Fig. 1. Influence of planting density on the seasonal patterns of stem length (A), diameter (B), and number of additional tillers (C) of the sweet sorghum cultivar ‘Chorong’ in 2018. Vertical bars represent standard error of the means (n = 15). Legend in the graph indicates planting density (PD) and the unit is number of plants per square meter. The dotted line represents heading date (71 days after sowing).
Fig. 2. Correlation between plant density and lodging index at 30 days after heading date of the sweet sorghum cultivar ‘Chorong’. Lodging index is the indexed value of percentage.
Fig. 3. Scatter plot matrix and Pearson’s coefficient between growth and yield characteristics surveyed at harvest period of the sweet sorghum cultivar ‘Chorong’. Plant density (PD), stem length (SL), stem diameter (SD), number of nodes (Node), soluble solids content (SSC), moisture contents of stem (MCS), dry matter (DM), fresh stem yield (FSY), dry stem yield (DSY), conservative sugar yield (CSY), juice yield (JY), sugar yield (SY). **P ≤ 0.01, *P ≤ 0.05 represent significant values (n=75).
Fig. 4. Scatter plot of growth and yield characteristics from principal components analysis at harvest period of the sweet sorghum cultivar ‘Chorong’. Plant density (PD), stem length (SL), stem diameter (SD), number of nodes (Node), soluble solids content (SSC), moisture contents of stem (MCS), dry matter (DM), fresh stem yield (FSY), dry stem yield (DSY), conservative sugar yield (CSY), juice yield (JY), sugar yield (SY).
Table 1. Effect of planting density on yield components at harvest (50 days after heading) of the sweet sorghum cultivar ‘Chorong’.
Table 2. Effect of planting density on sugar contents in juice at harvest (50 days after heading) of the sweet sorghum cultivar ‘Chorong’.
Table 3. Principal component (PC) analysis results of growth and yield characteristics of the sweet sorghum cultivar ‘Chorong’.
References
- Ahn, S. H., S. S. Nam, J. K. Bang, C. Y. Yu, Y. H. Choi, Y. H. Moon, S. T. Bark, Y. L. Cha, B. C. Koo, and K. G. Park. 2012. Characteristics of sweet sorghum germplasms for bioethanol production. Kor. Soc. Internat. Agric. 24(1) : 32-35.
- Almodares, A., R. Taheri, and S. Adeli. 2008. Stalk yield and carbohydrate composition of sweet sorghum (Sorghum bicolor (L.) Moench) cultivars and lines at different growth stages. Malays. Appl. Biol. 37(1) : 31-36.
-
Anten, N. P. R., F. Schieving, E. Medina, M. J. A. Werger, and P. Schuffelen. 1995. Optimal leaf area indices in
$C_3$ and$C4_4$ mono- and dicotyledonous species at low and high nitrogen availability. Physiol. Plant 95 : 541-550. https://doi.org/10.1111/j.1399-3054.1995.tb05520.x - Bian, Y., S. Yazaki, M. Inoue, and H. Caih. 2006. QTLs for sugar content of stalk in sweet sorghum (Sorghum bicolor (L.) Moench). Agric. Sci. China 5(10) : 736-744. https://doi.org/10.1016/S1671-2927(06)60118-1
- Bok, T. G., M. S. Lee, W. S. Shin, J. H. Ryu, and H. B. Lee. 2010. Major characters of the developed sweet sorghum lines induced by mutagene, gamma-ray. Kor. J. Agric. Sci. 37(3) : 351-354. https://doi.org/10.7744/cnujas.2010.37.3.351
- Carpita, N. C. and M. C. McCann. 2008. Maize and sorghum: genetic resources for bioenergy grasses. Trends Plant Sci. 13(8) : 415-420. https://doi.org/10.1016/j.tplants.2008.06.002
- Choi, Y. H., Y. H. Moon, S. H. Ahn, Y. M. Yoon, Y. L. Cha, B. C. Koo, K. G. Park, H. S. Han, and W. S. Kim. 2012. Characteristics of sweet sorghum germplasm for bioethanol production in reclaimed soil. Kor. J. Crop. Sci. 57(4) : 384-388. https://doi.org/10.7740/kjcs.2012.57.4.384
- Cipollini, D. F. and J. Bergelson. 2001. Plant density and nutrient availability constrain constitutive and wound-induced expression of trypsin inhibitors in Brassica napus. Journal of Chemical Ecology. 27 : 593-610. https://doi.org/10.1023/A:1010384805014
- Cusicanqui, J. A. and J. G. Lauer. 1999. Plant density and hybrid influence on corn forage yield and quality. Agronomy Journal 91 : 911-915. https://doi.org/10.2134/agronj1999.916911x
- Dai, J. L., W. J. Li, W. Tang, D. M. Zhang, Z. H. Li, H. Q. Lu, A. E. Eneji, and H. Z. Dong. 2015. Manipulation of dry matter accumulation and partitioning with plant density in relation to yield stability of cotton under intensive management. Field Crops Research. 180 : 207-215. https://doi.org/10.1016/j.fcr.2015.06.008
- Dar, W. D. 2006. Sweet sorghum: A new smart biofuel crop that ensures food security. International Crops Research Institute for Semi-Arid Tropics (ICRISAT) Reports. 1-5.
- Dong, H. Z., W. J. Li, A. E. Eneji, and D. M. Zhang. 2012. Nitrogen rate and plan density effects on yield and late-season leaf senescence of cotton raised on a saline field. Field Crops Res. 126 : 137-144. https://doi.org/10.1016/j.fcr.2011.10.005
- Fedenko, J. R., J. E. Erickson, and M. P. Singh. 2015. Rood lodging affects biomass yield and carbohydrate composition in sweet sorghum. Industrial Crops and Products. 74 : 933-938. https://doi.org/10.1016/j.indcrop.2015.06.018
- Gibson, S. 2009. Bioenergy crops "Sweet sorghum". Advanta Seeds Ltd. Austrilia. 1-7.
