This study was conducted investigate the effect of Gibberellin and Urea on the growth of mulberry tree with the compound treatment, and the characteristic of silkworm when the mulberry leaves simply treated with GB and the compound treatment with GB and Urea were supplied. The results are as follows. 1. Mulberry tree A. The leaf weight per mulberry tree with the compound treatment of GB+ Urea was heavier in spring silkworm and the leaf yield was increased by 7% compared with the non-treatment plot. B. The growth of wattle, leaf length and leaf width was more accelerated in the compound treatment plot of GB+Urea, the single treatment plot of GB and Urea than th!: non-treatment plot in autumn silkworm, and there was observed an incredse yielding effect of 16% in GB+Urea plot, in 16% GB plot and 18% in Urea plot respectively as compared with th: non-treatment plot, hut yield per l000m unit of wattle length was the least in GB plot. C. In the composition of mulberry leaves of treatment, water and crude protein was increased in the compound treatment plot of GB + Urea and the single treatment plot of GB and Urea than the non-treatment plot, but dry matter and carbohydrate were decredsed. 2. Characteristics of Larva in spring silkworm A. The mortality ratio of 4 and 5 instar plot was equally high in the compound treatment plot of GB+ Urea and the pupation ratio of 4 instar plot was lower than other treatment plot. B. Although there was no significant difference observed in the cocoon weight of 10.000 1st-day worms in both 4 and 5 instar plots between each treatment plot, the single treatment plot of GB showed somewhat great than other treatment plots. C. There was no significant difference observed in the cocoon layer ratio between each treatment plot, but 4 instar plots was slightly higher than 5 instar plots. 3. Characteristics of Larva in Autumn silkworm A. The mortality ratio of the compound treatment plot of GB+ Urea and GB was higher than that of the nontreatment and single treatment plot of Urea. B. The pupation ratio of the single treatment plot of Urea was higher than that of the compound treatment plot of GB + Urea, and there was no significant difference observed between other treatment plot. C. The cocoon weight of 10.000 1st-day th instar worms was heavier in the single treatment plot of Urea than nontreatment plot, GB+Urea plot and GB plot. D. The cocoon layer ratio was no significant difference observed between each-treatment.
Chang, Sun Sik;Kwon, Hyuk Jin;Lee, Sang Min;Cho, Young Moo;Chung, Ki Yong;Choi, Nag Jin;Lee, Sung Sill
Journal of Animal Science and Technology
/
v.55
no.1
/
pp.51-59
/
2013
This study was conducted to investigate the dietary effect of total mixed rations (TMR) containing brewers grain, soybean curd and rice straw, respectively, on growth performance and carcass characteristics of Hanwoo steers. Twenty four Hanwoo steers (average body weight 168 kg) in 6 months age were randomly allocated to 4 experimental groups, which contained 6 animals per group during 22-months feeding trial. The treatment was composed of the group fed concentrate and rice straw separately (T1), the group fed TMR containing brewers grain (T2), the group fed TMR containing soybean curd (T3) and the group fed TMR containing rice straw (T4). Body weight (BW) was not different among treatment groups during the growing and middle fattening period. However, it was significantly greater in T4 group than in T2 group on the final BW (p<0.05). Average daily gain was significantly greater in TMR groups compared to T1 group on the growing and late fattening (p<0.05). However, it was not different in total average. Dry matter intake tended to be increased in TMR groups. The feed conversion ratio was significantly lower in T4 group compare to T2 group (p<0.05). According to the yield traits, carcass weight of T1, T2, T3 and T4 were 389.0, 368.4, 387.5 and 384.3 kg, respectively. The back fat thickness, rib-eye area, and yield index were not different among the groups. Meat color, fat color, texture and maturity were not significantly different among groups. However, marbling score and appearance rate of meat quality grade of over $1^+$ were greater in T2 and T3 groups compare to other groups. Therefore, these results indicated that TMR with brewers grain and soybean curd may be ameliorated the growth performance and carcass characteristics of Hanwoo steers.
