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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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KOREAN JOURNAL OF CROP SCIENCE
Journal Basic Information
Journal DOI :
The Korean Society of Crop Science
Editor in Chief :
Volume & Issues
Volume 26, Issue 4 - Dec 1981
Volume 26, Issue 3 - Sep 1981
Volume 26, Issue 2 - Jun 1981
Volume 26, Issue 1 - Mar 1981
Selecting the target year
Effect of Daylength on the Panicle Exsertion of Panicle Enclosing 'Gamadi' Rice Cultivar
G. L, Shrestha ; M. H, Heu ; S. Z, Park ;
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 121~124
The panicle enclosing Gamadi rice cultivar from western Tarai of Nepal was treated with different daylengths; 8 hours, natural daylength i.e. 14 hours 30 minutes to 12 hours 30 minutes, and 24 hours throughout its life cycle. The extremely long daylength of 24 hours induced the panicle exsertion, and elongated the first internode from the top, but did not affect the second internode significantly, suggesting that the panicle exsertion was strongly correlated with the first internode elongation in the Gamadi rice cultivar.
Influence of Transplanting Dates on Some Characteristics of Rice Varieties
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 125~136
This experiment was conducted to study the influence of different cultivation periods on some morphological and agronomic characteristics of rice plant at Iri, the Honam plain, in 1979. Early maturing varieties showed little delay in heading with late transplanting, but intermediate and late maturing varieties showed more than 7 day delay in heading. The number of days required to reach heading was over 55 and 67 days after transplanting in early and intermediate-late maturing varieties, respectively. There was significantly postitive correlation between the length of vegetative stage and the grain yield. The mean temperature during ripening period was significantly correlated with the grain yield and the percentage of filled grains. The length, width, and thickness of leaf increased with earlier transplanting and the elongation degree between upper and lower leaves showed the same tendency. The productivity of dry matter and the translocation rate of photosynthate to spikelet decreased with late transplanting mainly due to low temperature. LAI was also influenced by transplanting date showing close correlation with yield. Early transplanting was desirable for assimilation and dry matter accumulation.
The Influence of Temperature and Water Stress on the Varietal Reactions of Rice to the Inoculum of the Blast Infected Leaves (BIL)
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 137~145
Using the milled, blast infected leaves (BIL) as an inoculum source on the screening for the resistance to blast of rice plant was a simple and useful technique. The temperature with high (25^\circ C\sim 35^\circ C) and low (15^\circ C\sim 28^\circ C) and the water stressed or not, was conditioned of to the inoculation with the BIL to the test varieties in seedling stage. In low temperature, most of the varieties were more infected with blast, however the Indica-Japonica hybrids were more infected in high temperature conditions. The water stressed was more infected with blast than the not stressed. The interaction of variety with water stress was not so much as that of variety with temperature. Resistant reaction to blast (BIL) was not affected by the temperature and water stress, but the moderately resistant or susceptible one was much affected by them. Inoculum of BIL was virulent to the newly bred Indica-Japonica hybrid cultivars such as Tongil, Nopung, etc, but not virulent to the Japonica cultivars such as Nongbaek, Jinheung, etc. The discrete, mixed or variable lesions were observed mainly in the moderately resistant or susceptible cultivars such as Kanto 51, Yashiromochi, Ishikari-shiroke, etc.
Effect of Application Time and Rate of Diquat on Preharvest Field Drying of Rice
Yong-Woong Kwon ;
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 147~156
Most of the currently available rice threshers in Korea are of head-feeding type originally developed for threshing paddy at grain moisture content of 15 to 17% on wet basis. And prevailing rice harvesting system is swathing or cutting and bundling upright rice crop at a maturity stage of grain moisture content of ca. 28 to 20%, followed by transient natural drying in the field and threshing at grain moisture content of about 17%. The system often allows rather high field loss of rice both quantitatively and qualitatively. These necessitate use of a preharvest desiccant, and diquat has been registered recently as a rice desiccant. Aim of the present study is to determine the best time and rate of diquat application and to evaluate its utility as a rice desiccant under its optimal usage conditions in Korea. Diquat was not so effective for japonica rice varieties while it was very effective for the new varieties bred from indica x japonica crosses. The best time of application was the period from 2 days before to 3 days after physiological maturity of grain (moisture content of 28% w.b.) and the optimal rate was about 330g of diquat ion/ha. Applying diquat at the right time and rate dropped grain moisture to 15 to 16% (w.b.) within a week after treatment in contrast to that of 20 to 24% in untreated rice. Desiccation of rice crop with diquat resulted in 10 to 15% increase in grain resistance to shattering and significant reduction in percent green rice. However, there was no reduction in milled rice yield and percent whole kernel and was no change in the percent chalky rice and percent tinted rice. Diquat use appears highly desirable, if there is no residue problem which has not been studied in the present study.
