• Product Safety
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• s.109
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• pp.82-84
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• 2003

• Product Safety
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• s.110
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• pp.72-76
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• 2003

• Product Safety
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• s.111
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• pp.60-64
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• 2003

• Korean Journal of Environmental Biology
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• v.19 no.4
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• pp.270-277
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• 2001

To observe the stimulating effect of low dose ${\gamma}$ radiation on the dormancy breaking and growth, microtubers induced in vitro of two potato (Solanum tuberosum L. cv. Dejima and cv. Superior) cultivars with different storage duration were irradiated with ${\gamma}$ radiation at the dose of $0.5{\sim}30$ Gy. Sprouting rate, growth and tuber yield of ‘Dejima’ microtuber were increased by ${\gamma}$ radiation in the range of $2{\sim}16$ Gy. In the microtuber of ‘Superior’, the sprouting rate was promoted by 2 Gy and 4 Gy irradiation, and the growth and tuber yield by 0.5 Gy and 4 Gy irradiation. There were not that much difference in chlorophyll content of potato plantlet by the low dose ${\gamma}$ irradiation. These results suggested that low dose ${\gamma}$ radiation stimulated the dormancy breaking and potato growth.

• Journal of Korean Society of Forest Science
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• v.21 no.1
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• pp.35-38
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• 1974

In order to investigate reproductive capacity of genus Lespedeza 5 spp,; L. bicolor, L. maximowiczii, L. japonica var. intermedia, L. angustifolioides, and L, cyrtobotrya, their hights, diameter at the ground level, and the number of sprouts were compared with each other at the end of October during investigating years from 1970 to 1972. For measuring of invested items, 6 stocks which the one-year aged stem were cut above ground were randomly planted per square meter with six replications at the spring of 1970. After hights, diameter, and the number of sprouts were measured at the end of October every year, the stem were cut above ground at the end of November from 1970 to 1972. The results are as follows: 1. The reproductive of the stems showed statistically significant differences at 1% level by species and stock ages. L. bicolor showed the best reproductive capacity of them. 2. The sprouting ability was revealed that L. maximowiczii showed the best of them. 3. The reproductive capacity of stem, diameter, and number of sprouts increased with aging of stock up to 4 years on the investigated 5 species.

• Korean Journal of Weed Science
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• v.14 no.1
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• pp.49-55
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• 1994

A study was conducted to determine the effect of depth of burial, soil temperature and/or moisture on tuber sprouting of E, kuroguwai. Tubers were evenly distributed in the upper 30cm of soil. Tuber weight increased as depth of tuber formed increased. No dormancy in newly formed tubers was found, whereas mature tubers were dormant. When new tubers were subjected both to continuous $5^{\circ}C$ and to gradual decreasing temperatures regimes ranged from 20 to $1^{\circ}C$ for 30 days, the tubers remained non-dormant. Viability of tubers was reduced when buried at 5cm depth in dry and moist soil conditions, but no reduction was obtained when buried at 25cm depth, regardless of soil moisture conditions employed. Percent sprouting of tubers buried at 25cm depth increased with increasing duration of burial in three soil moisture conditions studied, wherease in dry and moist conditions percent sprouting of tubers buried at 25cm depth increased by 60-day burial and thereafter decreased. In submerged condition, tuber sprouting was greater when buried at 5cm depth than when buried at 25cm depth, and increased as duration of burial increased at the both depths.

• Current Research on Agriculture and Life Sciences
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• v.20
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• pp.71-76
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• 2002

The one year old persimmon twigs were collected to know cold tolerance at different temperatures. The selected persimmon cultivar were mast commonly growing in southern part of Korea, such as Bong-Ok, Chungdo-Bansi, Naju-Pasi and Kiwonbang growing at attached farm of Kyungpook Nat. Univ. Browning of bud was the most significant at $-15^{\circ}C$. Naju-Pasi showed no difference in damage between $-5^{\circ}C$ and $-15^{\circ}C$ so called, it is cold tolerant cultivar. Browning of the woody part showed the same tendency with the bud at $-15^{\circ}C$. Chungdo-Bansi was shown the mast weak in cold tolerance than the other cultivars. Electric conductivity was higher at $-15^{\circ}C$ in all persimmon cultivars. Naju-Pasi and Bong-Ok cultivars were weak in cold tolerance even at $-10^{\circ}C$. Bud bursting was occurred at $-15^{\circ}C$ but few on another twigs tested. Naju-Pasi was the lowest while Kiwonbang was higher in the bud bursting. From these result, Naju-Pasi and Bong-ok cultivars were lower in cold tolerance. Kiwonbang cultivar was shown cold tolerance than the other cultivars. These results can be utilized for the persimmon cultivation at different localities in future.

• Journal of Korean Society of Forest Science
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• v.83 no.2
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• pp.148-154
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• 1994

As a vegetative propagation method for ash species, which is a dioecism and a long cycle of fructification, cut-stem was soaked in water to induce adventitious sprouts, and 2-year-old ash seedling was cut in a nursery to induce adventitious sprouts. We obtained the 1,019 adventitious sprouts from branches of 101 plus trees througout the country. The mean ortet-age is 48. There is not a correlation between ortet ages and production of adventitious sprouts. These sprouts were placed in a cutting bed for rooting. Root ability varied with environmental factors of cuttings. The best rooting(87%) resulted from cutting performed in a vinyl-plastic greenhouse. Rooting was better on perlite+peat moss(2 : 1) medium than other media tested. The rooting ability was generally higher in 2-year-old ortet than plus tree ortet. In the root development of cuttings the non-container cuttings was better than container cuttings.

• Korean Journal of Environmental Agriculture
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• v.20 no.2
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• pp.116-121
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• 2001

To observe the stimulating effects of low dose ${\gamma}$ - radiation on the dormancy breaking and physiological activity, potato (Solanum tuberosum L. cv. Dejima) were irradiated at the dose of $0.5{\sim}30$ Gy. Low dose ${\gamma}$ - radiation exhibited promoting effects on the sprouting rate within the range of optimum dose of 1 Gy and 2 Gy and on the sprout length within the range of optimum dose of 2 Gy and 4 Gy. Regardless of storage duration and irradiation doses, the number of sprouts was enhanced. The number of sprouts, which were reserved for 15 days after production (DAP), were significantly increased under 4, 8 and 16 Gy irradiation. The growth of 45 DAP sprouts was extremely stimulated under 4 Gy irradiation accompanying the increase of peroxidase activity in the plantlet. In this study, it was also suggested that the activities of antioxidative enzymes of potato plantlets were not related to the irradiation dose during the plantlet development with the exception of decrease in catalase activity.

• Proceedings of the Korean Society of Crop Science Conference
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• 1977.05a
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• pp.28.1-28.1
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• 1977