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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
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Journal DOI :
The Korean Society of Grassland and Forage Science
Editor in Chief :
Volume & Issues
Volume 9, Issue 3 - Sep 1989
Volume 9, Issue 2 - May 1989
Volume 9, Issue 1 - Jan 1989
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Studies on the Grassland Management in Late-Autumn and Early-Spring III. Effect of fertilizer application time in spring on growth, crude protein content and yield of grasses for soiling
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 1~6
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
and the subsoil temperature at 10 cm depth was 8 and
. 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.
Studies on the improvement and Utilization of Pasture on the Forest III. Seasonal herbage production and utilization of pasture on the forest
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 7~14
This experiment was carried out to determine the seasonal herbage production and utilization during the growing season of pasture on the forest (shading 30%). Plant height, leaf area index(LAl), dry matter(DM) production and distribution, chemical composition, in vitro dry matter digestibility(IVDMD), herbage utilization percentage and chewing efficiency were investigated using the Corridale sheep. Experimental field was treated by one plot design(3 rep.) and performed from 1987 to 1988 at Chungnam National University, Daejon. The results obtained are summarized as follows: 1. The highest plant height and LA1 were observed in May(35.0 cm, 4.89), followed by April(28.0 cm, 4.23), while the plant height and LA1 in October (13.0 cm, 0.49) showed very low. 2. During the growing season, about 58.3 % of annual DM production (7240 kg/ha) was produced during the spring (April, May and June) and the highest DM production was obtained in May (2040 kg/ha), which was more than 28.2 % of total DM production. However, DM production in July and August was about 24.2 % and those in September and October (17.5 %) was very low, but the difference of DM production from June to September was small. 3. The maximum DM production per day (65.8 kg/ha) was observed in May, followed by June (28.7 kglha), while DM production per day in October (16.5 kg/ha) showed very low (p <0.01). 4. Crude protein content and IVDMD of herbage samples during the spring (April, May and June) were higher, while crude fiber, ADF, and NDF content were lower in an summer growth herbage samples (July and August), but autumn growth herbage samples was intermediate. Crude ash content and IVDMD of collected herbage samples were slightly more, while crude fiber, ADF and NDF content were slightly less than offered and residued herbage samples during the growing season. 5. The maximum DM intake per metabolic body size was observed in May(68.9 g), followed by October (66.7 g), while very low in August (52.5 g). Significant positive correlation (p <0.05) was found between DM intake and IVDMD. 6. Herbage utilization percentage was very high in April (83.4 %), while very low in August (64.0 %). The percentage of annual herbage utilization was about 75.5 %. 7. The maximum ruminating and chewing efficiency of herbage samples were observed in May, followed by October, while very low in August.
Vegetational Structure of Orchardgrass Sward II. Changes in dry matter production of the 2nd cutting by the times of established pasture
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 15~19
This experiment was carried out in order to know the changes in dry matter production of the 2nd cutting by the times of established pasture and its relation with morphological and structural characters of orchardgrass sward. Experimental pasture was established by the times of year, from 1 year to 7 year, 1986 through 1980, alternately. The results were summarizedas follows: 1. The population density of the 2nd cutting was extremely decreased by the times of established year. 2. The dry weight of
was positively significant correlations with plant length(PL), number of tillers per plant (NT/pl.) and the dry weight of plant(DW/pl.). 3. The highest value of the dry weight of plants(DW) was obtained at 7 year old pasture. 4. The pasture productivity of 7 year old pasture was resulted by the increases of regrowth capacity, yield components and structural characters of the 2nd cutting. 5 . Relationship between morphological and structural characters concerned vegetational structure of the 2nd cutting were changeable year by year.
