The objectives of the study were to investigate the effects of foliage clipping on photosynthesis and grain filling for branch and non branch types under the polyethylene film mulch and non mulch conditions in mono cropping and second cropping after barley in sesame (Sesamum indicum L.), and to improve poor grain filling at later flowering time utilizing these data. One thousand grain weight was more decreased in branch type than in non branch type, in polyethylene film mulch condition than in non mulch condition, and in second cropping after barley than in mono cropping by clipping lower part foliage. Twentyfive percent clipping of lower part foliage showed a little increase than no clipping. Matured grain rate also showed same tendency between branch and non branch type and between mono cropping and second cropping after barley as well as 1,000 grain weight except for polyethylene film mulch. Matured grain rate of 25% foliage clipping at 30 days after flowering in non branch type presented a little increase but decreased in branch type. Clipping of higher part leaves were so serious decrease of matured grain rate that higher part leaves at late maturing time have a major role in photosynthesis. Matured grain rate of foliage clipping at 10 days after flowering was decreased in all treatments. Chlorophyll content of higher part leaves at 50% lower part foliage clipping presented 39% increase compared to same positioned leaves of non treatment, and 66% increase by 50% higher part foliage clipping in lower part leaves. Photosynthetic activity was 58% more increased in 50% lower part foliage clipping than no clipping, but seriously decreased in 50% higher part foliage clipping. Therfore, photosynthates of remained lower part leaves could not only support their own demands, but also any contribution to translocation of photosynthates from source to sink at late maturing time. Harvest index was 28% increased in 25% lower part foliage clipping and 13% decreased in 50% higher part foliage clipping compared to no clipping. Leaf area was 48% increased in 50% lower part foliage clipping compared to the same positioned leaves of no clipping, and only 5% increased in higher part foliage clipping. Productivity by foliage clipping compared to non treatment, was highly decreased in branch type than in non branch type, in second cropping after barley than in mono cropping. Little difference was detected between polyethylene film mulch and non mulch conditions. Twenty five percentage of lower part foliage clipping on mono cropping of non branch type appeared 5% and 8% yield increase in each of polyethylene film mulch and non mulch conditions compared to no clipping, and all decreased in other treatments. Mean loss of productivity by foliage clipping at 10 days after flowering was serious than clipping at 30 days after flowering. As the result, contribution to photosynthesis of source at 10 days after flowering are larger than that at 30 days after flowering in sesame. Fifty percent lower part foliage clipping at 10 days after flowering showed so the most serious yield decrease that lower part leaves at that time were considered as the main role leaves for photosynthesis.
This experiment was conducted in an attempt to find the variation of growth, yield components and .yield in accordance with different seeding rate and fertilizer level. The degree of yield increase by increased fertilizer level was higher in heavy spike type .than in high tiller type. but that by increased seeding rate was the reverse in barley and wheat. 1, 000 .grains weight and maturity was increased by increased fertilizer level in heavy spike type (Haganemugi and Young Kwang) but decreased in high tiller type (Suweon #165 and Yuk Seung#3).
Two soybean cultivars different in plant type, Hwanggeumkong and Suweon-125, were planted under two different planting densities to investigate the proper planting densities after barley crops. The results obtained are summarized as follow: 1. No apparent varietal differences due to the planting densities were observed in flowering time and maturity. 2. The number of nodes of main stem showed significant differences between plant types, while they were not significantly different between planting densities. The number and length of branches per plant were apparently decreased as the planting densities were higher. 3. The number of pods per plant, and number and weight of grain per plant decreased as the planting densities increased and they showed also significant differences between planting densities. However, the number of pods, and number and weight of grain per unit land area were increased as the planting densities increased. 4. The grain yield per 10a showed significant cultivar difference under different planting densities. The Hwanggeumkong, determinate type, showed highest grain yield at the planting densities of $60{\times}7.5cm$, while Suweon-125, indeterminate type, highest at the planting densities of $60{\times}5.0cm$.