- Gnansounou, E., A. Daurial, and C. E. Wyman. 2005. Refining sweet sorghum to ethanol and sugar: economic trade-offs in the context of North China. Bioresource Technol. 96 : 985-1002. https://doi.org/10.1016/j.biortech.2004.09.015
- Han, T. K. and S. T. Yoon. 2017. Effect of planting distance and seeding date on the tiller occurrence, growth characteristics of sorghum (Sorghum bicolor L.) resources. Kor. J. Plant Res. 30(4) : 427-434. https://doi.org/10.7732/KJPR.2017.30.4.427
- Hiltbrunner, J., B. Streit, and M. Liedgens. 2007. Are seeding densities an opportunity to increase grain yield of winter wheat in a living mulch of white clover?. Field Crops Res. 102 : 163-171. https://doi.org/10.1016/j.fcr.2007.03.009
- Lee, I., H. Y. Sin, S. O. Kim, H. K. Park, and O. D. Kwon. 2004. Growth and yield of paddy rice as affected seeding method and planting density under the upland condition. Kor. J. Intl. Agri. 16(3) : 214-221 (in Korean).
- Leskovsek, R., A. Datta, A. Simoncic, and S. Z. Knezevic. 2012. Influence of nitrogen and plant density on the growth and seed production of common ragweed (Ambrosia artemisiifolia L.). J. Pest Sci. 85 : 527-539. https://doi.org/10.1007/s10340-012-0433-2
- Martin, P. M. and F. M. Kelleher. 1984. Effects of row spacing and plant population on sweet sorghum yield. Austral. J. Exp. Agric. 24(126) : 386-390. https://doi.org/10.1071/EA9840386
- Naoyuki, T. and Y. Goto. 2004. Cultivation of sweet sorghum (Sorghum bicolor (L.) Moench) and determination of its harvest time to make use as the raw material for fermentation, practiced during rainy season in dry land of Indonesia. Plant Prod. Sci. 7 : 442-448. https://doi.org/10.1626/pps.7.442
- RDA, 2016. Standard farming handbook. 'SORGHUM'. Rural Development Administration, Jeonju, Korea.
- Savallios, A., W. Vermerris, L. Rivera, and G. Ejeta. 2008. Allelic association, chemical characterization and saccharification properties of brown midrib mutants of sorghum (Sorghum bicolor (L.) Moench). Bioenergy Res. 1 : 193-204. https://doi.org/10.1007/s12155-008-9025-7
- Shukla, S., T. J. Felderhoff, A. Saballos, and W. Vermerris. 2017. The relationship between plant height and sugar accumulation in the stems of sweet sorghum (Sorghum bicolor (L.) Moench). Field Crops Res. 203 : 181-191. https://doi.org/10.1016/j.fcr.2016.12.004
- Tang, C. C., C. D. Sun, F. Du, F. Chen, A. Ameen, T. C. Fu, and G. H. Xie. 2018. Effect of plant density on sweet and biomass sorghum production on semiarid marginal land. Sugar Tech. 20(3) : 312-322. https://doi.org/10.1007/s12355-017-0553-3
- Tsuchihashi, N. and Y. Goto. 2008. Year-round cultivation of sweet sorghum (Sorghum bicolor (L.) Moench) through a combination of seed and ratoon cropping in Indonesian Savanna. Plant Prod. Sci. 11(3) : 377-384. https://doi.org/10.1626/pps.11.377
- Turgut, I., U. Bilgili, A. Duman, and E. Acikgoz. 2005. Production of sweet sorghum (Sorghum bicolor (L.) Moench) increases with increased plant densities and nitrogen fertilizer levels. Acta Agric. Scandinavica Section B-Soil and Plant 55(3) : 236-240.
- Wang, R., T. Cheng, and L. Y. Hu. 2015. Effect of wide-narrow row arrangement and plant density on yield and radiation use efficiency of mechanized direct-seeded canola in Central China. Field Crops Res. 172 : 42-52. https://doi.org/10.1016/j.fcr.2014.12.005
- Wortmann, C. S., A. J. Liska, R. B. Ferguson, D. J. Lyon, R. N. Klein, and I. Dewikat. 2010. Dryland performance of sweet sorghum and grain crops for biofuel in Nebraska. Agronomy J. 102(1) : 319-326. https://doi.org/10.2134/agronj2009.0271
- Yang, G. Z., X. J. Luo, Y. C. Nie, and X. L. Zhang. 2014. Effects of plant density on yield and canopy micro environment in hybrid cotton. J. Integrative Agric. 13 : 2154-2163. https://doi.org/10.1016/S2095-3119(13)60727-3
- Yao, H. S., Y. L. Zhang, X. P. Yi, Y. Y. Hu, H. H. Luo, L. Gou, and W. F. Zhang. 2015. Plant density alters nitrogen partitioning among photosynthetic components, leaf photosynthetic capacity and photosynthetic nitrogen use efficiency in field-grown cotton. Field Crops Res. 184 : 39-49. https://doi.org/10.1016/j.fcr.2015.09.005
- Yoshida, S. 1973. Effects of temperature on growth of the rice plant (Oryza sativa L.) in a controlled environment. Soil Sci. Plant Nutr. 19(4) : 299-310. https://doi.org/10.1080/00380768.1973.10432599