• Journal of The Korean Society of Grassland and Forage Science
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• v.8 no.1
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• pp.20-25
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• 1988

This experiment was conducted to find out the effects of the different cutting height on the chemical composition, energy production and relation of yields of Italian ryegrass, tall fescue and perennial ryegrass swards. It was carried out on the experimental field of Livestock Experiment Station, in Suweon, from Sept. 1986 to May 1987. The results obtained are summarized as follows: 1. Chemical composition and Van Soest fiber contents were slightly different among grasses. But were not same trend with cutting heights. At the late vegetative stage, crude protein and crude fiber content were much more in tall fescue, Ash in perennial ryegrass, E.E. and NFE in Italian ryegrass respectively. NDF, ADF, Hemicellulose, Lignin, Cellulose and Silica contents were much more in tall fescue than the others. 2. DM, DCP, TDN, StE, ME and NEL productions were appeared to high in line with Italian ryegrass, perennial ryegrass and tall fescue. In addition 6 cm cutting height was the most production in Italian ryegrass, 15 cm cutting height was the most production in perennial ryegrass and tall fescue. 3. The much more content of crude protein, the less nonstructural carbohydrate content. The less content of NDF, the much more nonstructural carbohydrate content. Green and dry matter yield before wintering were not influence the green and dry matter yield of the late vegetative stage, but green yield before wintering influenced total green yield.

• Journal of The Korean Society of Grassland and Forage Science
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• v.11 no.3
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• pp.182-188
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• 1991

With a purpose of finding out the effects of cattle slurry applicatioin on the dry matter yield, yield component, and botanical composition in the mixed sward, a field experiment was conducted with two times and five levels of cattle slurry application. The experimental field was laid.out in a split-plot design with three replications, and lasted from September. 1986 to October, 1990 at the Livestock Experiment Station in Suweon, The results obtained are summarized as follows: 1. At each harvest time, the plant growth of the plots with cattle slurry application was slightly worse when compared to dressing of mineral fertilizer. 2. Average dry matter yield for 4 years was not significantly different between the slurry application times, just after cutting, and 15 days after cutting, The DM yield in the plot with cattle slurry 30 m!/ha and mineral fertilizer(9,095 kg/ha) and with cattle slurry 60 m1/ha and mineral fertilizer(8, 987 kg/ha) were decreased by 8% and 10% than that of the plot with mineral fertilizer application(9,937 kg/ha), respectively. 3. The DM yield component of the plots with cattle slurry application just after cutting was much better when compared to manuring 15 days after cutting. And it was much better in the plot with cattle slurry 60 m"/ha and mineral fertilizer which was composed of 73.8% grasses(6.636 kg/ha). 24.6% legumes (2,207 kdha) and 1.6% weeds(144 kdha). 4. In general, the botanical composition was relatively good in the plots with slurry application just after cutting. Grassland vegetation of the plots with cattle slurry 60 m"/ha and mineral fertilizer was changed into much better botanical composition with 66.8% grasses, 30.2% legumes and 3. 1% weeds at the end of the experiment.xperiment.

• Korean Journal of Environmental Agriculture
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• v.22 no.4
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• pp.273-277
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• 2003

The aim of this study was to apply the new agricultural technique developed for three years($'96{\sim}'98$) by demonstration at an model farm of environmental agriculture located in Bangsan-ri, Dagang-myun, Namwon-city. Rice growth of environmental farming plot, which supplied with oil cake and compost fermented with chicken manure was reduced compared to that of conventional farming plot, which supplied with chemical fertilizers. Weed control by using of Ampullarius insularus in the rice paddy field was effective compared to that of control, which treated with chemical herbicide twice. The yield of rice was decreased of 35% in both environmental and eclectic farming polt compared to that of conventional farming plot. The water quality of environmental not and eclectic farming plot were good compared to conventional farming plot. Density of water flea was high in environmental and eclectic farming plot compared to that of the conventional farming plot.