Although the young spike of barley (Hordeum vulgare L.) or wheat (Triticum aestivum L.) is known as the most susceptible part to spring cold injury, the risk of cold injury is apt to be ignored in most breeding program due to the importance of early maturity. Based on these aspects, the types and inducing time, temperature conditions for induction and effects of cold injury on growth and yield in this study were investigated under greenhouse and field conditions through three years (1997-1999). In natural condition, low temperature around -2.4∼$-10.2^{\circ}C$ caused the death of plant. Several cold injury types such as partial degeneration of spike, partial discoloration of leaf, spike and awn, discoloration of culm and white spike were observed at low temperature around $-3.1^{\circ}C$. Low temperature around -2.4∼$-8.6^{\circ}C$ and 1.3-$7.6^{\circ}C$ caused degeneration and sterility of spike, respectively. Most materials were prepared to the spikelet foundation stage, spikelet differentiation stage, development stage of flower organ, booting stage and heading stage, which were known having risk for cold injury in field condition. Although most of the controlled stages were sensitive to the induced low temperature, booting stage was the most sensitive stage for cold injury. All of growth stages which were treated-heading stage, booting stage, development stage of flower organ, spikelet differentiation stage, spikelet foundation stage-were responded to low temperature treatment but the symptoms revealed were very specific according to the growth stages. Ears of plant in heading stage were discolored to white. Ears of plant in booting stage were degenerated in all or part of one. Plants in spikelet differentiation stage were sterile in all or part of one. When tried to detect the specific differences between normal and cold injured plants in appearance, spike length, distance between spike and flag leaf and the first internode length could be the critical points for occurrence of spike death caused by cold injury. In barley, the elongation of spike was stopped on 3.2cm after occurrence of spike degeneration, 4.7cm after occurrence of partial degeneration of spike, 5.0cm after occurrence of white spike. In wheat, it was stopped on 1.6cm after occurrence of stem death, 3.3cm after occurrence of spike degeneration, 8.3cm after occurrence of partial degeneration of spike, 8.1cm after occurrence of white spike, 7.5cm after partial discoloration of leaf and 9.3cm after partial discoloration of spike. The obtained results from low temperature treatment induced in growth chamber were similar to the field experiment, Beacuse the death of spikes was more when low temperature was treated two times than one times, the temperature should be upgrade to -3$^{\circ}C$ in order to get the same condition with field test.
Kim, Sung-Kook;Jung, Gun-Ho;Shin, Sung-Hyu;Kim, Min-Tae;Kim, Chung-Guk;Shim, Kang-Bo
KOREAN JOURNAL OF CROP SCIENCE
/
v.61
no.4
/
pp.290-296
/
2016
Green manure has been used as alternative to chemical fertilizer. To evaluate the effect of green manure on the chemical properties of top-soil and sorghum yield, hairy vetch (Vicia villosa Roth, HV), manure barley (MB), and a mixture of hairy vetch and manure barley (HV+MB) were incorporated into the soil at a rate of $100kg-N\;N\;ha-1$ before the sorghum was transplanted. Total biomass of sorghum grown in the HV, MB, and HV+MB treatments was 13.1, 31.6, and $25.2t\;ha^{-1}$, respectively, and the nitrogen production of the treatments was 81, 74, and $145kg\;ha^{-1}$, respectively. The SPAD value of the uppermost leaf of sorghum plants grown in the soils with HV, MB, or HV+MB were very similar until heading stage; however, at maturity, the SPAD value of sorghum cultivated in the soils with HV was lower than that of sorghum in the soils with MB or HV+MB. This could be because the nitrogen release from HV was too rapid to supply nitrogen to sorghum during the later stage of grain filling. Compared with chemical fertilizers, the incorporation of green manure increased the pH, exchangeable cations ($K^+$, $Mg{^{+}^{+}}$, and $Ca{^{+}^{+}}$), and total nitrogen in soil postharvest, indicating an improvement in soil chemical properties. Total carbon content increased in soil with green manure incorporated, but decreased in the chemical fertilized soil, suggesting that sorghum cultivation using green manure may sequester carbon in soils. The yield of sorghum cultivated with green manure was not different from the yield of sorghum cultivated with chemical fertilizers. These results suggest that the mixture of hairy vetch and manure barley can be a useful chemical fertilizer alternative in sorghum cultivation.