Vegetational Structure of Orchardgrass Sward III. Decreasing causes of plant density
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 20~25
This experiment was carried out in order to know the decreasing causes of plant density and its relations with pasture productivity by the times of established pasture. The results were summarized as follows, 1. The yield components of dead plant can be used to estimate the changes of pasture productivity by the times of established pasture. 2 . The number of dead plants(PD) showed a quadraticalrelation with mean dry weight of dead plant
by the times of established pasture. 3. Relationship between relative number of tillers per dead plant to mean number of tillers of adjacent plants (RNT) and relative ratio of number of tillers per dead plant to number of tillers of plants in the 1st cutting (RNDT) showed highly positive significant correlation in 1 and 3 years old pasture. 4. Less than 100 of RNT were 79.5 %, 71.4 % and 100 % of dead plants in 1, 3 and 5, and 7 years old pasture, respectively. 5. Not exceeding values of RNDT to MRRNT were 89.7 %, 71.4 % and 100 % of dead plants in 1, 3 and 5, and 7 years old pasture. 6 . The values of 79.5 %, 57.2 % and 100 % of dead plants in 1, 3 and 5, and 7 years old pasture were not exceeding to MRRNT and less than 100 of RNT. 7. From the results described above, it was discussed that the relative number of tillers per dead plant(RNT) should be described not absolute deaeasing causes of plant density in 1 and 3 yars old pasture. But, the total number of dead plants in 5 and 7 years old pasture were absolutely influenced by RNT and MRRNT.
The Optimal Combination and Amount of Major Nutrients Computed by the Homes Systematic Variation Technique for the Hilly Pasture Development I. Determination of the optimal combinations of anions N:S:P and cations K:Ca:Mg in fertilation on a grass-clover mixed sward
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 26~33
This pot experiments were conducted to find out the optimal fertilization ratios of the N:S:P anions and K:Ca:Mg cations of major nutrients in an orchardgrass/ladino clover mixed sward. The optimum ratios in equivalent basis were computed by the Homes systematic variations technique. The soil samples were collected from the newly reclaimed soils, which are located on colluvial hilly area with a good consideration for the hilly pasture development. The results were summarized as follows; 1, the optimum fertilization ratios of major nutrients for the high yields by the forage species in a mixed sward were obtained (Table 4 in detail); N:S:P = 3:l: 1 and K:Ca:Mg = 1:l: 1 for grass and grass plus legume, and N:S:P = 1:6:43 and K:Ca:Mg = 1: 3: 1 for legume in general. 2. The yield increases from the systematic variations in this mixed sward were laid in following order; N > P >S-group and K >Mg >Ca-group for grass and grass plus legume, and P >S >N-group and Ca >Mg > K-group for legume. Especially, the yields were greatly increased at the N-group for grass, and at the Pand Ca-groups for legume. 3. Soil pH-value was descreased at the Sgroup, and somewhat increased at the Ca- and Mg-groups. The content of available
, CEC and base saturation were greatest with the Ca-group. 4. At the N-group, the N-contents were highest and the P-contents were lowest in grass and grass plus legume, which resulted in the highest Ca/P ratio of 2.15 among the anion groups. Whereas the highest Ca/P ratio of 9.20 in legume was obtained at the Ca-group. Legume showed in general higher Ca/P ratio and lower K/(Ca+Mg) ratio than these in grass. 5 . There were differences in the effects of systematic variations of major nutrients on the dry matter yields and the mineral yields. The optimum fertilization ratios of anions and cations for the high mineral yields were obtained (Table E), which showed differences comparing with the ratios for the high dry matter yields. The antagonis between the cations K and Mg was known from the point of mineral yields of mixed forages.
