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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Grassland and Forage Science
Journal Basic Information
Journal DOI :
The Korean Society of Grassland and Forage Science
Editor in Chief :
Volume & Issues
Volume 7, Issue 3 - Sep 1987
Volume 7, Issue 2 - May 1987
Volume 7, Issue 1 - Jan 1987
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Studies on the Grassland Development in the Frest VII. Effect of shading degrees on the crop growth rate, net assimilation rate and photosynthtic active of main grasses
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 122~127
This experiment was carried out to investigate the effect of shading degrees (0:full sunlight, 25, 50 and 75%) on the crop growth rate (CGR), net assimilation rate (NAR) and photosynthetic activity of grasses for obtaining the basic data on the development, management and utilization of pasture in the forest. For the test, different artificial shading houses were established and pasture species used in this study were orchardgrass, timothy, perennial ryegrass and ladino clover. The experiment was performed at Livestock Experiment Station, Suwon, in 1984-'85. The results obtained are summarized as follows. 1. The highest CGR was obtained at 0% (full sunlight) and 25% of shading, followed by 50 and 75% of shading degrees, in that order. CGR of orchardgrass and perennial ryegrass were higher than those of timothy and ladino clover. 2. NAR was significantly decreased as the shading degrees increased. The highest NAR was observed at perennial ryegrass plot. 3. The photosynthetic activity during summer season was the highest at 25% of shading, followed by 50, 0 and 75% of shading degrees. While, the photosynthetic activity during fall season was the highest at 25% of shading, followed by 50, 0 and 75% of shading degrees, in that order. Those of orchardgrass and perennial ryegrass were remarkably higher than that of timothy. 4. A significant positive correlation was obtained in the relationship between CGR and NAR of main grasses, regardless of pasture species and investigated date.
Effects of Cutting on Nodule Development and Nitrogen Fixation in Alfalfa
Jong Won Ryoo ; Ho Jin Lee ;
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 128~134
This experiment was conducted to evaluate the effects of cutting in field and solution culture. Periodical samplings of alfalfa in cutting and uncutting plots were taken to measure nodule development and nodule activity. Regrowth of plant and nodule development after shoot cutting by different heights and nodule removal at different levels were investigated in solution culture of alfalfa plant. 1. Nodule weight in the field was reduced 30% after the first cutting and 25% after the second cutting, but during the following 30 days after second cutting, there was no significant difference between cutting and uncutting plots. 2. Specific nodule activities of cutting plots at the beginning of June and at the beginning of September were 80% and loo%, higher than those of uncutting plots respectively. Total nodule activities of cutting plots in late August and early September were 40% higher than those of uncutting plot. The decrease of nodule activity can be prevented by cutting at flowering stage. 3. The decrease of nodules in solution culture when 50% of the shoot was cut, was as much as that when shoot was not cut or flower buds were removered. But when 90% of the shoot was cut, the number of the nodules were decreased more remarkably than the above treatments. New nodules, when 90% of the shoot was cut, were reformed slowly and did not grow fully until 15 days after cutting.
A Comparison between Diploid and Tetraploid Cultivars of Lolium multiflorum Lam, italicum
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 135~139
The influence of ploidy level on agronomic characteristics in italian ryegrass, Lolium multiflorum Lam, italicum, was studied using diploids (2x) and tetraploids (4x) on the upland of Livestock Experiment Station, Suweon. The results are summarized as follow: 1. Tetraploid cultivars are in general dark green in leaf color and strong glittered. 2. Diploid cultivars are more resistant to cold than tetraploids but degree of resistance to cold depends on cultivars. The di-and tetraploids did not differ in summer survival and coldand heat resistance of di-Itetraploid cultivars were not related. 3. Tetraploid cultivars have larger leaf-blades, more rapid growth and higher leaf ratio to stem by heading than diploids. 4. Tetraploids possess significantly lower dry matter content than diploids. 5 . Fresh- and dry weight of tetraploids are similar with that of diploids but tetraploids are more leafy than diploids. 6. Seasonal yield depends more on the type of the cultivar than on its tetraploid nature.
Productivity of Silage Corn Hybrides in Rice Black-Streaked Dwarf Virus Prevalent Region
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 140~145
In 1985 and 1986, silage productivity of 8 Korean improved and 7 US introduced corn hybrids and their resistance to rice black-streaked dwarf virus (RBSDV) were tested in the southern part of Korea where RBSDV is prevalent. The results obtained are summarized as followes: 1. Percentage of RBSDV diseased plantes differed depending on the year and hybrid. Suweon 19, Kwangok, Hoengseungok, Jecheonok, Pioneer 3424, Pioneer 3H001, NC6 13 1 were most susceptible, Pioneer 3 160 and Pioneer 3358 were moderately susceptible, and Nampyungok, Suweon 90, Pioneer XCF38, PB 2, and Jinjuok were least suceptible. No hybrid was completely resistant to RBSDV. 2. There were negative correlations between percentage of RBSDV diseased plants and culm length, percentage of ear bearing plants, ear yield, silage yield, or digestible dry matter, but percentage of RBSDV diseased plants was not correlated with stover yield. 3. Silage yield of Jinjuok, Pioneer 3160, Pioneer 3358, and Pioneer XCF38 were higher than that of other hybrids in both years. However, digestible dry matter of Nampyungok, Suweon 89, and Suweon 90 were higher than that of other hybrids due to a higher proportion of ear in 1986 when RBSDV infection was severer.