Journal of The Korean Society of Grassland and Forage Science
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v.15
no.3
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pp.198-206
/
1995
Baled silage making(BS) of selected forage crops was discussed during 1991-1993, to determine the best cutting time of the plants for BS production, BS yields and silage quality. Seven species of forage crops and pasture grasses(rye, barley, spring oat, Italian ryegrass, orchardgrass, alfalfa and grass-legume pasture mixtures) were harvested at different stage of growth from young plant to physiological maturity, and baled in a self constructed square baling chamber. Each bales, measured 90cm length, 60cm width and 50cm height, were wrapped with 0.05mrn thick polyethylene plastic film, and stored in stack silo. Each bales were weighed between 15-20 kg in dry matter basis. The effects of pre wilting and formic acid addition on the silage quality of young plant materials, which contained high water concentration, was also evaluated during the experiment. Rye plant including of barley and spring oat were evaluated as a good materials for baled silage making. Fodder rye produced high quality BS with a value of silage quality point 84(Flieg's point) when the plant harvested at stage of greatest dry matter accumulation by 12.64 tonha. The best quality BS of barley was obtained at stage of hard dough to yellow stage by 11.9 ton/ha dry matter yield and 81 point silage quality. Italian ryegrass and pasture grasses including of orchardgrass, alfalfa and grass-legume pasture mixtures procuced also high quality bale silage by harvesting at stage of late blooming. However pre witting operation and formic acid addition was required for BS production of grass materials because of high water contents. Water contents of Italian ryegrass and other pasture species ranged 18.9%(Italian) to 20.8%(alfalfa). Silage quality point of Italian BS harvested at late blooing was increased from 72 to 88 by 1/2-one day pre wilting and 0.3% formic acid treatment. Silage quality of young plant materials of rye and other forage crops, barley and spring oat were also improved markedly through the pre wilting treatment and formic acid addition.
This study was conducted to clarify progressed changes of plant types and the effects of the physiological and ecological components on improving ideotype of winter wheat. 12 wheat varieties were planted at the experimental farm of Wheat and Barley Research Institute in Suwon in 1990. As results of intensive wheat breeding for early maturity since 1959, heading, flowering and maturing dates have been shortened by 17, 15 and 14 dagys, respectively. The shortened days from sowing to heading and from heading to flowering contributed to the early maturity to improved. Physiological factors associated with heading time of wheat could be reprsented by growth habit, photoperiod responses, earliness in narrow sense and winter hardiness. For improving an early maturity of winter wheat, it would desired to maintain some degree of winter habit(III-IV), and recombination of more insensitivity to short day length and more shortened earliness in narrow sense than that of Saemil and Chugoku 81, and higher degree of winter hardiness. For improving the early maturity the more effective way must be of shortened days from sowing to heading, and days from flowering to maturity than days from heading to flowering. Ideotype of wheat will be desired to recombine two semi-dwarf genes with erect plant type being about 70-80cm, less stem elongation by late spring, long spike and many grains per spikelet. Average spike weight ratio was about 45-49% in high-yielding varieties, stem fresh weight was lighter, but spike fresh weight was heavier in new one while leaf fresh weight was similar to each other during the maturing periods. Average spike dry weight ratio was higher about 40~48%, and stem and leaf blade dry weights were lower in the newly bred varieties. Stem dry weight was heavier than spike or leaf dry weight in the old varieties of Yungkwang, Jangwang and Jinkwang. Leaf area index for the varieties showed normal distribution curve as the maximum point in booting stage. The maximum point of this curve come in early maturing wheat, and late in old one. The maximum points of LAI were 6.4~6.8 in the high-yielding varieties. Totals of LAI in each period investigated of old one were higher than those of newly bred being 24.6~28.8. Chlorophyll content of the high-yielding varieties of Chokwang, Geurumil and Saemil as higher than that of the old varieties Jangkwang, Jinkwang, Wonkwang and Sinkwang from regrowing period to April 21. after then slightly and even after heading. Net assimilation rate (NAR) was higher in high-yielding varieties with good plant type, and lower in old ones. Grain yield of the newly released varieties increased rapidly but slowly in the old ones. Change in water content of grain at the growing stage in newly bred was lower than that of the old bred. Diminishing rate of water content of grain in establishment per day was 1.2% average that of the old varieties including Yungkwang was 1.5%, and those of the newly bred including Chokwang were 0.9~1.1%. Chokwang, Naemil, and Saemil were the highest-yielding varieties of the Korean cultivars. Yields were increased by spikes per m$^2$, grain weight for the varieties bred in Suwon, and by spikes per m$^2$ for the varieties bred in Milyang.
