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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
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Volume & Issues
Volume 13, Issue 4 - Dec 1993
Volume 13, Issue 3 - Sep 1993
Volume 13, Issue 2 - Jun 1993
Volume 13, Issue 1 - Mar 1993
Selecting the target year
Selection of Acid Tolerant Red Clover Cell Line on the Cellular level II. Effect of some factors affecting suspention culture and acid tolerant cell selection
Son, Dae-Young-Son ; Lee, Soon-Hee-Lee ; Jo, Jin-Gi ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 1~1
This experiment was conducted to select acid tolerant cells from red clover suspension culture and obtained following results. The most effective con¬dition of plant growth regulators for suspension culture of red clover cells was 2 mg/t 2,4-0 as auxin source plus 0.5 mg/l BAP as cytokinin source. Among serveral basal media. PC medium brought the best result. The most suitable EMS concentration for the mutated cells tolerant to acid was 1 % with fours treatment and average 27 colo¬nies/plate were selected. The frequency of the occ¬urence of mutants tolerant to acid in I % EMS with four hours treatment was 8.9
which was 100 times larger than that of control. The total colonies selected initially were 176 but the survived colonies after two subcultures with 4 weeks interval in a selection medium were 44.
Evolution of Nitrogenous and Non-Structural Carborhydrate Compounds in Remaining Tissues Following Shoot Removal of Alfalfa ( Medicago sativa L. )
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 7~7
Nitrogenous and non structural carbohydrate compounds in the remaining tissues of 10 weeks oldalfalfa (Medicago sativa L.) grown in hydroponic culture, were analysed during 24 days of regrowthfollowing shoot removal.The dry weights of the remaining organs were not significantly changed for 10 days following shootremoval. Compared with uncut plants, defoliation drastically depressed root growth, in particular thatof taproot. During 6 days of regrowth, nitrogen contents in all remaning organs significantly decreased.Nitrogen loss in this period was pronounced in root system. Nitrogen contents in each organ after24 days of regrowth in defoliated plant were recovered completely or exceeded initial level. Aminoacid-N was the most readily available form of nitrogen while protein-N was the largest storage pool.The tap root contained about 51.0 % and 33.4 %, respectively, of the total starch and total ethanolsolublesugar contents. The starch content of tap roots initially exceeded 40.7 mg. plant-' (day O), andthen declined to the minimum level on day 14.This result clearly showed that the tap root is the major storage site for metabolizable nitrogen(protein-N and amino acid-N) and carbohydrate(starch), and that the degradation of these researvesoccur much actively in the early period of regrowth.
Studies on the Nitrogen Fixation of Legumes I. Effects of nitrogen fertilization level on nitrogen fixation and growth of ladino clover
Lee, Hyo Won ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 16~16
Ladino clover stolon growing in grazed sward transplanted in 1/5,00Oa Wagner pot with two rowsand were grown in green house with 12h lighting. Fifty days after transplanting the first cutting wasmade, the secound and 3rd cutting was made 20 days after each harvest. Treatment were nitrogenfertilization level of 2.5, 5.0 and 7.5 kg N/lOa. Nitrogen was top dressed after transplanting and eachcutting. Growing point, above and under ground DM yield, nitrogen fixation, crude protein of stolon.root and change of acetylene reduction activity after cutting were investigated. Result are as follows.1. Growing point, DM production were heighst in 5 kg N at the first and 2nd harvest while 2.5 kgat 3rd cutting. Plants with 7.5 kg N/lOa were dead at 3rd harvest. There were significant differencesin growing point between treatment.2. Nitrogen fixation of ladino clover were the heightest in 2.5 kg N pot at 1st cutting and as cuttingand N fertilization were contiuned nitrogen fixation activity was lowered.3. Leaf have more crude protein than that of stolon and root while plant crude protein ~ncreased by2nd cutting as plant got more nitrogen fertilizer and again decreased in 3rd cutting.4. Acetylene reduction activity were lowest at 3 week and recovered normal level at 5 week after cutting,also DM root was same trend.
