• Journal of The Korean Society of Grassland and Forage Science
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• v.25 no.4
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• pp.245-250
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• 2005

This experiment was conducted to compare the frech and dry matter yields and feed values of Sorghum$\times$Sudangrsss Hybrid in accordance with different nitrogen and potassium fertilizer sources at the Dae-Ho reclaimed tidal land, Korea from 2003 to 2004. Soil salt contents of ammonium sulfate plots(T3, T4, T5) were higher than that of the urea plot(T2), but that of potassium sulfate plot(T6) was the lowest. The fresh yields of ammonium sulfate plots(T3, T4, T5) and potassium sulfate plot(T6) were higher than that of the urea plot(T2) as $173\%,\;173\%,\;144\%\;and\;90\%$. respectively. The dry matter and total digestible nutrient(TBN) yields were similar tendency like the results of the fresh matter yields. The crude protein(CP), neutral detergent fiber(NDF) and acid detergent fiber(ADF) contents of ammonium sulfate plots(T3, T4, T5) were higher than those of urea plot(T2), but those of potassium sulfate plot(T6) were the lowest. On the other hand, TDN content in potassium sulfate plot(T6) was the highest. It was desirable to use ammonium sulfate$(20\~30kg\;N/10a)$ and potassium sulfate fertilizer$(15kg\;K_2O/10a)$ than those of urea and potassium chloride fertilizer on reclaimed tidal land in view of forage production and its feed value.

• Journal of The Korean Society of Grassland and Forage Science
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• v.37 no.4
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• pp.254-263
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• 2017

This study was carried out to introduce of agronomic characteristics, forage yields and quality of Sorghum ${\times}$ Sudangrass hybrids 'Cadan 99B' and 'Sweet Sioux WMR' from 2015 to 2016 in middle and southern regions of Korea. The field experiment design was complete in seven varieties with three repetitions. Sorghum ${\times}$ Sudangrass hybrids were sown on mid-May in middle region, and end-May in southern region of Korea, in 2015 and 2016. The observed average heading date of Cadan 99B and Sweet Sioux WMR were July 22. The heading dates of Cadan 99B and Sweet Sioux WMR were 8 days earlier than SX-17 and 5 days earlier than brown mid-rid (BMR) Revolution. The sugar contents of Cadan 99B and Sweet Sioux WMR were 6.5 and $6.9Brix^{\circ}$, respectively. Comparison with BMR variety, the sugar contents of Candan 99B and Sweet Sioux WMR were 0.2 and $0.6Brix^{\circ}$ higher than Revolution, respectively. The average of dry matter (DM) yield for 2 years and 2 regions of Cadan 99B (24,587kg/ha) were the highest among the seven varieties, but there was no significant difference among other varieties except headless control variety Jumbo (19,119kg/ha) and LATTE (20,778kg/ha) (p>0.05). The crude protein (CP) and in vitro dry matter digestibility (IVDMD) of Cadan 99B were 7.5% and 60.2%, and Sweet Sioux WMR were 6.9% and 60.7%, respectively. The results of this study indicated that Sorghum ${\times}$ Sudangrass hybrids Cadan 99B and Sweet Sioux WMR are earlier heading dates and higher than SX-17, and high yields of DM in middle and southern regions of Korea.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.1
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• pp.16-24
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• 2010

