터 10월까지 鐵 含量의 經時的 變化는 w字形이었다.
6. 철 缺?株에 FeSO₄ 葉面散布로 chlorophyll a와 b가 모두 증가하였으며, chlorophyll a보다 b含量이 더 증가하였다. 그리고 철쭉 잎중의 P, K, Ca, Mg 含量變化는 有意差가 없었으나 鐵 含量은 차이가 컸다.

다국어 초록 (Multilingual Abstract)

This study was conducted to confirm the optimum method of fertilizer application of rhododendrons by determination of various inorganic contents in leaves of Rhododendron indicum and R. obtusum during growing season. And this study was also conducted to determine the effect of foliar application of iron on rhododendrons. The results were summarized as follows ;
1. The phosphorus contents in leaves were highest in linear-type of R. indicum throughout growing season. So phosphorus requirement of linear-type of R indicum might be higher than others.
2. There was no difference in potassium contents in leaves between species, and among leaf types.
3. The caclium content of R. obtusum was lowest in May and June in R. indicum, just after flower abscission, and the content was higher in R. indicum that R. obtusum.
4. The magnesium contents in R. obtusum was higher than R. indicum throughout the growing season. And the differences of magnesium contents between species were biggest in July.
5. The iron contents were higher in April and October than the other seasons. The content was higher in R. obtusum than R. indicum. From April to October, the curves of content looks like "W"-shape.
6. The chlrophyll a and b contents increased in iron deficient plants by foliar application of FeSO₄ solution. And the increase of chlorophyll b content was higher than chlorophyll a. After spray application, there was no differences in the contents of phosphorus, potassium, calcium, and magnesium, but iron content was increased by the treatment.