The Role of Phosphorus on Plant Succession of Grassland in Andosol Region II. Accumulation and decomposition of litter in natural grassland community
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 23~23
This study was investigated about decomposition process of litter that is reduction pathway ofphosphorus from plant body to soilThat is, in each community of Miscanthus sinensis, SaSa palmalta, Artemisia princeps and Polygonwnthunbergii, disappearing speed was calculated from total fallen leaves yield supplied as litter andlitter existant yield.Besides, setting up litter bag that put litter in nylon mesh bag, calculated disappearing speed fromdecreasing speed of the weight of contents and then was compared and examined.The results obtained are summarized as follows :1. Maximum litter yield was sequently Miscanthus sinensis)SaSapalmalta)Artemisia princeps)Polygonwnthunbergii, but, supplied litter yield was sequently Artemisia princeps)Miscanthus sinensis)Polygonwnthunbergii)SaSa palmalta.2. Reduction speed of phosphorus from plant body to soil was Polygonum thunbergii)Artemisia princeps)Miscanthus sinensis)SaSa palmalta.3. Caculated disappearing speed using litter bag method was shown latter tendency than that of naturalcondition.4. It was significantly negative relationship between N contents of litter and disappearing speed of litter.
Accelerated Germination of Orchardgrass ( Dactylis glomerata ) Seed Under Water Stress by Seed Pre-treatments
Baek, Seong-Beom ; Kim, Geon-Yeop ; Kim, Heung-Bae ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 31~31
It is important to improve the germination of grass seeds because they are poor germination underwater stress. This experiment was conducted to investigate the response of seeds pretreated individuallywith Polyethylene glycol 6000 (PEG) and growth regulators(
, Kinetin, NAA) on the germinationcharacteristics when two levels of osmotic potential (0, -5 bar) were put to seeds of Orchardgrass.In the untreated seeds, the total germination rate was decreased under water stress, and the meangermination time was delayed. Priming of Orchardgrass seeds using PEG or
resulted in improvedgermination under water stress(-5 bar), whereas the opposite was true of kinetin or NAA. The responseofseeds primed in solutions of either -15 bar PEG or 100 ppm
was particulary markedcompared with the untreated seeds. It is suggested that PEG and
may have positive regulatoryeffects in triggering the system for water stress alleviation. But the inhibitory effect of the water stresswas not completely removed by allowing the seeds to pre-treat in solution of PEG or
Effect of Mixture Type on the Herbage Yield and Quality
Lee, In Deok ; Lee, Hyeong Seok ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 38~38
The objectives of this experiment were to suggest that the suitable mixture type for the herbageuse under an intensive system of short-term pasture utilization in fallow land. The field trials wereconducted over a 3-year (1989-1991) period to evaluate the effects of mixture types (pure stands;orchardgrass (OG), simple mixtures; orchardgrass (OG) + red clover (RC), and complex mixtures (C.Mix: orchardgrass + tall fescue + Kentucky bluegrass + ladino clover) on the herbage yield andquality.Mean total dry matter yields per hectare over the three years were higher for OG + RC as11,849 kg than for OG as 10,709 kg and for C. Mix as 11,371 kg (P<0.05). The concentrations ofcrude protein were not different among treatments while the concentrations of organic matter digestibilityin total herbage over the three years from OG + RC were higher than OG (P<0.05). The totalherbage crude protein yields were higher for OG + RC as 2,231 kg than for OG as 1,816 kg andfor C. Mix as 2,053 kg (P<0.01). The total herbage digestible organic matter yields were higher forOG + RC as 7,147 kg than for OG as 6.1 I6 kg and for C. Mix as 6,817 kg (P<0.05). On the otherhand, organic matter intake per kg were different among the treatments, while organic matter intakeper live weight kg from OG + RC as 338 g and C. Mix as 392 g were higher than from OG as377 g (P
Studies on the Applicetion of Cattle Slurry in Grassland III. Grazing Preference as Affected by application time of cattle slurry on pasture
