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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Crop Science
Journal Basic Information
Journal DOI :
The Korean Society of Crop Science
Editor in Chief :
Volume & Issues
Volume 35, Issue 6 - Dec 1990
Volume 35, Issue 5 - Oct 1990
Volume 35, Issue 4 - Aug 1990
Volume 35, Issue 3 - Jun 1990
Volume 35, Issue 2 - Apr 1990
Volume 35, Issue 1 - Feb 1990
Selecting the target year
Relationship between Lodging and Agronomic Characters of Soybean Plant
Dong-Woo Lee ;
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 289~294
This study was carried out to investigate the lodging patterns and the direct and indirect effects of several agronomic characters upon lodging of soybean plants. Most of the lodged plants had bent main stem above first stem node at higher plant density. Lodging was significantly correlated with plant height, internode length and shoot fresh weight in two soybean cultivars, Paldalkong and Jangyeobkong. Root fresh weight was also significantly correlated with lodging in Paldalkong, Jangyeobkong and Kwangkyo. Length of internode showed the greatest direct effect on lodging in Paldalkong and Jangyeobkong.
Influence of Drought Period in Different Growth Stage on Agronomic Characters in Sesame
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 295~303
In this study, drought period when important agronomic characters of sesame plant is critical, was examined at different growth stages. Plant death by drought started at 40 days after drought in vegetative growth stage and 20 days, in reproductive growth stage. Obserbed by growth stage, drought damage in reproductive growth stage was more in jurious than vegetative growth stage. All the important agronomic characters was refreshed until 40 days and 20 days after drought in vegetative growth stage and reproductive growth stage respectively, but it could berefreshed after those times. Decrease rate of yield by drought ranged from 29 to 80% in vegetative growth stage and from 49 to 85% in respective growth stage. All the important agronomic characters except rate of ripeness showed positive association with grain yield under drought condition. Oil content in grain was decreaced by drought but composition of fatty acid was not affected by it.
Effects of Pinching and Application of Mg, B and Zn on Growth and Yield of Sesame
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 304~308
This study was conducted to increase the yield of sesame on the undeveloped upland by pinching and application of minor nutrients which were magnesium. boron and zinc. The effect of phinching to yield at 20 days after germination was 17%. and pinching effect at 50 days after germination with minor nutrients was 46% compared to non-treatments. These effect were considered as increasing the number of capsule per plant. number of node per main stem. and 1,000 grains weight. Simultaneously, the nutrients (Mg. B and Zn) were recognized to promote remarkably the yield.
Effect of Chemicals on Inducing Grain Sterility of Rice
Song, Moon-Tae ; Kim, Jeung-Kyo ; Choe, Zhin-Ryong ;
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 309~314
A pot experiment was carried out to find the effects of chemicals and its application time on the sterility and other agronomic characters of rice. Two rice cultivars, Samgangbyeo, a Tongil type, and Chuchungbyeo, a japonica type rice were treated with maleic hydrazide (6000ppm), ethephon (6000ppm) and GA3 (10ppm) at five different growth stages. The application times of chemicals were comprised of two different stages of stem elongation and booting and panicle emerging stage. Grain sterility and panicle length were measured for panicles per pot. Culm length was measured for pot basis. MH induced complete grain sterility in rice, but caused severe plant damage (phytotoxicity) ; restricted spike emergence and drying out of plant leaves, sheath and panicles. Ethephon induced 50-60% grain sterility in rice with the least in plant damage. GA3 was not effective in inducing grain sterility in rice, but it increased culm length. The earlier application of chemicals, the higher sterility was induced. Both MH and ethephon reduced culm length and grain yield. Also observed was the varietal response in the occurrence of to chemicals Samgangbyeo showed the higher response to chemicals than Chuchungbyeo.
Growth and Yield as Affected by Vinyl Mulching and Sowing Time in Cassia tora L.
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 315~319
In order to determine the optimum sowing date of Cassia tora L., ecological characters, components and yield were investigated under vinyl-mulching and non-mulching condition. Emergence date and maturation date of vinyl-mulching condition were earlier than those of non-mulching condition. especially with maturation date being about 30 days earlier, Under vinyl-mulching condition, length of stem and pod were longer, number of branches, pods and seeds per plant were increased, stem diameter was thicker, and weight of 1000 grains was heavier. Seed yield per 10a under vinyl-mulching was twice as high as that of non-nulching condition. As sowing date was delayed, the maturation date was progressively delayed. At sowing date of April 10, plants showed the longest in length of stem and pod, the largest in number of pods per plant and number of grains per pod, and the highest in weight of 1000 grains and seed yield. Judging from the results, optimum sowing of Cassia tora L. appeared to be April 10.