Effect of flooding on the desalting efficiency and the growth of sudan grass, barnyard grass, sesbania and corn was studied in a sandy soil of the Iweon reclaimed tidal land. Flooding plots were treated by 400 (one time flooding), 800 (two times flooding), and 1,200 mm(three times flooding) of water, respectively, and then soil salinities of the treated plots were compared with salinity of the control plot (not flooded) for estimation of desalting effect. Desalting ratio of 1,200 mm treatment was 78.3% for depth 0-20 cm, 70.5% for depth 20-40 cm and 60.8% for depth 40-60 cm, and then the soil salinity reached at 3~6 dS $m^{-1}$. Consequently, it was considered that sandy saline soil was satisfactorily desalted for upland crops to be cultivated by 1,200 mm flooding, but insufficiently desalted by 400 mm and 800 mm flooding because of high salinity ranged 5~14 dS $m^{-1}$ even after flooding treatment. In addition, it was estimated that soil salinity should be controled lower than 7.7 dS $m^{-1}$ in order to obtain more than 80%of crop emergence when four crops are simultaneously cultivated by inter- or mixed cropping in a field. Dry matter yields (kg $10a^{-1}$) was 1,068 for sudan grass, 696for barnyard grass, 1,426 for sesbania, and 1,164 for corn by 1,200 mm flooding treatment, but only 46.8~74.3% by 800 mm flooding treatment and 2.9~25.5% by 400 mm flooding treatment. Therefore, it is concluded that the flooding treatment more than 1,200 mm is necessary for satisfactory desalinization in order for the low salt tolerance crops to be cultivated in the sandy reclaimed tidal land.

• Journal of The Korean Society of Grassland and Forage Science
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• v.14 no.1
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• pp.34-41
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• 1994

This experiment was carried out to select the $Sorghum{\times}Sudangrass$ hybrid of high productivity suited for soiling, and growth characteristics and productivity of 9 cultivars of introduced $Sorghum{\times}Sudangrass$ hybrids have been evaluated at the experimental forage field, College of Natural Science of Kon-Kuk university in Chungju over three years. The results obtained are summarized as follows : 1. NC855, Sordan79 and T. E haygrazer were taller than the other varieties as range from 209cm to 213cm. while Supergrazer was the shortest type as 173cm. Among the nine varieties used, NC855 and Pioneer 988 were classified as early maturing varieties, but G83F, FP5 and Supergrazer were classified as lately maturing varieties. 2. The stem diameter of Supergnzer and Sordan79 were thicker than the other varieties, while NC855, Garst757 and FP5 were thin. 3. The tillers of $Sorghum{\times}Sudangrass$ hybrids were ranged from 3.1 to 4.0 and NC855 and FP5 had 4.0 tillers per plant. The dead stubble of Sordan79 was the lowest as 4.0 percentage, while Supergrazer was the highest as 9.8 percentage(P<0.05). 4. GW9110G and T. E haygrazer were susceptible to lodging(P

• Journal of The Korean Society of Grassland and Forage Science
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• v.32 no.1
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• pp.29-38
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• 2012

This study was carried out to compare the agronomic characteristics, forage yield, and feed value of nine sorghum ${\times}$ sudangrass hybrids at paddy field cultivation. The nine recommended sorghum ${\times}$ sudangrass hybrids used in this study were P877F, Cow pow, Turbo gold, Maxi graze, Jumbo, G7, Sweet home, Honey chew BMR and Green star. Plant height, leaf number, stem diameter, and stem hardness were higher in Jumbo than other varieties (P<0.01). Sugar content (brix) was higher in order of P877F > Sweet home > maxi graze > Green star > Cow pow > G7 (P<0.01). Fresh (86,199kg/ha) and dry matter yield (16,206 kg/ha) of Jumbo were higher than other varieties (P<0.01). Crude protein was the highest in Maxi graze (6.5%), but crude fat was the highest in Honey chew BMR as 2.1% (P<0.01). NDF and ADF of Jumbo and G7 were higher than other varieties (P<0.01). TDN was higher in order of Maxi graze > Sweet home > P877F > Honey chew BMR > Green star, but no significant differences were found among the varieties. Minerals were the highest in Cow pow (15,020.5 mg/kg), and Sweet home (6,222.6 mg/kg) was the lowest as compared to other varieties (P<0.01). Total amino acids were higher in order of Maxi graze > Sweet home > Turbo gold > Honey chew BMR > Jumbo (P<0.01). Crude protein yield and crude fat yield were the highest in Turbo gold (814.6 kg/ha) and Honey chew BMR (309.8kg/ha), respectively (P<0.01). Mineral yield was the highest in Cow pow as 207.6 kg/ha (P<0.01). Amino acid yield (592.2 kg/ha) and TDN yield (10,194 kg/ha) were the highest in Sweet home. Based on the above results, sorghum ${\times}$ sudangrass hybrid varieties should be selected on the basis of the purpose of use. Because, each varieties showed various growth characteristics and nutrition yield (protein, fat, mineral, amino acid, TDN).