• Journal of The Korean Society of Grassland and Forage Science
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• v.7 no.1
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• pp.18-24
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• 1987

This experiment was carried out to investigate the effects of the final cutting time and cutting height on the winter survival, regrowth, and carbohydrate reserves in stubble, and early spring yield of orchardgrass-dominated pasture before and after the winter season. The experiment was conducted at the experimental field of the Livestock Experiment Station, in Suwon, from October 1985 to early 1986. The results obtained are summarized as follows: 1. Regrowth of plant after the final cut increased significantly (P<0.05) with plot of the early cutting time (Oct. 10) and high cutting height at the final. For winter survival, cut plant should regrow over 15cm in plant height. Therefore limit cutting time and cutting height were forced to be on Oct. 25 and at 6-9cm, respectively. 2. Total water soluble carbohydrate (TSC) content in stubble after the final cut was not significantly changed by different cutting time and cutting height. 3. The percentage of dead plant after wintering was found to be high with plot of the late cutting time and low cutting height at the final cut (P<0.05). And the correlation between the percentage of dead plant after wintering and final plant height before wintering was significantly negathe (r = -0.728**). 4. Fresh and DM yield at the early spring after wintering were increased in the plot of the early cutting time and high cutting height (P<0.05) at the final cut. And significantly positive correlation was observed between the early spring yield and final plant height before wintering (r = 0.720**).

• Journal of The Korean Society of Grassland and Forage Science
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• v.10 no.1
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• pp.21-26
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• 1990

This field experiment was carried out to determine the effects of nitrogen(N) application time (March 30, April 9 and April 19) and N fertilizer kind (urea and ammonium sulfate) in early spring on the grass growth, dry matter (DM) yield, crude protein (CP) content, CP yield (CPY), acid detergent fiber (ADF) content, DM digestibility (DMD) and N recovery in orchardgrass (Dactylis glomerata L.) meadow for soiling, 1989. The amount of N applied in early spring was 70 kg $ha^{-1}$, and non-fertilized plot was involved as control. In all fertilized plots the growth, DM yield, CP, CPY and regrowth yield of grasses were significantly increased compared with control. The best grass growth and DM yield were observed on March 30, and the best CP, CPY and N recovery were observed on April 9 among all fertilized plots. Also there were not significant differences between urea and ammonium sulfate fertilizer in grass growth, DM yield, CP, CPY, ADF, DMD and N recovery. In Suwon area, therefore, the optimum time of N application for soiling in early spring may be recommended early April, regardless of fertilizer kind of N.

• Journal of The Korean Society of Grassland and Forage Science
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• v.18 no.1
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• pp.55-60
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• 1998

This study was conducted to investigate the effects of the pasture types and the leveling methods of winding slope land for seedbed on the runoff, soil loss, botanical composition, dry matter yield of forage and economical value at the Experimental Field of Grassland and Forage Crops Division, National Livestock Research Institute, Suweon, from 1994 to 1995. The results obtained are summarized as follows: 1. Runoff of the improved land was higher than that of the unimproved land in the top grass and bottom grass. 2. Soil loss of the improved land was higher than that of the unimproved land in the top and bottom grasses in the first year. However, it was slightly higher in the unimproved land, and all of it were greatly decreased in the second year. 3. The percentage of grasses coverage was increased with the improved land in the first year, and it was not different between the improved land and unimproved land in the second year. Also, it was slightly increased in the bottom grasses. 4. Dry matter yield of grasses was increased with improved land at the top and bottom grasses. DM yield of grasses was increased in the top grasses in the first year and bottom grasses in the second year, respectively. 5. The establishment cost of grasses was decreased with wages decrement, and the management cost was saved about 1,116,000 won per ha with improved land. The results demonstrated that although soil loss was increased by leveling methods of improved land irrespective of pasture types in the first year, it was decreased with time little by little. Also, improved land was very good for grasses coverage, dry matter(DM) yield and economical value.

• Journal of The Korean Society of Grassland and Forage Science
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• v.18 no.1
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• pp.1-10
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• 1998

Eleven sorghun-sudangrass hybrids have been recommended as the government recommended forage cultivars, however, their forage performance and quality have mostly been tested at two regions, such as Suweon in the Middle Northwestern Coast Region and Sunghwan in the Middle Southwestern Coast Region. Therefore, the objective of this experiment was to retest the forage performance and quality of eleven government recommended sorghum-sudangrass hybrids(TE haygrazer, 988. TE haygrazer-R, SX-17, NC + 855, 855F, GW9110G, G83F, Sordan 79, Speed feed and Jumbo) at five regions, such as Icheon in the Middle Northern Inland, Suweon in the Middle Northwestern Coast, Sunghwan in the Middle Southwestern Coast, Keongsan in the Keongpook Inland and Kwangju in the Southern Inland, 1993 and 1995. Among the eleven hybrids tested, 'NC + 855' gave the highest forage yield at all regions when averaged over the two-year period, but others varied by region. 'NC + 855' was the highest yielding at Icheon, Keongsan and Kwangju, G83F was highest at Suweon and 855F was highest at Sunghwan. 'Jumbo' (headless type) was generally higher in forage quality than others, but at both Suweon and Icheon, 'NC + 855' and '855F' were higher quality than others. As the results of the experiment, 'TE haygrazer', 'NC + 855' , G83F and 'GW9110G1 at Icheon, 'G83F' and 'Sordan 79' at Suweon, 'NC + 855' and '855F' at Sunghwan, '988' and 'NC + 855' at Keongsan, and 'TE haygrazer-R' , 'NC + 855', 'GW9110G' and 'G83F' at Kwangju might be preferable to other hybrids because they have higher forage yield.