The Optimal Combination and Amount of Major Nutrients Computed by the Homes Systematic Variation Technique for the Hilly Pasture Development II. Determination of the optimal combination of
cation and the optimal appoication rate of total ions
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 34~42
This pot experiments were conducted to find out the optimal fertilization ratios of
, and the optimal application rates of total major nutrients in an orchardgrass/ladino clover mixed sward. The optimum ratios and concentrations in equivalent basis were computed by the Homes systematic variations technique. The results were summarized as follows; 1. The optimum fertilization ratios of
and the optimum application rates of total nutrients for the high yields by forage species in a mixed sward were obtained (Table 6 in detail);
= 2 : 1 at 80 and 320 meq/pot, and 3 : 2 at 560 and 800 meq for grass and grass plus legume, and
= 1 : 2 for legume in general. 2. The optimum application rates of total nutrients for the high yields of grass and grass plus kgum were increased by decreasing the
: ratio, whereas these for legume showed a valible. range without significance. 3. The yields 01 grass and grass plus legume were generally increasing by increasing both the
ratio and total concentration, but they were significantly higher at the
= 1.273 than at the 2.125 under the high total ion concentration. The legume yields were proportional to
ratio and increased by increasing the total ion concentration under the condition of high
ratio. 4. The efficiencies of
in relation to the grass and grass plus legume yields were highest with the low ratios of each other and the low rates of total nutrients
efficiency m the legume yield tended to be similar to that of
in the grass yield noted above. The
efficiency in the legume yield, however, was generally proportional to the
ratio except at the low rate of 80 meqlpot. 5. The yields of grass plus legume, yield components and botanical compositions in a mixed sward were greatly influenced by the
ratios, the fertilization rates of total nutrients, and the interaction of ratio and rate noted above. These effects were generally different and opposite accading to grass and legume. In addition, the soil chemical properties and mineral contents of forages were partially influenced by these systematic variations.
Mineral Leaching from Forage Placed on Soil Surface of Meadow -Especially for Potassium-
Kim, Sangdeog A. ; Shigekata Yoshida ; Ryosei Kayama ;
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 43~47
The Effect of Animal Menure on the Soil Characters and Productivity of Grassland
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 48~55
This experiment was conducted to investigate the effect of animal stable manure on the dry matter yield, botanical composition, crude protein content rates, in vitro digestibility and soil characters with treatments, which were divided into cattle manure, swine manure and poultly excreta of 375 and 750kg/lOa, respectively. The results obtained were summarized as follows: 1. A comparison made on the grass yield for one year period following the termination of the experiment did not indicate any signification in the yield of dry matter difference between chemical fertilizer treatment and 750kg/10a of organic manure. 2. Botanical composition was not shown an increasing of weed or bare land in organic manure of 375 and 750kg/lOa application during the whole period of growth. 3. Crude protein content and in vitro digestibility were shown an increasing tendency according to the increase of organic manure application. 4. Crude protein yield in organic manure of 750kg/10a was not a large difference compared with chemical fertilizer treatment. 5. Soil composition of organic manure had higher than the soil composition of chemical fertilizer treatment, which was shown an increasing tendency according to the increase of organic manure. 6. Therefore, It was suggested that the effect of organic manure on dry matter yield, botanical composition was similar to chemical fertilizer treatment and soil composition of organic manure had higher organic matter, available phosphate, potassium and C.E.C than the soil composition of chemical fertilizer treatment.
Study on Botanical Composition of Native Pasture in Cheju by Quadrat Method -Especially at 200m above sea level-
Journal of The Korean Society of Grassland and Forage Science, volume 9, issue 1, 1989, Pages 56~61
A vegetation survey of the native pasture was conducted in Cheju from July to September, 1980. The purpose of this investigation were, to determine the botanical composition of the native pasture and to estimate how they can be improved to the feed resources of livestock industry. The results obtained are summarized as follows: 1. Grass species existed in native pasture were 64 species with Pwceae 13, Fabaceae 8, Carduacea 12 and other 31. Most of them were identified as perennial grasses. 2. Botanical composition of major grass species were Imperata cylindrim 32.7 %, Pteridium aquilinum 18.9 70, Miscanthus sinensis 8.4 %, and Arternisia japonicn 2.8 % respectively. 3. The average dry matter yield of forage taken on the native pasture was 383 kg per 10a and these yields were increased as the growing stages progressed. 4. Seasonal distribution of edible plants were increased as the growing stages progressed.