• Asian-Australasian Journal of Animal Sciences
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• v.4 no.3
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• pp.245-250
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• 1991

Analysis of the characteristics and the grouping of the species of sown and weeds in artificial pastures was studied applying the principal component analysis method. Presency and coverage of six sown species and fifteen weed species which occurred in pastures of under-grazing and optimumgrazing were subject to analysis. From field survey, species were divided into three groups: the group A included five species such as Festuca arundinacea, Lolium perenne and Dactylis glomerata, etc., the group B included eleven species such as Polygonum longisetum, Agrostis alba and Rumex obtusifolius, etc., and the group C included five species such as Miscanthus sinensis, Rubus palmatus and Artemisia princeps, etc. The group A species corresponded to good pasture conditions and management. On the contrary, the group C species occurred in poor pasture conditions with inadequate management. The group B species corresponded to intermediate pasture conditions and management. Interrelated pair species co-existing and species non-co-existing were discovered. Factor loading as negative for the group A species. positive for the group C species and positive but lower than the group C species for the group B species. From these results it is concluded that the principal component analysis seems to one of the useful tools for the analysis of characteristics of species and the diagnosis of sown pasture vegetation, although further studies are required to get more general information about species characteristics.

• Magazine of the Korean Society of Agricultural Engineers
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• v.45 no.7
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• pp.83-93
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• 2003

This research compared the observed and model predicted results that include; runoff, sediment yield, and nutrient losses from a 2.71 ha cattle grazing pasture field in North Alabama. Application of water quality computer simulation models can inexpensively and quickly assess the impact of pasture management practices on water quality. AGNPS single storm based model was applied to the three pasture species; Bermudagrass, fescue, and Ryegrass. While comparing model predicted results with observed data, it showed that model can reasonably predict the runoff, sediment yield and nutrient losses from the watershed. Over-prediction and under-prediction by the model occurred during very high and low rainfall events, respectively. The study concluded that AGNPS model can be reasonably applied to assess the impacts of pasture management practices and chicken litter application on water quality.

• Journal of The Korean Society of Grassland and Forage Science
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• v.11 no.1
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• pp.28-28
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• 1991

The investigation of the kinds and density of white grubs in relation to soil texture, forages, yearsafter pasture establishment, and management methods in pasture were surveyed in Livestock ExperimentStation, Suwon by digging 5 sites($100cm{\times}100cm$) in a month from April to October during 1985.The results obtained were summarized as follows; No difference was observed in white grub speciesdivesity in relation to soil texture, forages, years after pasture establishment, and management methodof pasture, but the abundance of each species was different from the environmental factors.1. On the soil texture; Miridiba kureana, Popillia uchidai, Holotrichia mmosa and Holotrichia diomphalia occurred in the clay loam field, whereas Anomala corpulenta and Anomala mfocuprea in the sandy loam. 2. On the forage; the density of all species except Popillia uchidai was higher in grass than legume. 3. On the years after pasture extablishment; both of the species diversity and abundance were increased 3 years after pasture establishment and maximized at the 5th year.4. On the management methods of pasture; species diversity and abundance were higher in meadows thanpastures.

• Journal of The Korean Society of Grassland and Forage Science
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• v.11 no.1
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• pp.38-42
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• 1991

The investigation of the kinds and density of white grubs in relation to soil texture, forages, years after pasture establishment, and management methods in pasture were surveyed in Livestock Experiment Station, Suwon by digging 5 sites($100cm{\times}100cm$) in a month from April to October during 1985. The results obtained were summarized as follows; No difference was observed in white grub species divesity in relation to soil texture, forages, years after pasture establishment, and management method of pasture, but the abundance of each species was different from the environmental factors.1. On the soil texture; Miridiba kureana, Popillia uchidai, Holotrichia mmosa and Holotrichia diomphalia occurred in the clay loam field, whereas Anomala corpulenta and Anomala mfocuprea in the sandy loam. 2. On the forage; the density of all species except Popillia uchidai was higher in grass than legume. 3. On the years after pasture extablishment; both of the species diversity and abundance were increased 3 years after pasture establishment and maximized at the 5th year.4. On the management methods of pasture; species diversity and abundance were higher in meadows than pastures.