• Journal of The Korean Society of Grassland and Forage Science
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• v.9 no.1
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• pp.1-6
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• 1989

This field experiment was carried out to determine the effects of fertilizer application time in spring on the growth, crude protein(CP) content and dry matter(DM) yield of grasses for soiling. Application times of fertilizer were March 10, 20, 30, April 9 and 19, and control (non-fertilized) plot was involved. All fertilized plots were also treated with single- and compound fertilizer. The first harvesting date for soiling was May 12, and the regrowth soiling yield was investigated on June 9, 1988. In all fertilized plots, the growth, DM yield, CP, CP yield and regrowth yield of gasses were significantly increased compared with control, and the best grass growth, DM yield, CP, CP yield and N recovery were observed on March 30 and April 9 among all fertilized plots. And there were not significant differences between singleand compound fertilizer treatment in grass growth, DM yield and CP content. On March 30 and April 9 in this experiment, the accumulated temperature was 120 and 200^{\circ}C.$ and the subsoil temperature at 10 cm depth was 8 and 10^{\circ}C.$. Considering the average meteorological condition in Suwon area, the optimum application time of spring fertilizer for soiling may be recommended from April 3 to April 10.

• Journal of The Korean Society of Grassland and Forage Science
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• v.8 no.3
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• pp.141-146
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• 1988

This field experiment was carried out to determine the effects of fertilizer application time in spring on the growth, crude protein (CP) content and dry matter (DM) yield of gasses for grazing Application times of fertilizer were on March 10, March 20, March 30, April 9 and April 19, and control (non-fertilized) plot was involved. All fertilized plots were also treated with single and compound fertilizer. The first harvesting date for grazing was on April 30, and the regrowth soiling yield was investigated on June 9, 1988. In all fertilized plots, the growth, DM yield, CP, CP yield and nigrogen recovery of grasses were significantly increased compared with control, especially on the plot of March 30. The regrowth yield on March 30, April 9 and April 19 were shghtly hig!!a than those of the others. And there were not significant differences of grass growth, CP content, and DM yield between single-and compound fertilizer treatment. On March 30 which was the best time of fertilizer application in spring, the accumulated temperature was 116.6^{\circ}C.$ and the subsoil temperature at 10 cm depth was 8.1 - 8.6^{\circ}C.$. Considering the average meteorological condition in Suwon area, the optimum application time of spring fertilizer for grazing may be recommended on March 30-April 3 (accumulated temp.; 100-125^{\circ}C.$, subsoil temp.; 8-9^{\circ}C.$).

• Journal of The Korean Society of Grassland and Forage Science
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• v.8 no.3
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• pp.99-103
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• 1988

With a purpose of finding out the effects of magnesium and boron enriched organic-compound fertilizer application on qualities of grasses on the hilly pasture, a field experiment was arranged with five dilferent treatments as a randomized block design and lasted from September, 1984 to the end of growing season in 1986. The results obtained are summarized as follows: 1. Mean chemical components except NFE of grasses at the plots with organic-compound fertilizer application were appeared to contain slightly high comparing to single dressing. 2. Production of DCP with organic-compound fertilizer (1,170.2 kg/ha) was significanty increased by 20% comparing to single dressing (975.7 kg/ha) in the conventional fertilization level (P<0.05), but it was not significantly different between them in the low dressing level. 3. Production of energies (TDN, StE and NEL) with organiccompound fertilizer of low and conventional dressing level were appeared to increase by 10 and 13 to 15% than those of single dressing of the same levels, respectively. But it was not significant difference. 4. Like single dressing nutrient productions with organic-compound fertilizer were appeared significantly high due to increasing of dressing gradually (P<0.05-0.01). 5. Mineral contents of P and Mg at the plots with organic-compound fertilizer were a little higher, on the other hand, K, C/P and K/Ca + Mg equivalent ratio were slightly lower than those of single dressing, but the content of Ca tended to similar between them.