Journal of The Korean Society of Grassland and Forage Science
/
v.23
no.1
/
pp.37-42
/
2003
This study was conducted at a volcanic ash soil in the Experimental Farm of Cheju national university from May 1, 2000 to August 25, 2000 to determine the optimum frequency of split N application for. forage production of Jeju Italian millet(Setaria italica Beauvis). N .rate was applied with 200kg N/ha, and frequencies of the split application were 1. 2, 3, 4 and f times. Days to heading was 87 days in the N applied plot all at once, was delayed to 93 days at the five times split-applied plot. Plant height was the greatest (143cm) at the four times split-applied plot, but above o. below that was short. Leaf length, number of leaves and nodes were a similar tendency to plant height. SPAD(Soil Plant Analysis Development) reading values rose 34.3∼36.2 as N was split-applied from one to five times. Fresh forage, dry matter, crude Protein and TDN yield at the H split-applied to four times increased 33.08∼5l.50MT/ha, 9.94∼13.36MT/ha, 0.93∼1.70MT/ha and 5.06∼7.28MT/ha, respectively, but at the five tines split-applied plot decreased to 49.33MT/ha, 12.69MT/ha, 1.65MT/ha and 6.98 MT/ha, respectively. As the increasing of N split-applied. crude protein, crude fat NFE and TDN content increased 9.4∼13.0%, 1.5∼l.9%, 44.5∼45.5% and 50.9∼55.0%, respectively, whereas crude fiber and crude ash content decreased 35.3∼31.6% and 9.3∼8.3, respectively.
Seo, Jong-Ho;Moon, Jung-Kyung;Jung, Gun-Ho;Seo, Min-Jung;Heo, Seok-Chul;Gu, Ja-Hwan;Hwang, Chung-Dong;Bae, Hyeon-Kyung;Kim, Sang-Yeol
KOREAN JOURNAL OF CROP SCIENCE
/
v.63
no.3
/
pp.248-256
/
2018
Reduction in the occurrence of weed and erosion of slope soil by living mulch barley simultaneously sown with soybean were investigated at the Upland Experimental Field in Suwon City in 2013 and 2014. The aboveground dry matter of 200-300, 100-200 kg/10a of living mulch barley was obtained at 40 and 60 after sowing, respectively. The occurrence of weeds was significantly reduced by barley living mulch. The early growth of soybean was reduced significantly because of the competition with barley living mulch, but the late growth of soybean after natural drying of barley living mulch was recovered considerably. The soybean grain yield with barley living mulch was similar to that of the normal soybean cultivation, showing no significant difference between no mulch and living mulch treatments. With respect to soil erosion on the slope soil, the amount of run-off water decreased by 20-50% and the amount of soil loss decreased by 70-90% by barley living mulch. The reduction in soil erosion by the use of plastic film + barley living mulch was similar to that of only barley living mulch. The barley living mulch in soybean production can be a promising cultivation technique as it reduces weed occurrence and soil erosion without grain yield reduction.
Kim, Jai-Joung;Hong, Soon-Dal;Choi, Byung-Seon;Park, Jong-Hyun
Korean Journal of Soil Science and Fertilizer
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v.25
no.2
/
pp.143-148
/
1992
Fly ash treatment on soil had a strongly positive effect on the growth of soybean. Treatment of fly ash to the soil made soil pH improved and available phosphate content increased. Consequently yield of soybean increased. From germination to early growth stage, growth status and weight of the plant were unfavorably affected by fly ash and its effects on the leaf was quite serious specially in the plots treated with more than 10 MT/10a of bituminous fly ash. However after early stage, plant growth became vigorous in the order of 0 (control plot)<15<5<10 MT/10a. But at the late maturing stage, deteriorative symptoms such as leaf burn and drying were appeared from the plant treated with 10MT/10a and its symptoms were more serious with 15MT/10a. By anthracite fly ash treatment, the plant growth was greatly improved. As a result plant height and dry matter were in the order of 0<5<10<15MT/10a. Grain yield was in the order of 0<15<5< 10MT/10a treatment with bituminous fly ash and 0<5<10<15MT/10a treatment with anthracite fly ash. As a conclusion, recommandable amount of fly ash treatment for soybean would be 5-10 MT/10a with anthracite fly ash and 5 MT/10a with bituminous fly ash.