Effects of Seeding Methods, Dates and Rates on Grain Yield in Direct Seeding of Rice with Transplanter
Kwang-Ho Kim ;
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 320~327
Experiments were conducted to investigate the method to raise seedling establishment rate and the optimum seeding dates and rates in direct seeding culture using transplanter under submerged field condition in Chuncheon area during 1986 to 1988. Direct seeding on submerged field using transplanting machine after sowing on seedling growing box contained with paddy or upland soil was possible. Higher rate of seedling establishment was obtained in case of sowing sprouted seed and intermittent irrigation after sowing. Seedling establishment rate was higher both in April 30 or May 10 seeding plot. Minimum daily average air and soil temperature to ensure more than 70 percent seedling establishment was 14.8
respectively. Optimum sowing date in the direct sowing was early May and optimum sowing rate was 200g per box, 6kg per l0a. In this case rice grain yield was 481kg per l0a and this is almost same yield level compared hand and machine transplanting.
Quantitative Analysis of Dry Matter Production and its Partition in Rice III. Partitioning of Dry Matter Affected by Planting Density
Dong-Sam Cho ;
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 328~333
In developing dynamic growth model of a crop, it is important to estimate accurate dry matter partition to different parts of crop plants. Two rice varieties, Samkang and Chucheong, were transnplanted with three planting densities of 72. 90 and 120 hills per 3.3㎡ on May 30 and June 15 in 1988 to study the effect of planting density on dry matter partition in rice plants. Total dry wight per square meter of two varieteis in May 30 transplanting were greater than those in June 15 transplanting. Total dry wights were increased as planting density was increased. The response of dry weights of differents parts of rice plants per hill were decreased as the density was increased. Although the difference in dry weights of leaf blade and stem and sheath between two varieties was not great, greater ear weight of Samkang resulted in greater total dry weight than that of Chucheong. Despite of transplant in date and planting density on dry weights, the ratio of dry matter partition to different parts of rice plants at a certain growth stage remained constant. Estimated dry weights of different parts at two stages of growth based on average ratio of dry matter partition over two transplantion dates and planting densities agreed well with those observed.
Electrophoretic Variations in Protein and Some Enzymes during Stratification of Panax ginseng Seeds
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 334~341
The electrophoretic variations in protein and some enzymes during stratification of Panax ginsseng seeds were checked in relation to the differentiation and development of immature embryo, Seed-protein on PAGE showed eight major bands during the period of investigation, Four bands of Rf : 0.12, 0.24, 0.66 and 0,72 remained in dark stained condition, whereas the remainders (Rf : 0.40, 0.48, 0.56 and 0,76) became lighter in the staining condition as the treatment period was prolonged, In embryo, which was separately sampled from 75 days after the treatement, the only band of Rf 0.76 was not observed, In peroxidase, the number of bands was gradually increased and came to four bands at 45 days after treatment, and their staining color became gradually darker until the time of final samling. Also, the embryo had the same patterns as those in the intact seed. Esterase showed four bands during the period of investigation. As the treatment period was prolonged, the degree of staining condition came to darker in the band of Rf 0.36, but lighter in the band of Rf 0.56. The band of Rf 0.20 was not detected in the intact seed at 90 days after the treatment, but clearly observed in embryo. Glutamate dehydrogenase had only two bands: one (Rf : 0.16) was detected only at 60 days after the treatment and the other (Rf: 0.14) was always observed throughout the period, and showing simple pattern in the electrophoretic variation. Glutamate-oxaloacetate transaminase showed the only band of Rf 0.36 during the period of investigation and even in embryo, and showing the simplest pattern, indeed.
