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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 25, Issue 4 - Dec 1980
Volume 25, Issue 3 - Sep 1980
Volume 25, Issue 2 - Jun 1980
Volume 25, Issue 1 - Mar 1980
Selecting the target year
A Study on the Changes in Grain Weight, Moisture Content, Shattering Force, Milling Ratio and Apparant Physical Quality of Rice with Harvesting Time
Yong-Woong Kwon ; Jin-Chul Shin ;
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 1~9
To determine the optimum harvest time of recent rice varieties from Indica/Japonica remote crosses, leading varieties Suweon 264 and Milyang 23 were tested for the changes in dry matter weight and moisture content of grain, shattering, shelling ratio, milling ratio, and apparant physical quality during grain development at 5 day-intervals from 20 days to 55 days after heading. The results are summarized as follows: 1. Grain weight (dry matter) reached its maximum (physiological maturity) at 30 days after flowering (DAF) in Suweon 264, and at 35 days in Milyang 23, and thereafter it did not change significantly until 55 DAF. 2. Time course of decrease in grain moisture content (Y, %) during maturation (X, DAF) consisted of two linear phases, i.e. a fast and a slow period: Y=68.245-1.33X until 34DAF, and Y=23.025-0.470X until 55DAF after 34DAF in Suweon 264; Y=73.62-1.634X until 24.5DAF, and Y=33.59-0.570X until 55DAF after 24.5DAF in Milyang 23. Two varieties showed the same grain moisture content of 28% (wet basis) at physiological maturity in spite of the distinct differences in the heading date, time of physiological maturity and thereby ripening climate. 3. Force to shatter a grain ranged about 90 to 100g in Milyang 23, and about 200 to 250g in Suweon 264 and in a Japonica variety, Jinheung. The force, however, did not change significantly with harvest time from 35DAF to 50DAF. 4. The changes in the ratios of shelling, milling, broken rice and tinted rice with harvest time were insignificant during a period from 35DAF to 55DAF. However, ratios of green rice and white belly rice decreased significantly with delay in harvest time during 10 days after physiological maturity. 5. The best time of harvest for maximum yield and good quality is thought to be 10 days after physiological maturity, and grain moisture content at this time was about 20% on wet basis.
Varietal Difference in Ecological and Morphological Characteristics Affecting Drought Tolerance
Rae-Kyung Park ;
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 10~16
Five of each lowland and upland rice varieties were planted in a seedling hox with three replications of randomized complete block design and it was desiccated up to complete water stress in certain leaf stage. The desiccated rice plants were supplied with water again to check survival ability of rice plant from wilting. All of the lowland varieties which showed lower yield in upland condition were superior to upland varieties in recovery ability from desiccation. Some of the morphological characteristics in relation to the recovery ability also were discussed.
Effect of Plant Spacing on the Competitive Ability of Rice Growing in Association with Various Weed Communities at Different Nitrogen Levels
S. C, Kim ; Keith, Moody ;
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 17~27
All types of weed community became dominant by Monochoria vaginalis (Burm.) Presl. as the nitrogen level increased. The importance value (IV.) of M vaginalis rapidly increased with increasing nitrogen level whereas the LV. of other weed species decreased. At the 10
10cm plant spacing, M. vaginalis was almost totally suppressed at all nitrogen levels. At the 20
20cm plant spacing, the degree of suppression declined with increasing nitrogen level. At the 30
30cm plant spacing, there was no suppression of M vaginalis at the highest nitrogen level. The yield obtained at the 10
10cm plant spacing when M. vaginalis was present was not significantly different from that obtained from the weed free plot for all rice cultivars while it was significantly reduced by M vaginalis competition at the 20
20cm and 30
30cm plant spacings. The difference in yield caused by M vaginalis competition was primarily due to a reduction in the number of panicles at all nitrogen levels. There was a high negative correlation between grain yield and weed weight at heading. The yield reduction due to weed competition varied depending upon the nitrogen level.