• Journal of The Korean Society of Grassland and Forage Science
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• v.39 no.2
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• pp.81-88
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• 2019

This study was carried out to investigate the growth characteristics, yield and feed value of Sorghum${\times}$Sudangrass hybrid for silage according to the drainage depths in the paddy field of lowland. The experimental design was arranged in a randomized block design with four treatments and three replication. The drainage depths of four treatments were 0cm, 20cm, 40cm and 60cm, respectively. Plant length, leaf length and leaf number were not significantly different, but leaf width increased as the higher the drainage depth(p<0.05). The number of dead leaf was higher in the order of $60cm>0cm{\geq}40cm{\geq}20cm$ treatment(p<0.05). Green degree was higher in the order of 20cm > 40cm > 0cm > 60cm treatment(p<0.05). Stem diameter and stem hardness increased significantly as drainage depth increased from 0cm to 60cm(p<0.05). Also, fresh yield, dry matter yield and TDN yield increased as the higher the drainage depth(p<0.05). Crude protein and TDN content were the highest in 40cm treatment(p<0.05). Crude ash was higher in the order of 20cm > 40cm > 0cm > 60cm treatment(p<0.05). ADF and NDF content were the highest in 0cm treatment(p<0.05). Total mineral content was higher in the order of 20cm > 0cm > 40cm > 60cm(p<0.05). Free sugar content(fructose, glucose and sucrose) was the highest in 0cm treatment(p<0.05). Total amino acid(EAA+NEAA) was higher in 40cm than the other treatments(p<0.05). There is a difference in the content of ingredients(crude protein, TDN, mineral, free sugar and amino acid) according to the treatments. But considering dry matter yield and TDN yield, Sorghum${\times}$Sudangrass hybrid cultivation is advantageous to set the drainage depth of about 60cm in the paddy field of lowland.

• Journal of The Korean Society of Grassland and Forage Science
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• v.43 no.1
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• pp.22-27
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• 2023

This experiment was conducted to confirm the possibility of preparing Sorghum×sudangrass hybrid artificial hay using far-infrared rays in Korea. The machine used in this experiment is a drying device based on far-infrared rays, and is designed to control temperature, air flow rate, far-infrared radiation amount, and air flow speed. The Sorghum×sudangrass hybrids harvested in late September were wilted in the field for one day, and a drying test was performed on them. Conditions for drying were performed by selecting a total of 7 conditions, and each condition induced a change in radiation amount in a single condition (42%) and two steps (4 treatments) and three steps (2 treatments). The speed of the air flow in the device was fixed at 60 m/s, and the run time was changed to 30, 60, and 90 minutes. The average dry matter (DM) content was 82.84%. The DM content was 59.94 and 76.91%, respectively, in drying conditions 1 and 3, which were not suitable for hay. In terms of drying rate, it was significantly higher than 80% in the 5, 6 and 7 treatment, and power consumption was slightly high with an average of 5.7 kw/h. As for the feed value according to each drying condition, the crude protein (CP) content increased as the drying time increased, and there was no significant difference between treatments in ADF, NDF, IVDMD and TDN content. In terms of RFV, treatment 1, which is a single condition, was significantly lower than the complex condition. Through the above results, it was determined that the drying conditions 4 and 5 were the most advantageous when considering the drying speed, power consumption, and quality.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.5
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• pp.650-658
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• 2010