Kim, Jae Gyu ; Seo, Seong ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 43~43
This experiment was carried out to determine the effects of application time of cattle slurry ongrazing pasture on the grass growth. dry matter yield, nutritive value, animal preference, and efficiencyof pasture utilization. Four different application times of slurry(right now after grazing, 5th day, 10thday, and 15th day after grazing), and a no-slurry(control) plot were designed, 1991-1992.Annual application amount of slurry was 40 m3/ha, and slurry was applicated in spring(2 times),summer and autumn. Total NPK fertilizer applicated were same as 280, 200 and 240 kg/ha in alltreatment, respectively. The pasture was grazed with growing beef cattle(initia1 body wt.: ca. 250 kg)at every 30-35 cm of plant height.The grass height, dry matter yield, crude protein yield, and other nutritive value were not differentamong treatments. However, the animal preference and efficiency of pasture utilization showed significantdifference by application time of slurry.The highest grazing preference (1: the worst-9: the best), and utilization efficiency (0-100%) wereobserved by application time of right now after grazing (7.8, 76%), which was same to control(7.8,77 %), and followed by 5th day after grazing(7.3, 74%) and loth day after grazing(6.9, 71 %). But thepreference and pasture utilization were greatly decreased at application time of cattle slurry of 15th dayafter grazing(5.5, 60 %).From the above results, the optimum application time of cattle slurry on grazing pasture toenhance animal preference, and efficiency of pasture utilization was within 5 days after grazing (lessthan 13.6 cm of plant height), and within 10 days after grazing (less than 18.5 cm of plant height)at least.
Effects of Lime and NPK Application Rates on the Soil Charateristics after a 10-year Experiment in Oversown Hilly Pasture of Mixed Grass-Clover Sward I. Changes in the pH, contents of T-N, organic matter and available
absorption, and lime requirement by the soil depth
Jeong, Yeon-Gyu ; Lee, Hyeok-Ho ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 49~49
The main experiment related to this report was undertaken to assess the effects of two rates of
(0, 250 kg/l0a only at establishment) and five rates of N-
(0-0-0, 0-10-10, 6-15-15.12-20-20, 24-25-20 kg/lOa/year) on the pasture establishment, on forage yield and quality, vegetation etc. After this 10-year main experiment, this pasture had been used to assess the effects of the above treatments on the soil characteristics in oversown hilly pasture of a grass-clover sward. This 1st part is concerned with the soil properties of pH-value, OM, T-N, avail.
absorption coefficient, and lime requirement by the soil depth. I. The pH of the topsoil(0-15 cm) was lowered from pH 5.12 of before the experiment to 4.90 of when
was applied and to 4.68 of when
was not applied. The pH decrease was more evident with the increase of NPK application rate and in the upper part of the top soil(0.0-7.5 cm). The additional application of lime was necessary in all the experiment blocks due to the strong acidity of the soil, and the amounts of lime requirement were increased with increased application rates of NPK and soil depth. 2. The contents of organic matter and T-N were increased in all the blocks by the establishment of the hilly pasture, and were higher in
applied blocks than non-applied blocks. The contents were inversely correlated with the soil depth. No correlation was observed between the contents and the application rates of NPK. 3. The content of available
was increased with the increased application of P, especially in the upper part of top soil. The content in the upper part(O.O-7.5 cm) was about twice of that in the lower part(7.5-15.0 cm). Since the contents of available
were much higher than the optimum content (351 ppm and 697 ppm when 10 kg and 25 kg
/lOa/year were applied, respectively), it is necessary to decrease the application rate of
absorption coefficient in topsoil (0.0-15.0 cm) was more or less higher when no lime and less
was applied. No corre-lation was observed in subsoil.4. Further studies on the methods, rates, time of additional application of lime, and on the methods of decreased apllication of
should be performed for better management of oversown hilly pasture.
