재식밀도가 ‘초롱’ 단수수의 생육 및 수량구성요소에 미치는 영향

This study was conducted to investigate the effect of planting density on plant growth, yield, and quality in the sweet sorghum cultivar ‘Chorong’ (Sorghum bicolor (L.) Moench). Plants were cultivated at densities of 16.7, 11.1, 8.3, 6.7, and 5.6 plants·m -2 . Factors related to yield and yield components were analyzed using correlation and multivariate analyses. There was no significant difference among plant densities in stem length from 20 to 110 days after sowing. But the stem diameter was thin, and a decrease in number of tillers occurred more rapidly as planting density increased. At harvest, juice and sugar yield were higher at densities of 16.7 (42.9, 4.16 Mg·ha -1 , respectively) and 11.1 (37.1, 3.73 Mg·ha -1 ) plants·m -2 than at 8.3 (30.5, 2.96 Mg·ha -1 ), 6.7 (26.6, 2.41 Mg·ha -1 ), and 5.6 (24.7, 2.22 Mg·ha -1 ) plants·m -2 . The soluble solids and total sugar contents were not different among treatments, but relatively high values were observed at the density of 11.1 and 8.3 plants·m -2 . As plant density was increased from 5.6 to 11.1 plants·m -2 , the lodging index (1 = no, 9 = lodging) increased rapidly from 2.00 to 6.33. To determine the optimal planting density, the number of typhoons and topographical characteristics should be considered. Correlation and principal components analyses revealed that plant density exhibited a positive relationship with fresh stem yield (r = 0.62**), dry stem yield (r = 0.58**), juice (r = 0.63**), and sugar yield (r = 0.66**), but a negative with stem diameter (r = -0.65**). The yield factors were not statistically related to stem height, diameter, and number of nodes.