Journal of The Korean Society of Grassland and Forage Science
/
v.32
no.2
/
pp.117-124
/
2012
This study was conducted to estimate Hanwoo carrying capacity when whole crop barley or rye as winter forage crops was grown on different applying sources (chemical fertilizer, cattle or organic fertilizer) and mixed sowing combination with hairy vetch or forage pea during the period of 2008~2010. The experimental plots within whole crop barley or rye were consisted of 7 treatments, which were non-fertilizer, chemical fertilizer (P+K), chemical fertilizer (N+P+K), organic fertilizer, cattle slurry, cattle slurry with hairy vetch, and cattle slurry with forage pea. Each plot was triplicates and experimental treatments were allocated in the randomized complete block design. For whole crop barley, annual mean dry matter (DM) and total digestible nutrients (TDN) yields were the highest in N+P+K plots, but there were no significant differences among organic fertilizer, cattle slurry and mixed sowing with legumes. The TDN and RFV were the highest in mixed sowing plots of forage pea plus cattle slurry application. As 450 kg Hanwoo heifers were fed diets included 70% whole crop barley, organic fertilizer, cattle slurry application and mixed sowing with legumes plots is capable of raising average 2.5 to 2.9 heads/ha a year. For whole crop rye, annual DM, crude protein, and TDN yields of application groups and mixed sowing treatment with legumes showed 6.69~7.13, 0.46~0.51 and 3.95~4.18 ton/ha, respectively. In case of 450 kg Hanwoo heifers fed diets included 70% forage rye, it is estimated that cattle slurry application (mixed sowing with legumes) plots can rear average 3.1~3.3 heads/ha a year. It can be concluded that, on the basis of DM yield, not only mixed sowing with legumes by applying cattle slurry rather than single sowing of whole crop barley or whole crop rye enhanced production yield and feed values, but also it could be a substitute for imported grains as dietary protein sources in the case of feeding Hanwoo.
Journal of The Korean Society of Grassland and Forage Science
/
v.39
no.4
/
pp.243-249
/
2019
A barley(Hordeum vulgare L.) cultivar 'Youjin' with hooded spike type having good silage quality was developed at National Institute of Crop Science, RDA in 2016. 'Youjin' showed both high yielding and cold resistance through the preliminary and advanced yield trials(PYT, AYT) from 2012 to 2013. We conducted regional yield trials(RYT) of 'Youjin' in six locations around Korea for three years from 2014 to 2016. It had erect plant type, growth habit of II, the green leaf and hooded awn type. In the paddy field its heading date was April 24 and the maturing date was May 25. Plant height was 99 cm and the number of spikes per ㎡ was 696. It has high rate of leaf blades, resistance to BaYMV(Barley Yellow Mosiac Virus) and good winter hardiness. The average dry matter of Youjin was about 17.2 MT ha-1 in the field. And feed quality of 'Youjin' was 10.6% of crude protein content, 24.8% of ADF(Acid Detergent Fiber), 43.5 % of NDF(Neutral Detergent Fiber), 69.1% of TDN(Total Digestible Nutrients). And also 'Youjin' had grade I of silage quality.
This study was conducted to estimate organic Hanwoo carrying capacity when whole crop wheat and triticale as winter forage crops were grown on different applying sources (no fertilizer, organic fertilizer or cattle slurry), and mixed sowing in combination with hairy vetch and forage pea at the level of 50% cattle slurry application during the period of 2009~2011. The experimental plots were consisted of 5 treatments. Each treatment was triplicates and allocated in the randomized complete block design. For whole crop wheat, annual mean dry matter (DM) yield was significantly (P<0.05) higher for fertilizer application treatments than for no fertilizer treatment, and crude protein (CP) yield was significantly (P<0.05) higher for forage pea and hairy vetch-mixed sowing treatments than for no fertilizer and organic ferilizer treatments. Mean CP, total digestible nutrients (TDN) and relative feed value (RFV) contents of legumes-mixed sowing treatments was significantly (P<0.05) higher than those of other treatments. As diets replaced with 70% whole crop wheat were provided for 450kg of Hanwoo heifers, legumes-mixed sowing treatments could raise more heifers than organic fertilizer and no fertilizer treatments. For triticale, annual mean DM, CP and TDN yields were significantly (P<0.05) higher for fertilizer application treatments than for no fertilizer treatment, and CP content of legumes-mixed sowing and cattle slurry application treatments was significantly (P<0.05) higher than that of other treatments. When 450kg of Hanwoo heifers were fed on diets replaced with 70% triticale, it was estimated that legumes-mixed sowing treatments at the level of 50% cattle slurry application could rear average 3.3~3.4 heads/ha/year, which was significantly (P<0.05) higher than no fertilizer treatment (2.5 heads/ha/year). It was indicated that DM yields of whole crop wheat and triticale were much more effective in cattle slurry application than organic fertilizer, and Legumes-mixed sowing at the level of 50% cattle slurry application rather than whole crop wheat or triticale alone increased yields per unit area and nutritional value such as CP content. In conclusion, it is conceived that whole crop wheat or triticale produced in the manner above can be used instead of grains imported as dietary protein sources in the organic Hanwoo feeding regimen.