New Malting Barley Variety "Sacheon# 6"
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 28~37
New malting barley variety "Sacheon #6" is an early maturing, medium height, lodging resistance, high tillering, good quality and high yielding. This variety was developed from the cross Harupin-Nizo x Hokudai #2 made in 1970 at Sacheon Malting Barley Experiment Station, Doo San Farms Co., This variety was determined to recommend to the all malting barley production areas in southern part of Korea from 1979.from 1979.
Studies on the Procedures of Accelerating Generation Advancement in Wheat and Barley Breeding IV. Advancement of Two Generations of Wheat Materials a Year at Suweon by Growing a Summer Generation
Chang-Hwan Cho ; Byong-Hee Hong ;
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 35~42
To establish a generation acceleration technique, two crops a year at field condition of Suweon, 10 varieties different in their spring growth habit were tested with 6 different seeding time after harvesting. These materials were harvested on June 10, 19, 79 and tested for their seed production ability at varions seeding time from July I I to August 15 with a week interval. An immatured seed germination technique and green vernalization methods were applied in cycling generations and the results obtained were summarized as follows. 1. In summer growing, seedlings establishment after transplanting was better in earlier transplanting. 2. Heading time was remarkably enhanced by earlier transplanting. Considering the results of two years early or mid of July was the suitable time to plant the second summer crop. 3. Those varieties of spring growth habit expressed little variations in plant height among the varieties. In 1978 which is referred as warm year produced plant height as tall as 8-16cm and poor crop but produced good crop with 25-65cm plant height in 1979. 4. No definit tendency in the length of spike was. observed among the cultivars but longer spike was found in winter wheat compared to the spring. 5. Number of spikes per plant was ranged from 1 to 3 regardless the transplanting time in 1979. However, more spikes per plant were produced in early or mid of July transplanting and those varieties of higher growth habit than V did not produces any spikes. 6. Higher number of grains per spike was found at earlier transplanted varieties. Therefore, it is concluded that those materials of I-IV growth habit with mid or early July transplanting would be suitable in practical sense considering their ability of seed production. 7. Two-year results indicated that wheat crop can not tolerate the temperature level higher than average 32
C at Suweon. In this regard, the cultivation schedule was established assuming average temperature condition like the year of 1979 which was possible to grow wheats.
Yield and Malt Quality Responses of Two Malt Barley Cultivars to Application Levels of Nitrogen Fertilizer
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 43~58
The study was intended to know the responses of the nitrogen application levels (3, 6, 9, 12 and 15kg ai per
) to grain yield and quality of two-malting barley, Golden melon and Hyang maek in 1980. There was investigated chlorophyll content, dry weight, heading, grain yield, yield components, contents of protein, fat and carbohydrate and activity of
-amylase and invertase. Nitrogen increment was effective to increase of number of grains per spike and number of spikes per unit area, increase of protein content and decrease of
-amylase activity, but it was not recognized the yield increase under the 12% protein content.
Studies on Eeological characteristies of Some Soybean (Glycine max(L.) Merr) Cultivars 2. Effects of Day Length on Flowering and Other Agronomic Characteristics
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 59~65
An attempt was made to survey soybean cultivars that were nonsensitive to the photoperiod for selection as possible breeding materials for wide area adaptable varieties. Fifty-five cultivars were subjected to different day length conditions. The number of days from sowing until flowering was shortened under short day length conditions, and late varieties tended to be more sensitive to day length than early varieties. The response to day length of the tested cultivars might be divided into three groups; low, intermediate and high degree, by their accelerated rate of flowering. Especially four varieties in the low responding group, Gembokin, Wirth, Wayne and Pi.54613 were identified to be nonsensitive to day lengths, that is, neutral varieties. They also showed little variation in morphological characteristics under different day length conditions.