Responses of Soybeans to Water Stress During Germination n. Water Uptake and Osmotic Potential of Soybeans During Germination
Y. W, Kim ; H. C, Minor ;
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 157~166
Laboratory experiements were conducted to evaluate water uptake and osmotic potential of soybean seeds associated with germinability. Bonus, Wayne, Essex and Pickett were selected for this study. Large and small seeds from the four varieties were included in water uptake measurements at
There were significant differences in water uptake during germination due to seed size and cultivars at optimum moisture condition, -6 and -15 bars soil moisture. As water stress increased, the water uptake of Pickett and Essex were superior to Bonus and Wayne, and small seeds were superior to large seeds. The seed moisture content at germination was 60.8% on a fresh weight basis under optimum moisture condition. The minimum moisture contents necessary for the germination were 50.2% at -6 bars and 50.9% at -15 bars. There were significant differences among varieties in seed osmotic potential during germination, although these differences depended on imbibition time. The average osmotic potential ranged from -32.0 bars after 4 hours imbibition to -11.2 bars at the beginning of germination. The correlation coefficient between seedling length and osmotic potential was not significant after any period of imbibition, suggesting that osmotic potential is not directly associated with seedling growth. However, osmotic potential is closely related to water uptake capacity of soybean seed.
Responses of Soybeans to Water Stress During Germination III. Respiration of Soybean Seeds During Imbibition
Y. W, Kim ; H. C, Minor ;
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 167~173
Respiration of whole seeds and seed parts isolated from four soybean varieties Essex, Pickett, Wayne and Bonus as measured at
during germination. The average respiration rates of cotyledons were significantly higher than those of other parts. The values were 35.7, 28.0 and 23.9 ul hr
for cotyledons, embyros, and hila, respectively. Bonus showed a significantly lower respiration rate than the other varieties did. The interaction of variety x seed part was not significant source of variation for respiration. This suggests that seed part and variety independently contribute to soybean seed respiration during early imbibition. The effects of imbibition time and time x variety intereaction on whole seed respiration were significant, but the variety effect was not significant. The correlation coefficient between seed moisture content and respiration after 24 hours of imbibition was significant for Bonus, but not for the other varieties tested. This suggests that Bonus may require more water for respiration during imbibition than the other varieties. There as no significant correlation of whole seed respiration rate after 24 hours imbibition with seed weight or seedling length.
Studies on the Agronomic Characteristics in the Winter Primary Octaploid Triticale
Sung-Ho Bea ; Chang-Hwan Cho ;
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 174~178
The experiment was dealt with an investigations on the agronomic potential of primary octraploid triticale in comparion with Chokwang, a major common wheat, local rye cultivar and new triticale selection Suweon #1 and Suweon #2. This octaploid triticale was originated from the cross of Jukoku #81 x Local rye cultivar. The results obtained were summarized as follows; Cold tolerance of the P-Tcl was better than those of the wheat cultivar Chokwang, triticale varieties Suweon #1 and Suweon #2, and comparable to local rye. Culm length of P-Tel was 113cm that was intermediate between the wheat and rye, and its culm thickness was thiner than the checks except the rye. Lateness of heading and maturing date of the P-Tel seemed to be over-dominant. However, flowering date after heading was 3 to 7 days earlier than the Suweon #1 and Suweon #2. Yield potential of the P-Tel was poor in comparision with the triticale cultivar Suweon #1 and Suweon #2 which was attributed to the low fertility and less number of the heads per squ are meter. If it was . improved the low fertility and less number of the valid tillers through the cross with the good secondary triticale it seemed to be an useful material for triticale breeding, expecially for improving cold tolerant winter triticale varieties in Korea.
Improvement of Herbicide Use in Crop Production w. Growth Responses of Soybean (Glycine max) Cultivars to Application Time of Metribuzin Herbicide
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 179~184
The study was conducted to know the differential growth responses of soybean cultivars as affected by various application stages of Metribuzin herbicide, at the University experimental farm of Chonnam Nat'l. Univ, Kwangjoo, 1980. Experimented soybean materials were six cultivars, as Kwanggyo, Dongbuktae, Bongui, Yukwoo 3, Suweon 85, and Suweon 86., . and Laid-out application stages were five as pre-sowing, Pre-emergence, Early Post-emergence, and Late Post-emergence treatment comparing with Control. Results obtained from the study were as follows: Among experimented soybean cultivars, no significantly tolerant cultivar was shown. Highly significant differences in phytotoxicities by Metribuzin treatments were detected among various application stages, and crop tolerances were recognized bigger in order as E. Post-emg. < L. Post-emg.
Pre-emg. < Pre-sowing
Control. The phytotoxic symptoms of all soybean cuitivars were severely recorded in order of Leaf No. /Plant < Plant height
Branch No. /Plant. For the cultivation of most soybean cuitivars, the use of Metribuzin in Pre-sowing or Pre-emergence were recommended, and especially it is expected to follow of more detailed study on soil-incorporation method in Pre-sowing treatment, and rather the tank-mixture system of Metribuzin with others than the mono-application system for the safe-use and enlargement of weeding-spectrum.
Growth Stages of Maize (Zea mays, L.)