Effect of Cultural Methods on Seed Production in Summer Type Soybeen
Kwang-Ho Kim ;
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 342~351
Experiments were conducted to find out the possibilities of producing good quality seed of summer type soybean at Chuncheon, 74m above sea level and Jinboo, 600m above sea level in 1987. Local variety, Cheonan Jaelae was used. Seeds were sown June 25 harvested five times from 35 days after flowering with five days interval to 55 days. Vegetative period was longer in the early planting and high cool area, Jinboo, which resulted longer stem length than the late planting and in the plain area, Chuncheon. Pod number and 100 grain weight were shown more and heavier in Jinboo. Earlier planting and later harvesting resulted more pod number and heaveier 100grain weight. Grain yield was heigher in Jinboo, and earlier plainting shown more grain yield and its difference was greater in Jinboo. Long grain filling duration resulted more grain yield. Unripened seeds were produced more by earlier planting with earlier harvesting and earlier planting with late harvesting showed the high rates of pod and stem blight (Diaporthe Phaseolorum). Seed With high moisture content by early harvesting showed more rotten seeds in all planting dates production was more advantageous in the high cool area, Jinboo. Optimum planting date was between May 15 and June 5. Harvesting was desirable about 45-50 days after flowering with heigher germination rate seed yield.
Effect of Different Wind-break Net on Reducing Damage of Cold Sea Wind
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 352~361
The reducing effect of wind injury was investigated using several wind-break nets in Youngdeok province where cold-wind damage is often occurred during rice growing season. The white-head damage of rice have been often occurred by typhoon during the period between August 15 to September 10 in the cold wind area of the eastern coastal during the last 11 years (1979-1989). This may suggest that the critical period for heading will be by August 15 in the regions. High evaporation coefficient, more than 250 due to typhoon passage over the regions resulted high injury of white head. Generally, the wind injury have been caused by warm and dry westerlies through Fohn apperance in Taebaeg mountains and by cool-humid wind which blows from coast to inland. The frequency of occurrence of the two types of typhoons were 25, 20%, respectively during rice cultivation. The instalation of wind-break net significantly reduced the wind blowing speed, depending on the net mesher with the higher effect in dence net. The distances between the net and cropping area also affect the wind speed: 23% reduction at 1m distance. 34% at 10m and 28% at 20m, respectively. The reducing effect was also observed even at 10 times height of the wind-break net. The instalation of wind-break net gave several effects on climate factor, showing that temperature increased by 0.8
(average) : water temperatures increased by 0.5
(average) : soil temperature increased 0.4
. The earlier heading and increasing growth rate, use of light, culm length, panicle number per hill, spikelet number per panicle, fertility and 1,000 grain weight were observed in the fields with the wind-break nets resulting in 10-15% increase in rice yield using 0.5
0.5cm nets. The increasing seedlings per hill gave higher grain yield by 13% in the cold wind damage regions of eastern coastals. and the wind-break was more significant in the field without the wind-break net. Wind injury of rice plant in the cold wind regions of eastern coastals in korea could be reduced by selection of tolerant varieties to wind injury, adjustment of transplanting time, and establishment of wind-break nets.
Photosynthesis and Respiration of Forage Plants under Saline Stress
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 362~369
In order to determine the mechanism of saline stress, forage plants were irrigated with sea water. Saline stress was investigated on photosynthesis, root respiration, evapotranspiration and visual symptoms. All crops showed increased relative evapotranspiration and relative photosynthesis under low temperature (11-16
) rather than high temperature (22-24
). The correlation coefficients calculated for each crop between relative evapotranspiration and root respiration were 0.996
**/ for orchard grass, 0.828
*/ for alfalfa and 0.963
**/ for white clover. No significant correlation coefficient between relative evapotranspiration and root repiration was found for the tall fescue. The effects of OED spray on the evapotranspiration and root respiration of crops in the sea watered pots were low compared with those in the fresh watered pots. When OED was sprayed and zeolite was used, the evapotranspiration and root respiration were low compared with check pots and sand pots. The root damage due to sea water treatment was characterized by brown colored root cortex in orchard grass and tall fescue, and water penetration of root cortex in alfalfa and white clover.
Influence of Rice Water Weevil (Lissorhoptrus oryzophilus) Damage on Growth and Grain Quality in Rice
Korean Journal of Crop Science, volume 35, issue 4, 1990, Pages 370~374
A field experiment was conducted to investigate the influence of water weevil damage on growth and grain guality in rice. Plant height was shortened, number of tillers per hill decreased and maximum tillering stage delayed in damaged field by rice water weevil. Heading date was delayed by 1-2days, culm lenght shortened, panicle lengthened, number of panicles decreaced, number of panicles per spikelet increased, ripened grain ratio decreased in damaged field by rice water weevil. Yield per 10a was decreased 4-22% in damaged field compared with that in undamaged field by rice water weevil, yield loss in late transplanting (June 23) was larger than that in early transplanting (May 20). Imperfect kerml rice, especially green kernel rice, was increased in damaged field by rice water weevil.