Differential Response of Soybean Cultivars to Alachlor, Linuron, and Metribuzin
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 66~72
Forth soybean (Glycine max (L.) Merr.) cultivars were evaluated to determine the extent of crop injury caused by differential sensitivity of cultivars to two rates of alachlor, linuron, and metribuzin. Most cultivars were relatively tolerant of alachlor at 120 and 240g/10a and also linuron at 62.5 and 125g/10a. However, many cultivars were highly sensitive to metribuzin at 50 and 100g/10a. Some of the most sensitive cultivars were ‘Kyungnam 2’, ‘Toyosuzu’, ‘Noki 1’, ‘Iwade 2’, and ‘Hampton’. Metribuzin also showed a very narrow margin of safety to soybean cultivars.
Studies on the Heterosis Breeding in Rapeseed Using Cytoplasmic Genic Male Sterility 4. The Effects of Improved Domestic Lines as Pollen Parents for Fertility Restoration, Maintenance of MS Lines and the Heterosis Expression in Economic Characters in
Jung-Il Lee ; ; Young-Am Chae ;
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 73~80
To facilitate the heterosis breeding which utilizes cytoplasmic-genetic male sterile lines in rape (Brassica napus L.), 511 improved domestic lines were tested for their fertility restoration, maintaining ability and heterosis expression in agronomic characters. About 81 % of 511 lines showed complete fertility restoration and 11 lines could be used as maintainer of male sterility. All yield components except pod length showed greater heterotic effects than that of midparent in
. These heterotic effects resulted in extraordinary yielding ability as high as 5.6 T/ha in several
Determination of the Optimum Time of Harvest in Winter Rape
Young-Am Chae ; Yong-Woong Kwon ;
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 81~85
Field experiment was conducted to determine the optimum harvesting time in winter rape (Brassica napus L.) by investigating the percent oil, 1, 000 seed weight, seed yield, dehiscent pod ratio and oil yield at 46, 50, 54, 58, 62, 66 and 70 days after flowering. Variation of all characters with days after flowering could be explained significantly by second degree polynomial equations. Percent oil and 1, 000 seed weight increased until 62 days after flowering and thereafter these traits decreased, while seed yield increased to 58 days after flowering and thereafter this trait decreased. This controversy was due to the drastic increase in dehiscent pods beyond 58 days after flowering which brought loss in seed yield. These results suggest that optimum harvesting time is 58 days after flowering and it should not be later than 60 days after flowering.
Studies on the Effect of Planting Time on the Flowering of Peanut (Arachis hypogaes L.)
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 86~90
To define the effect of planting time on the flowering of the peanut varieties, Cheonyup banlip and 9 other varieties were planted seven times at 15 day interval from April 15. The days to flowering of all peanut varieties were shortened proportionately with delayed planting time. The significant negative correlation (r =-0.86**) was recognized between the shortening rate of the days to flowering by later planting time and the days to flowering of peanuts planted at standard seeding time. The short day treatment did not have any effect on the chance of the days to flowering of each variety. A significant negative correlation was recognized between the number of flowers and the days to flowering of the peanut varieties planted at standard seeding time.
Studies on the Effect of Shading Materials on the Temperature, Light Intensity, Photosynthesis and. the Root Growth of the Korean Ginseng(Panax Ginseng C.A. Meyer)
Korean Journal of Crop Science, volume 25, issue 4, 1980, Pages 91~98
Three kinds of shading materials, styrol-foam board, pine board and polytex, were examined and compared with ordinary shading, and the effects of light intensity and the temperature under the shadings on the photosynthesis and the root growth of the Korean ginseng were studied to improve the shading on the ginseng field. The amounts of photosynthesis of the ginseng leaves at 2
were significantly larger than those at 3
in the same light intensity. At 2
, the maximum photosynthesis occured at 35, 000 lux, but at 3
, the amount of photosynthesis was rapidly reduced by higher light intensity over 26, 200 lux. The best root growth occurred under the polytex shading and the styrol-foam board shading was also effective for ginseng growth. Under the ordinary shading, the root growth of ginseng planted on rear line was very poor but under the styrol-foam or the polytex shading, the root growth showed little difference between the ginsengs planted on rear line and front line.