This study was carried out to examine the effect of cattle manure and chemical fertilizer application on productivity and nutritive value of silage corn in the reclaimed paddy field of Sukmoon at Dangjin Province in Korea. The cultivars of silage corn used in this experiment were Kwangpyungok and Pioneer (P32B33). The fertilizer was applied according to recommended dose of application. The reclaimed paddy field of Sukmoon was created for farming in 1985 and approximately 5 to 10 years ago rice was cultivated in full-scale. Recently, reclaimed paddy field of Sukmoon has a limitation to cultivate the crops, due to increased salinity caused by drought and poor drainage system. The total area of reclaimed paddy field of Sukmoon was 305 ha, and silage corn was sown on 149 ha of the reclaimed paddy field in nine regions, such as Songsan 28 A and B, Songsan 27 A and B, Songsan 42 A, B and C, and Songsan 43 A and B. The productivity and nutritive value of corn were evaluated collected from each of nine experimental regions. Dry matter (DM) yields of P32B33 in Songsan 28 A and B, and Songsan 27 A were 13 to 15 ton/ha and it was increased 3 to 5 ton/ha as compared to those of Songsan 27 B. DM yields of Kwangpyungok in Songsan 42 A, and Songsan 43 A and B were 23 to 27 ton/ha and it was increased 15 to 16 ton/ha as compared to Songsan 42 A and B. The nutritive value of corn was not significantly different between Kwangpyungok and P32B33, but the yield of Kwangpyungok corn silage was higher compared to P32B33. Therefore, this study suggests that good drainage system is important to maintain normal growth and productivity of corn in the reclaimed paddy field.
Kim, Jong Geun;Li, Yu Wei;Park, Hyung Soo;Kim, Jong Duk
Journal of The Korean Society of Grassland and Forage Science
/
v.37
no.2
/
pp.161-167
/
2017
This experiment was conducted to comparison study on the productivity for certified varieties of import adaptability of silage corn in Pyeongchang area. Total eight varieties (Gangpyeongok, 31N27, 32P75, 32W86, P3156, P3394, DK 689 및 DK 729) were evaluated. The experimental design was 8 treatment of randomized block with three replications. Corn varieties were cultivated in experimental field of Pyeongchang campus, SNU from 1 May to 2 September, 2015 and plot size was $15m^2$. Plant height of 32W86 and ear height of Gwanpyeongok was the highest (p<0.05). Tasseling and silking date was 27 July-3 August and silking occurred after 1-3 day of tasseling. Average day to silking was 92 days and that of 31N27 variety was short (p<0.05). The varieties of DeKalbo Company (DK 689 and DK 729) required more times to silking. Average GDD (growth degree day) of eight varieties was $1,023^{\circ}C$ and P3352 was the lowest GDD. In the trials of resistance evaluation, P3394 was strong in disease, P3156 was the highest in insect. All varieties did not show the lodging and variety of DK 729 showed the highest stay green score (p<0.05). Average dry matter content was 30.77%, it showed higher trend in DM. 32W86 was the highest DM content among the varieties, but there was no significant difference among varieties (p>0.05). The weight per ear was the highest in 32W86 and the lowest in Gwanpyeongok. The ration of ear to whole plant was higher in 32W86 and P3394, but it was not found the significant difference (p>0.05). Average yield of fresh and DM was 59,017 and 13,476 kg/ha, respectively. DK 689 showed higher DM and TDN yield than others, but there was not significant difference (p>0.05). According to results, the difference of productivity was not found among certified variety of import adaptability of silage corn. The varieties Gwanpyeongok, 32W86 and 32P75 would be recommendable in Pyeongchang area for stable cultivation.
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