Accumuation Pattern of Nitrate-Nitrogen in Sorghum And Maize Plants as Affected by Morphological Characteristics And Environmental Temperature
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 146~152
Sorghum cv. Pioneer 93 1, sorghum-sudangrass hybrid cv. Sioux and maize plant cv. Blizzard were assayed for toxic concentrations of nitrate-nitrogen (
-N) and their relationship to morphological characteristics and environmental temperature in a field and phytotron trial. In the phytotron, sorghum and maize plants ranging from emergence to heading stage, were grown under different day/night temperatures of 30125, 25/20,28/18 and 1818 degree C. Nitrate-nitrogen in sorghum and maize plants was accumulated mainly in stems. Therefore nitrate concentration in the young plants was increased as development of stalks advanced and was highest at the stage of 3-4 leaves, when the plants had a leaf weight ratio 0.78-0.80 g/g plant weight. However, nitrate concentrations of the plant decreased as morphological development progressed, especially from the stage of growing point differentiation. Correlation coefficients showed a positive correlation of nitrate concentration with leaf weight ratio, leaf area ratio and specific leaf area, while plant height, dry matter percentage and absolute growth rate showed a negative association with TEX>$NO_3$-N (
%). Cyanogenic glycosides, total nitrogen and crude protein were close associated with nitrate accumulation, and positively significant (
%). High temperature over 30/
for 3 weeks increased N-uptake and dry matter accumulation, but reduced nitrate concentration. Under cold temperature below 18/
concentration of nitrate-N was increased in spite of its limited nitrogen uptake and plant growth.
Study on the Quality of Whoie Crop Silage and Yield by Stage of Maturity of Rye Plant II. Quality of whole crop rye silage by stage of maturity
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 153~156
With a purpose of evaluation rye crop as winter green feed, a cultivar was sown in autumn and harvested at booting, heading, milk, dough and yellow-ripe stages, and processed into silage. The quality of the silage was assessed in terms of ammonia-N, recovery rate in dry matter, pH, and the composition of organic acids. The results obtained are: 1. The recovery rate in dry matter from the silage was the highest when harvested at yellow stage (P<0.01). The ratio of ammonia-N to total-N was low when the rye crop was harvested during milk (9.4%) and dough ( 12.7%) stages (P
. 3. Silage quality based on the composition of organic acids was highly evaluated when the crop was harvested during milk, and dough stages. 4. Considering both the DM yield and quality of the silage, it was found that rye crop should be harvested at dough stage and ensiled.
A Study on the Quality of Tuber silage of Jerusalem Artichoke ( Helianthus tuberosus L. )
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 157~161
In order to utilize the tuber of Jerusalem artichoke (Jerusalem tuberosus L.) which has been considered one of the most economical resources for bioenergy, the tubers of the plant were processed into silage in 11 lab-silo with three levels of mixture of concentrates i.e. 10, 20, 30%. The silage was stored for 20 to 40 days before analyses. The quality of silage was compared with those of the tube-only silage without concentrates. Aproximate composition, pH, ammonium nitrogen, total nitrogen, and organic acids were analyzed. The results obtained are summarized ; 1. With the mixture of concentrates, the water content of the silage was able to be adjusted to 70 percent and NDF significantly increased (P<0.05) while ADF significantly decreased. 2. The content of water-soluble carbohydrate (WSC) was significantly decreased in silages of the mixture of concentrate and the tuber (P<0.05), while total nitrogen and ammonium nitrogen increased. 3. Tube-only silage gave satisfaction in fermentation, particularly organic-acid fermentation. As the storage period extended, Flieg's score of the silage was improved. Conclusively, the tuber of Jerusalem artichoke found to satisfy the requirements of good silage and to be recommended as a good resource for all-inane silage provided the tuber was ensilaged with 20 to 30 percent concentrate.
Studies on the Quality of Silage from Domeestic Herbage I. Effects of water , corn starch and glucose as additives on Kudzu ( Puerarie thunbergii Bentham ) silage
Journal of The Korean Society of Grassland and Forage Science, volume 7, issue 3, 1987, Pages 162~167
This experiment was conducted to determine the effect of the feeding value for the wild legumes silage-making with additives. The chopped Kudzu (Puerarie thunbergii Bentham) of wild legumes was ensiled by the conventional method in the small experimental silo of 2 liters. The additives used in the present experiments were water (8%),water (8%) plus corn starch (3%) and water (8%) plus glucose (3%). These additives as well as that of control without additive were set up and these silage were compared with the conventional corn silage. The fermentative qualities and the characteristic of fiber (neutral detergent fiber, NDF; acid detergent fiber, ADF; acid detergent lignin, ADL) of silage produced was determined by chemical analysis, and dry matter digestibility (DMD) was evaluated by pepsin-cellulase technique. The results obtained are summarized as follows: 1 The weight of Kudzu silage was lost under the 10% for all the treatments. 2 In degree of pH for the Kudzu silages with glucose, starch, control and water treatments were high 3.80,4.04,4.57 and 5.34, respectively.