Evolution of Carbon and Nitrogen Concentrations in the Leaves as Related to Dry Matter and Crude Protein Accumulation of Forage Rape ( Brassica napus ssp. oleifera)
Jeong, U Jin ; Kim, Byeong Ho ; Kim, Tae Hwan ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 58~58
The purpose of this study is to determine the evolution of carbon and nitrogen concentrations inrelation to dry matter and crude protein accumulation in the leaves of forage rape(Brassica napusSubsp. oleifera, CV. Swiss) during the growth period. Field-grown plants were sampled at intervalsthroughout fall. winter, early and late spring.During over-wintering period(from Nov. 7 1991 to Feb. 4 1992). the carbon concentration in theleaves increased from 382 mg to 435 mg g
, while the concentrations ofnitrogen and crude proteinsignificantly decreased. There was little accumulation of fresh and dry matter in the leaves.On early spring growth from 4 Feb. to 30 Mar. marked carbon loss 37 mg.
and slightnitrogen accumulation occurred with the increase of fresh weight in the leaves. From spring growthto bolting stage(from 31 Mar. to 16 Apr.) the greatest accumulation of fresh and dry matter wasobserved and carbon and crude protein concentrations increased with a linear manner.After bolting stage the concentrations of carbon. nitrogen, hydrogen and crude protein in the leavessignificantly decreased until late blooming stage, and the decreasing rate was prominent in nitrogen(45.7 %) and crude protein(46%).From the results above it is recommended that fertilizer will be applied before early spring growth,and that optimal utilization period is a bolting stage. For the serious modification of the internal C/Nbalance during the overwintering period.
Comparative Tield and Nutritive Valur of Oat Varieties as Fresh-Cut Forage
Kim, Dong Am ; Kim, Jong Gwan ; Gwon, Chan Ho ; Kim, Won Ho ; Han, Geon Jun ; Kim, Jong Rim ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 66~66
The experiment reported here was conducted at Suweon and Sunghwan, to evaluate desirableagronomic characteristics, forage yield and quality of nine introduced oat (Avena sativa L.) cultivarsin comparison with the control cultivar Cayuse during the fall and spring seasons for three years.Speed oat and G-sprinter showed earlier in maturity than the control cultivar Cayuse, but Taiho,Zenshin and Almighty were recorded as late types. Taiho, Hay oat and Swallow tended to more lodgingthan the control cultivar under rainy growing conditions and Taiho. Zenshin and Hay oat weremore susceptible to barley yellow dwarf virus among the cultivars tested.At Suweon, the early type cultivars Speed oat and G-sprinter significantly outyielded the controlcultivar Cayuse over the 3 years of the fall experiment, but no significant forage yield was foundbetween the early type cultivars and the control in the spring experiment except for 1991. At Sunghwan,the early type Speed oat and late types Almighty and Zenshin significantly outyielded the control inthe fall experiment of 1991, but the 3 years of experiment showed no significant difference in the forageyield of oat cultivars in the spring experiment.Over the 3 years of the fall and spring experiments at both Suweon and Sunghwan, the crudeprotein (CP) content and in vitro dry matter digestibility (IVDMD) of the early types Speed oat andG-sprinter were lower than those of the control and late types, but the acid detergent fiber (ADF) andneutral detergent fiber (NDF) contents of the early types Speed oat and G-sprinter were slightly higherthan those of the control and late types.Results of this experiment indicate that the early type oat cultivars tended to higher forage yieldthan the late types when sown in the fall, but no cultivar differences in dry matter yield were foundwhen sown in the spring.