Experiments were conducted in the research field of the Wheat and Barley Research Institute with three barley cultivars, Olbori, Kangbori and Suwon 18, which showed different growth characteristics. The highest rates of daily dry matter accumulation in grains were 1.03 1.94 mg / grain / day in early and optimum sowings and 0.88 1.88 mg / grain / day in late sowings, which occurred around 20~30 days after heading in early and optimum sowings and 15~20 days after heading in late sowings. Grains reached their maximum weight by 40 days after heading in early and optimum sowings and 35 days after heading in late sowings. Total sugar content in grains followed a pattern of linear increase immediately after heading, but it started to decrease around 20 days after heading. On the other hand, starch content continued to increase until maturity. The contents of both components were high in the order of 'Olbori' > 'Kangbori' > 'Suwon 18', but they did not respond in a regular pattern to different sowings. 1,000 grain weight showed highly significant positive correlation(r=0.767$^{**}$) with the duration of grain growth, but it had negative correlations with the average (r=-0.548$^{**}$) or the sum (r=-0.595$^{**}$) of post-anthesis daily mean temperature.ature.
Journal of The Korean Society of Grassland and Forage Science
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v.28
no.1
/
pp.41-48
/
2008
This study was carried out investigate the effects of dietary supplementation of agricultural by-product feed(persimmon-pell+barley bran+fermented rice bran+activated carbon) on calves disease, growth and carcass characteristics of Korean native steer. A total of twenty Korean native steer were allocated into four feeding group and assigned to four dietary treatments: Control(normal concentrate as a basal diet), T1(1% addition of by-product feeds), T2(3% addition of by-product feeds) and T3(5% addition of by-product feeds). The calf diarrhea was the highest at Control, while T3 was the lowest. The breath disease was the lowest at T2, occurrence with diarrhea and breath disease was the highest at Control. The daily gain was orderly ranked as T2(0.76kg)>T1(0.7kg), T3(0.70kg)>Control(0.67kg). The back fat thickness was orderly ranked as T2>T3>Control>T1, eye muscle area was orderly ranked as T3>T1>Control>T2. Grade of meat quantity was the highest at T1(2.3), but fat color, firmness and maturity tends to have a similar result. The marbling score and quality grade of T2 were the highest at 5.0 and 3.5, respectively. Based on the study, agricultural by-product feeds are able to many used for various purposes at disease reduce, increment of meat quantity and improvement of quality grade.
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
/
v.13
no.1
/
pp.66-77
/
1993
The experiment reported here was conducted at Suweon and Sunghwan. to evaluate desirable agronomic characteristics, forage yield and quality of nine introduced oat (Avena sativa L.) cultivars in 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 lodging than the control cultivar under rainy growing conditions and Taiho, Zenshin and Hay oat were more susceptible to barley yellow dwarf virus among the cultivars tested. At Suweon, the early type cultivars Speed oat and G-sprinter significantly outyielded the control cultivar Cayuse over the 3 years of the fall experiment, but no significant forage yield was found between 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 in the fall experiment of 1991, but the 3 years of experiment showed no significant difference in the forage yield of oat cultivars in the spring experiment. Over the 3 years of the fall and spring experiments at both Suweon and Sunghwan. the crude protein (CP) content and in vitro dry matter digestibility (IVDMD) of the early types Speed oat and G-sprinter were lower than those of the control and late types, but the acid detergent fiber (ADF) and neutral detergent fiber (NDF) contents of the early types Speed oat and G-sprinter were slightly higher than those of the control and late types. Results of this experiment indicate that the early type oat cultivars tended to higher forage yield than the late types when sown in the fall, but no cultivar differences in dry matter yield were found when sown in the spring.
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