• Journal of The Korean Society of Grassland and Forage Science
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• v.18 no.4
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• pp.337-344
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• 1998

This study was conducted to find out the vegetational succession in abandoned hilly pasture, in Yeoju, Kyonggi Province from April, 1993 to October, 1996. The experiment was arranged as vegetation survey (Pflanzenaufuahme) with two different pastures((1) with forkcrane planed pasture and (2) forest pasture). After the abandoned management of pasture, the botanical composition of planed pasture and forest pasture was greatly changed into the type of natural vegetation in the first year and in the second years, respectively. The biomass of life forms of hemicryptophytes, geophytes and chamaephytes was greatly decreased, on the other hand, that of therophytes and nanophanerophytes after abandoned management of planed and forest pasture in three years was slightly increased than those of the vegetation with pasture management. The similarity coefficients among vegetation groups during the survey were greatly affected by botanical composition. The clustering analysis was showed that the communities of relatively similar botanical composition were grouped closely, and the other communities were clustered farther to the same group although the degree of similarity between communities was low. The communities of hilly pasture after abandoned management were gradually successive into the type of natural grassland or forest community in three years.

• Journal of The Korean Society of Grassland and Forage Science
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• v.18 no.4
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• pp.329-336
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• 1998

This study was conducted to find out the changes of the botanical composition, ecological behaviour and forage value of vegetation in abandoned hilly pasture, in Yeoju, Kyonggi Province from April, 1993 to October, 1996. This experiment was arranged as a vegetation survey(Pflanzenaufnahme) with two different pastures ((1) with forkcrane planed pasture and (2) forest pasture). After the abandoned management of pasture, wild grasses and shrubs of the botanical composition were gradually increased and pasture plants tended to decrease rapidly in the two different hilly pasture. In abandoned management of planed and forest pasture, moisture figure, reaction figure and nitrogen figure of the ecological behaviour were greatly decreased and also the forage value of standing crop was greatly decreased in three years (from 7.06 to 4.60 in planed pasture and from 6.81 to 4.38 in forest pasture). After abandon of two different hilly pastures, fresh weight of standing crops in flowering stage was greatly decreased 48.5~54.1% in three years than that of the vegetation at the pasture management.

• Journal of The Korean Society of Grassland and Forage Science
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• v.35 no.3
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• pp.225-231
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• 2015

Improving current pasture productivity by precision management requires practical tools to collect site specific pasture biomass data. Recent developments in unmanned aerial vehicle (UAV) technology provide cost effective and real time applications for site specific data collection. For the mapping of herbage biomass (BM) on a hill pasture, we tested a UAV system with digital cameras (visible and near-infrared (NIR) camera). The field measurements were conducted on the grazing hill pasture at Hanwoo Improvement Office, Seosan City, Chungcheongnam-do Province, Korea on May 17 and June 27, 2014. Plant samples were obtained from 28 sites. A UAV system was used to obtain aerial photos from a height of approximately 50 m (approximately 30 cm spatial resolution). Normalized digital number (DN) values of Red and NIR channels were extracted from the aerial photos and a normalized differential vegetation index using DN ($NDVI_{dn}$) was calculated. The results show that the correlation coefficient between BM and $NDVI_{dn}$ was 0.88. For the precision management of hilly grazing pastures, UAV monitoring systems can be a quick and cost effective tool to obtain site-specific herbage BM data.