Environmental Adaptation of Tall Fescue Varieties in Mountainous Pastures II. Varieties differences of dry matter production and yield components in growth period of Autumn
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 78~85
This experiment was carried out to select for the varieties with high environmental adaptability in mountainous pastures of Taekwalyong area, and the evaluation was based on the data of varietal differences of dry matter production and yield components in Tall fescue cutting at various developmental stages in growth period of autumn. The results were summarized as follows; 1. The varieties with high number of tillers per plant(NT) showed a high dry weight of plant(DW) in all autumn cuttings. These varieties(Barce1 and Fuego) may be more adaptable to mountainous pastures of Taekwalyon area than other varieties. 2. The number of tillers per plant(NT) was significantly positive correlated with dry weight of plant (DW), but dry weight of tiller(WT) was not significantly correlated with dry weight of plant(DW) in all autumn cuttings. 3. The multiple regression equations of autumn cutting stages with mean dry weight of plant(DW) and number of tillers per plant(NT) can be used to estimate the cutting time to obtain maximum mean dry weight of plant(DW) and the highest number of tillers per plant(NT). The maximum mean dry weight of plant(DW) and the highest number of tillers per plant(NT) was estimated at the time of 21 Oct. and 26 Oct, respectively. 4. Dead leaves tended to increase greatly after the 2nd cutting(l4 Oct.) in growth period of autumn. 5. The number of tillers per plant(NT) was an important yield component before tiller density achieved equilibrium, but dry weight of tiller(WT, including dead leaves) was of most significant as a yield determinant after maximum tiller density reached in growth period of autumn.
Studies on the Domestication of of Field Bean ( Glycine soja Sieb and Zucc ) for Forage Crop I. Esterase isozyme variation and nutritive value of field bean
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 86~92
The variation of the esterase isozyme, germination rate, chemical composition and digestibility of field bean(G1ycine soja S. and Z.) were estimated. The results are as follows; 1. The banding patterns of the esterase isozyme in field bean were varied with the tissue and habitat. 2. The enzyme activity of the Est-I, Est-2, Est-3 and Est-4 in field bean showed a high value compared with the other enzyme. 3. The range of germination temperature in field bean was 10-40C and the optimum germination temperature was 25-
. 4. The crude protein(CP) contents was 19.9% in the whole plant, 27.8% in the leaf and 45.9% in the seed, the cellulose contents was 29.5% in the whole plant, 23.0% in the leaf and 13.8% in the seed, the neutral detergent fiber(NDF) was 62.6% in the whole plant, 47.9% in the leaf and 47.9% in the seed and the acid detergent fiber(ADF) was 44.5% in the whole plant, 28.4% in the leaf and 28.4% in the seed, respectively. 5. The digestibility of the field bean was 44.1% in the whole plant, 49.6% in the leaf and 75.1% in the seed, NDF was 26.2% in the whole plant 46.2% in the leaf, ADF was 29.0% in the whole plant, 47.7% in the leaf and 58.0% in the seed and Cellulose was 48.7% in the whole plant, 58.0% in the leaf and 70.2% in the seed, respectively. 6. Total digestible nutrients(TDN) of the field bean was 47.4% in the whole plant, 51.5% in the leaf and 70.2% in the seed, respectively. The digestible energy(DE) value was 2.1 kcal/g in the whole plant, 2.27 kcal/g in the leaf and 3.10 kcal/g in the seed and the metabolizable energy(ME) value was 1.72 kcal/g in the whole plant, 1.86 kcal/g in the leaf and 3.23 kcal/g in the seed, respectively.
Studies on the Grassland Development in the Forest XIII. Effect of potassium fertilization on grass production, nutritive value and nitrate nitrogen concentration by growing senson and growth stage under shading condition
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 93~98
To determine the effects of potassium(
) fertilization level(0, 100, 200 and 300 kg/ha/year) on the growth, dry matter(DM) yield, nutritive value and nitrate nitrogen(
-N) concentration of grasses grown under shading condition, this experiment was carried out in Grassland Div., LES, 1989. The plants were sampled on different growing seasons (spring, summer and autumn) and growth stages (grazing and soiling), respectively. Shade was controlled artificially ca. 45-50%, and the level of nitrogen fertilization was 200 kg/ha/year in all treatments. Higher DM was produced in spring 1, 453 kg at grazing and 2, 364 kg/ha at soiling stage, and DM production was increased with increasing level of
. In this experiment, the optimum amount of
fertilizer was 200 kg/ha. The neutral detergent fiber, acid detergent fiber, DM digestibility, and relative feed value of grasses were not affected by
fertilization, regardless of growing season and growth stage. The
-N concentration of grasses grown in spring was very low (ca. 1.0%), regardless of growth stage and
-N concentration was very high in summer and autumn season, also
-N was decreased significantly with increasing level of
fertilization (P<0.05). Application of
fertilizer, therefore, is thoughs to be desirable for reducing
-N concentration of grasses, especially in summer and autumn season. So annual split fertilization of
could be recommended on woodland pasture.
