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- 저자 : 朴武彦(M. E. Park) (검색결과 4 건)
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山地 果樹園에서 發生하는 矮性 사과나무의 發育不振과 枯死現象의 原因究明과 對策을 위한 基礎硏究(Ⅱ)
柳順昊,朴武彦,高光出 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.1
Physical and chemical properties of soils of non-cultivated zone between plant standings were analyzed to elucidate their effects on the internal bark necrosis of dwarf apple tree grown on the newly reclaimed highland. Leaf analysis was also made to seek any relationship between nutritional balance in the leaf and the degree of peeling-off known as self-curing symptom of internal bark necrosis. The orchard of dwarf apple tree was 11 years old and established on Osan sandy loam soil (coarse loamy mesic family of Typic Dystrochrepts). The results are summarized as follows: 1. Roots of the dwarf apple tree were distributed more in horizontal direction than vertical direction and root mass in the soil decreased logarithmically with increase of soil hardness. 2. Available phosphated and boron content of the soils in the non-cultivated zone between plants showed positive correlation with trunk diameter, cannopy width, and fruit setting of the apple tree, while Mg and Mn contents were negatively correlated with cannopy width and fruit setting. 3. Fruit setting rate and size of apple were increased with the degree of bark peeling-off (the symptom of bark necrosis recovery). However, the symptom was not necessarily related to nutrient contents of leaf and branch bark. 4. Soil moisture contents determined in situ one day after the rain-fall varied with sites and the moisture data showed that the higher the moisture content, the lighter the growth retardation and necrosis symptom. 5. Leaf analysis for nutrient contents showed that N, K and Ca were in optimum level, B and P in lower level than optimum, and Mn in excessive level respectively. 6. Organic matter and available phosphate contents of the studied soil were lower than national average value of apple orchard soil. However, potassium content of the soil was higher than the national average.
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山地 果樹園에서 發生하는 矮性 사과나무의 發育不振과 枯死現象의 原因究明과 對策을 위한 基礎 硏究(I)
高光出,柳順昊,朴武彦 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1
In order to find out the causes of the growth-retardation by the soil-enviromental and physiologically unbalanced conditions in the dwarf apple trees. relationships between nutrient concentration in leaf and soil growth characters were studied on the combination of three and two varieties of stocks and scions. respectively. in the ten-year-old orchard established on Osan silt loam(Co-arse loamy mesic family of Typic Dystrochrepts). The results are summarized as follows: 1. Basic growth characters representing the past growing history such as tree height canopy width and trunk thickness were remarkably taller broader and thicker in the normal trees than in the retarded ones with physiological abnormal symptom. However yearly changeable growth characters like shoot length number of the fully developed leaves and fruit setting rate were better in abnormal trees in normal ones because of the recent intensive improvement of fertilization for the growth-retarded trees. 2. Basic growth difference between normal and abnormal trees was largest in M26 smallest in MM106. 3. Although the contents of N. P. K. Ca and Mg in leaf were at standard level, two nutrients. B and Mn particulary in the leaf of abnoumal tree, were quite lower and higher, respectively, than the general standard level for the good growth of apple trees. 4. Surface soils had higher pH and nutrient concentration than subsoil because of successive surface fertilization. 5. Growth status was negatively correlated with the concentration of nutrients in soil and leaf because of improper fertilization to have been applied at the same amount of fertilizer regardless of age or vigour of trees. 6. Deep soiling was the most excellent planting method to keep higher concentration of nutrients in leaves and to accelerate the growth of apple trees.
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