• Journal of The Korean Society of Grassland and Forage Science
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• v.14 no.4
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• pp.264-270
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• 1994

This experiment was undertaken to determine the effect of pasture ages on the total production and seasonal yield trends, botanical composition and forage quality of pasture mixtures. This experiment was conducted at the Livestock Experiment Station, RDA, Suweon. The results obtained were as follows : 1. Total dry matterDM) yield of pasture mixtures was the highest in the first year, and thereafter no significant reduction in the 2nd through the 4th year, but decreased by 30% in the 5th year. 2. The 34.4% of total DM yield was produced at the first cut, and decreased from then on. Total DM yield of pasture mixtures varied by year and climatic facton. In 1992, Total DM and TDN yields of pasture mixtures were 13.4 and 8.5 IvlT/ha, respectively. 3. The content of crude protein(CP), in virro DM digestibility(IVDMD) and TDN of pasture mixtures were 12-14, 70-80, and 62-65%, respectively. The highest forage quality was obtained at the 4th cutting. 4. The botanical compositions of legumes and weeds were increased as the year of establishment advanced, and highly increased at the 3rd cut after summer growth. 5. Based on the results of this study it appears that economic forage production could be expended to the 4th year with proper management, and the special renovation techniques may be needed for maintenance of pasture yield from the 5th year.

• Journal of The Korean Society of Grassland and Forage Science
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• v.38 no.3
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• pp.150-155
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• 2018

This study was conducted to determine grazing intensity of growing Korean native goats(Capra hircus coreanae) on mountainous pasture. It was carried out to obtain basic information for improvement of mountainous pasture management and establishing feeding system of Korean native goat. A total of 20 goats were grouped by feeding systems [A mountainous pasture grazing group (Concentrated feed of 1.5% body weight, treatment 1, T1, n=10) and a barn feeding group (TMR, treatment 2, T2), n=10] to conduct study from April to September. The average forage productivity of the mountain pasture was $500.9{\pm}61.41kg/ha$. The average dry matter intake in T1 was 0.64 and the calculated grazing intensity was 21 head/ha. In productivity, when the two treatments(T1, T2) were compared, the dry matter intake was about two to three times the difference. The average daily gain per day during the experiment was 63.3 in the mountain pasture and 120 g in barn feeding. When grazing, considering mountainous pasture productivity it is necessary to increase the productivity through proper feeding. The feed costs of black goats raised by grazing on the grassland in the same period showed an average 75% reduction compared to barn feeding. As a result of this study, it can be expected that a considerable reduction of feed costs can be expected in the breeding of Korean native black goat using the mountain pasture.

• Journal of The Korean Society of Grassland and Forage Science
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• v.16 no.3
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• pp.183-189
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• 1996

The productivity and utilization of four different grasdlegume pastures for grazing management were examined. The pasture mixtures used in this study were orchardgrass + ladino clover (Tl), orchardgrass + alfalfa (T2), perennial ryegrass + alfalfa (T3), and orchardgrass (T4, without legumes) respectively. The pastures were mtationally grazed 7 times with growing cow which had an initial weight of ca 243kg. The gmwth of pasture plants, dry matter (DM) yield, DM distribution, daily DM production, and pasture utilization were investigated at the NLRI, in Suwon, from April to October in 1991 and 1992. The average plant height at each grazing was 32-33m. The average DM content was 17.8%, wil the lowest in TI (16.4%) and highest in T3 and T4 (18.4%). The annual DM production were 9,609 kg (T3), 9,420 kg (Tl), 9,402 kg (T2), and 9,194 kgha (T4) in that order, but no significant differences were found in forage yield between treatments. Most of forage DM was produced in spring season, particularly in May. The daily DM production was highest in May (81.9kg), and lowest in August (33.0kg/ha). The average efficiency of pasture utilization was about 79%, with the lowest in TI (77%), and highest level of utilization was observed in T4 (82%). In this experiment, production and utilization of each pastures were observed similarly. However, the forage nutritive value, botanical composition, and animal performance as affected by different pasture mixtures for suitable grazing management are needed to ascertain.