Studies on the Phosphatic fertilizer Application Grassland I. Effect of phosphatic fertilizer at the establishment and management of grassland on the yield and energy value of grasses
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 99~104
With a purpose of finding out the effects of phosphatic fertilizer application at the grassland establishment and management on the dry matter yield and quality of grasses, a field experiment was arranged with four treatments as a randomized complcte block design and lasted from September, 19 89 to October, 1991 in hilly area near Suwon. The results obtained are summarized as follows: 1. As a early plant growth. winter hardiness. growth vigour and coverage of grasses of the plots with phosphatic fertilizer were better than those of the plots without
. and the effect of application at the management was much better than that at the establishment of grassland. 2. The effect of phosphatic fertilizer on DM yield of legume was higher than of grass. Total DM yield with phosphatic fertilizer at the only establishment (5.688 kg/ha). at the only management (8.014 kg/ha) and at both the establishment and management of grassland (1 1,082 kg/ha) was much more increased by 38, 95 and 169% than that without phosphatic fertilizer (4.1 19 kg/ha), respectively. 3. The chemical component of crude protein and crude fat with phosphatic fertilizer was a little higher, on the other hand, content of NFE was lower than that without
fertilization, but the contents of crude fiber and crude ash did not tend to differentiate between treatments. 4. Production of encrgy(TDN, StE and NEL) with phosphatic fertilization at the establishment and the management of grassland was appeared to increase by 34 to 390h and 72 to 99% than that without
, respectively. Production of curde protein with
tended to be similar to production of energy.
Response of Magnesium Content of Forages to potassium Application in grassland
Sangdeog A. Kim ; Shigekata Yoshida ; Mitsuaki Ohshima ; Ryosei Kayama ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 105~111
Forages were sampled from an orchardgrass (Dactylis glomerata L.) meadow during two years in order to know both the characteristics of spring grass, which differ from those on other seasons, and the effects of potassium application on potassium. magnesium and water contents of forages. Their is a seasonal difference in the response of mineral and water contents to potassium. Minera] contents in forage possibly show their extremes in the early spring such as April on the present experiment. Namely, the K content of the forage was the highest, while the Mg content was the lowest in April. Other facts worthy to be described were the highest water content and the sensitive response of it to the K fertilization in spring time.
Seasonal Changes of Pasture Production by Cutting Dates and Nitrogen Application Levels under Summer Stress of Cheju Area
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 112~121
To study management practices suitable for the least production loss of temperate pasture under summer stress, two different cutting dates (late June and mid July) under summer stress and five different nitrogen treatment application levels (0, 100. 200, 300 and 400 kg/ha) were tried during the trial period between Oct. of 1986 and Oct. of 1989. The late June cutting showed a statistically significant increase of dry matter yield of pasture in comparison with the mid-July cutting(P<0.05). Nitrogen application also gave significant increase in dry matter yield. Botanical composition at the 4th cuttings in 1988 and 1989 was dominated by weeds to the level of 50%, Application ofnitrogen at 200 kgs per ha was found to be the best with production of grasses at 70%, legumes at 10 % and weeds at 20% in botanical composition comparison of pastures at the 4th cutting time the last year, showing a great decrease of weeds. K contents of pasture in June cuttings showed to be more than them in July cutting, and N and Na contents increased with increases of the nitrogen application level. It was concluded that treatment with June cutting and nitrogen application of 200 kg per ha was a way to keep temperate pasture from summer stress in the Cheju area.