We used green manure crops such as hairy vetch, crimson clover, rye, sorghum, and sudan grass by mixing with soils to assess the effects of green manure crops on nutrient supply and soil quality improvement. Temporal changes in soil inorganic nitrogen, carbohydrate, microbial biomass, and humus content were determined as soil quality indicators. Inorganic nitrogen content of the control maintained similar level during the whole period, but it had continually increased until 4 weeks after incorporation (WAI) of green manure crops. Especially, inorganic nitrogen content sharply increased in sudan grass. After incorporation of green manure crops, temporal change of soluble sugar in soils was as follows: it had gradually increased in legume green manure crops-incorporated soils until 7 WAI, which was the highest, and then showed the tendency to be reduced. Meanwhile, it in non-legume green manure crops-incorporated soils rapidly increased after the incorporation, and reached the maximum around 4 WAI. Humic acid by the decomposition of crop residues in green manure crops-incorporated soils was greatly enhanced with the elapsed time of 4 WAI, although it was low at the same level as the control until 2 weeks. In addition, there was a difference in fulvic acid by incorporated crops, fulvic acid in hairy vetch, sorghum and sudan grass showed a similar tendency with the change in humic acid. Our results suggest that soluble sugar, microbial activity and humic acid could be available indicators to evaluate the fertility of green manure crops-incorporated soils.

• Journal of the Korea Organic Resources Recycling Association
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• v.25 no.4
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• pp.23-29
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• 2017

This experiment was carried out to compare the productivity and feed value between standard cultivation and organic mixed expeller cake fertilizer cultivation to develop organic cultivation technology except from standard cultivation using chemical fertilizers in the field of forage production. This study was conducted in the rice field of Livestock Research Institute Jacheon-myeon, Gangin-gun Jellanam-do. Organic mixed expeller cake fertilizer consists of 4.0% nitrogen, 65% castor, 30% seeds and 5% fish meal. Sorghum-Sudangrass Hybrids(SX17) was sowed 40kg per hectare on May 25. Test group formation was consisted of a standard group and test treatment. The standard group(Con.) was fertilized chemical fertilizer according to the N-P-K kg/ha, 200-150-150 (basal 100kg, uptake 100kg). Test treatment was carried out organic fertilizer 100%(T1), organic fertilizer 150%(T2) and organic fertilizer 200%(T3) according to the nitrogen content of standard group(Con.). Plant height of harvest time depending on the treatment was that Con was 317cm, T1 was 252cm, T2 was 269cm and T3 was 293cm. Dry matter yield was that Con was 11,386kg/ha, T1 was 6,015kg/ha, T2 was 6,799kg/ha, T3 was 7,627kg/ha. In the test treatment, plant height and dry matter yield increased with increasing fertilizer. Crude protein was the height in Con(7.0%) and Crude protein of test treatment was T1(5.7%), T2(6.3%), and T3(5.1%). As a result of this study, T2 was recommended.

• Journal of The Korean Society of Grassland and Forage Science
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• v.32 no.3
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• pp.293-300
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• 2012

This experiment was carried out to compare the agronomic characteristics, forage yield and quality of sorghum ${\times}$ sudangrass hybrid at two locations (Sungju and Cheonan) in 2009. The experiment was a randomized complete block design with three replications. The eight recommended hybrids used in this experiment were 'Sordan 79', 'SX17', 'Honey chew', 'Honey grazer', 'G7', 'Jumbo', 'Green star' and 'GT56' hybrids. The heading of four hybrids were headed at both region, Sungju and Cheonan. There are no big differences in general agronomic characteristics among hybrids, but brix scale of heading and BMR (brown mid rib) types were higher than those of other hybrids. Dry matter (DM) and plant height of heading type hybrids were higher than those of headless types. The fresh, DM and TDN (total digestible nutrients) yields of heading type hybrids were also higher than those of headless types, and BMR types were lower than others. The crude protein and crude ash contents of headless hybrids were higher than those of heading hybrids, while its non-fiber carbohydrate (NFC) content showed the opposite results. The acid detergent fiber (ADF) and NFC contents of BMR types were lower than others. The results of this experiment indicates that heading hybrids were more higher than headless hybrids in the agronomics and forage yield of sorghum ${\times}$ sudangrass. However heading types were lower headless types in quality of sorghum ${\times}$ sudangrass. And BMR hybrids were also high quality of sorghum ${\times}$ sudangrass hybrid because of higher brix content and lower ADF content among tested hybrids.