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 185~191
The purpose of this paper is to define and describe a series of growth stages for maize. cv. MTC-l (early) and Suweon No. 19 (late) that are easily identifiable by both professional agronomists and farmers. Plants were grown at a density of 60cm row with plant spacing of 15cm at six different seeding times in 1980. Leaf development indices with ten grades (LDI) were identified and defined in accordance with the development of a leaf blade. Leaf appearance rate (LAR) was ca. 3 days and it was not influenced by the variety or seeding time. The elongation of the first internode above the ground level began in a month after emergence and it corresponded to the 8th or 9th leaf stage. Internodes elongated in regular sequence of node position. The morphological change of silks related closely with the development of kernel. The duration of generative development was not influenced by varieties and seeding time but that of vegetative growth was influenced. A new scheme for the maize which was made by the developed leaves, visible nodes above ground level, morphological change of silks and development of kernel was proposed.
Effects of Seed Inoculation Methods on the Nodulation and the Growth of Alfalfa Seeding
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 192~197
Alfalfa (Medicago sativa L. cv. Luna) seeded in agar was inoculated with two strains of Rhizobium meliloti isolated from root nodules of alfalfa for assessment of nodulation. The seedling growth after six weeks was remarkably increased by adding each rhizobia strains into agar media and also by nitrate application (70ug N/ml), but there was no significant difference among them. Nodulations started one week after inoculation and increased its numbers and sizes as seedling grew. Therefore, the two strains isolated from alfalfa root were concluded to be effective strains. For determining seed inoculation method the same cultivar was inoculated with both rhizobia strains using different inoculation methods such as broth-vacuum, peat-adhesive, peat & lime pelleting. They were seeded in pots of river sand and supplied with culture solution excluded nitrogen. The peat & lime pelleting was recognized the best method in both of nodulation and seedling growth after eight weeks growth. There were significant correlations between the weight of nodules and the shoot or root dry weight of alfalfa in both rhizobia strains.
Effects of Seed InocuJation of Rhizobium meliloti and Lime Application on the Early Growth of Alfalfa (Medicago sativa L. cv. Luna) in an Acid Soil
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 198~206
A field research was conducted to evaluate the effects of inoculation of Rhizobium meliloti and lime application on the early growth of alfalfa, var. Luna, in an acid soil. Alfalfa seeds were inoculated by lime-peat pelleting method with
strain isolated from alfalfa roots. Both inoculated and noninoculated seeds were sown in acid soil (pH 5.5) with three levels of lime application (1, 3, 6 ton/ha) on mid-April. Inoculated seeds produced many effective nodules in early stage and increased nitrogen and chlorophyll contents of leaf, consequently stimulating alfalfa growth. Pseudo nodules were found in noninoculated, while they were seldom formed in inoculated. Lime application increased soil pH, plant height, root length, and shoot and root weight. Liming effect on nodulation was significant at first cut, but no longer after then. Both inoculation and liming increased the forage yield of alfalfa. Inoculation and liming of 6 ton/ha together produced the highest yield. As compared to control plot of nitrogen application, the effect of seed inoculation only could be equal to about 120 kg/ha nitrogen application. The total nitrogen contents of forage were little affected by number or weight of nodules and amounts of lime application.
Effect of Plant Population on the Growth, Yield and Quality of Sohyang (Nicotiana tabaccum L.)
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 207~211
The effect of plant populations - 16,667, 14,285, 12,499 or 10,7l4/10a on the agronomic characteristics of an aromatic tobacco, Sohyang was investigated for two years. The growth and number of suckers produced decreased as the population increased. The leaf area index (L.A.I) was higher in thinner planting, but there was no significant difference in weight per unit leaf area between treatments. Yield was highest, 1 24 kg/ l0a, in 16,667 plantings per l0a, but quality was not different among densitites tested. Similar trends were observed in monetary value per l0a. Concentrations of total alkaloids and nitrogen were low in denser planting, but no significant difference was observed in total sugar. The results suggest that about 16,000/10a more would be optimum number of plants for Sohyang.
Effects of Plant Spacing on Light Environment, Yield and Quality of Burley Tobacco
KOREAN JOURNAL OF CROP SCIENCE, volume 26, issue 2, 1981, Pages 212~217
The evaluate the effect of plant spacing on cured leaf of burley tobacco, the row spacings divided to 90, 105, 120cm and hill spacings to 30, 35, 40cm within each row. Growth amount per plant increased with thinner row and wider hill spacing in the same planting density. Relative light intensity increased with thinner row spacing in cutters and leaf and showed the positive correlation with quality. When the planting density was equal, the wider hill spacings, the more effective in utillization of solar radiation. The more plants per l0a were, the greater yield was obtained, and in the case of 3,200 plants per l0a (the most dense planting plot) was 267kg. But, quality, total-alkaloid and total-nitrogen content decreased with dense planting. Value per l0a was highest in the plots of 90
40cm and 105 \ times 40cm. In conclusion the optimum density level was 2,400 to 2,700 plants per l0a and spacing of tobacco either in 105
35 cm or 105
40cm seems to be most appropriate.