Effect of Winter Annual Forage Crops on Growth , Yield and Quality of Silage Corn
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 122~131
This study was conducted in 1991 and 1992 to determine the effects of winter annual forage corps such as winter rye (Secale cereale L.), rape (Brassica napus subsp. oleifera L.), oats (Auena satiua L.), crimson clover (Trifolium incarnatum L.), vetch (Vicia satiua L.) and Italian ryegrass (Lolim multiflorum Lam.) on subsequent growth, yield and quality of silage corn (Zea mays L.). The winter annual forage crops were seeded at the end of August and harvested in the fall and spring before corn planting. Corn-leaf numbers, plant heights and LA1 were generally reduced during early development when corn followed Italian ryegrass(P<0.05) and winter rye, but the silking date of corn was not affected by the winter annual forage crops. Corn dry matter and TDN yields were significantly reduced when corn followed Italian ryegrass and late maturing Kodiak winter rye. The yield reductions for corn following Italian ryegrass and Kodiak winter rye, relative to corn which did not follow the winter annual forage crops, were 49 and 19% respectively. but the corn yield was slightly improved by 2 and 3%, respectively. when corn followed crimson clover and vetch. No quality differences in corn stover were observed among the treatments except for the lowest ADF and NDF contents and the highest IVDMD where corn followed ltaliabn ryegrass.
Effect of Different Defoliation on Dry and TDN yield of Sorghum Cultivars
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 132~138
Yield and plant constituent responses of forage sorghum cultivars have usually been compared in uniform defoliation management test. However the influence of harvest time on differential response of cultivars needs more precise definition. Therefore this study with sorghum-sorgo-sudan hybrid cv. NC+Sweet Leaf, and Super Su 22 and Sorghum-Sorghum hybrid cv. Pioneer 931 was carried out under two defoliation regimes, namely defoliation at heading stage of each variety and defoliation on the same calendar date in response to heading stage of early variety. The results are summarized as follows; 1. Three harvests were taken by early variety with 80 days and two harvests by late variety with 94 days from sowing to heading. 2. Dry matter and TDN yield tend to be higher when the plants are cut at ear emergence stage of late variety. 3. Crude protein content was similar for the same growth growth stage of 1st growth and 1st regrowth, and rather big different between varieties. 4. Considering only dry matter and TDN yield, it is recommendable to cut two times at ear emergence stage of late variety and also three times at ear emergence stage of early variety in view point of utilization period extension and distribution of forage products.
Effect of Levels of Nutrient on the Growing Performance and Nutrient Intake of Holstein as Influenced by Source of Roughage
Sang Gi Yun ; Hyeun Shup Kim ; Woo Sung Kang ; Jong Hwangbo ;
Journal of The Korean Society of Grassland and Forage Science, volume 13, issue 2, 1993, Pages 139~144
This experiment was carried out to determine the body weight gain, days required to be grown from 100 to 400kg body weight and nutrient intake of thirty growing Holstein heifers fed three different levels of nutrient (80, 100 and 120% of NRC requirement) by two different sources of roughage (corn silage and rice straw). The experiment was arranged as a completely random block design with 5 replications. The results obtained are summarized as follows: I. Average daily weight gain of heifers fed corn silage and rice straw was the highest at 200 and 250kg body weight, respectively. 2. As body weight increased, OM, CP and TON requirement increased-especially requirement of those nutrients being the highest at about 250- 300kg body weight. 3. At 250- 300kg body weight, correlations between body weight(X) and OM, CP and TON intake(l) requirement are the following. DMI = 8.0168X - 0.0209 (r=0.7986
) CPI = 101428X - 0.0145 (r=0.5787
) TDNI = 6.7620X - 0.3702 (r=0.6877