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Publication Date
1981
Description
Sorghum (Sorghum spp.) is usually harvested twice a year in most of Japan but three times a year in southern Japan. Some sorghum plants die after cutting, which leads to low aftermath yield. The purpose of this study was to clarify what cultural factors cause death and what plants die in the sorghum stands. Three field experiments were carried out from 1977 to 1979 to investigate the effect of sowing date, planting density, nitrogen (N) level, and cultivar on mortality rate after cutting. In 1979 the effect of high temperature on mortality was investigated. Information about what plants die was obtained by examining all plants within 1 m2 (2 replications) in the sorghum stands. Plant mortality of sorghum was found to increase when the sorghum was cut at an early growth stage and to be higher as density and N level increased. Mortality among cultivars differed significantly. Regrowth was greater as temperature increased; therefore, high temperature in the field should not cause high mortality. Most dead plants belonged to the lower frequency distributions of plant length, plant yield, and Brix but were higher in N content. Positive correlations were found among plant length, plant yield, and Brix scale reading. N content was found to correlate negatively with these characters. Multiple regression, using yield of regrowth as the dependent variable and plant yield, Brix, and N content as the independent variables, accounted for 92 % of the variation. Linear regression using only plant yield as the independent variable accounted for 90 % of the variation and explained the relation as well as the multiple regression equation.
Citation
Takasaki, Y; Takasaki, Y; and Nojima, H, "Mortality of Sorghum Plants after Cutting" (1981). IGC Proceedings (1981-2023). 8.
(URL: https://uknowledge.uky.edu/igc/1981/section7/8)
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Mortality of Sorghum Plants after Cutting
Sorghum (Sorghum spp.) is usually harvested twice a year in most of Japan but three times a year in southern Japan. Some sorghum plants die after cutting, which leads to low aftermath yield. The purpose of this study was to clarify what cultural factors cause death and what plants die in the sorghum stands. Three field experiments were carried out from 1977 to 1979 to investigate the effect of sowing date, planting density, nitrogen (N) level, and cultivar on mortality rate after cutting. In 1979 the effect of high temperature on mortality was investigated. Information about what plants die was obtained by examining all plants within 1 m2 (2 replications) in the sorghum stands. Plant mortality of sorghum was found to increase when the sorghum was cut at an early growth stage and to be higher as density and N level increased. Mortality among cultivars differed significantly. Regrowth was greater as temperature increased; therefore, high temperature in the field should not cause high mortality. Most dead plants belonged to the lower frequency distributions of plant length, plant yield, and Brix but were higher in N content. Positive correlations were found among plant length, plant yield, and Brix scale reading. N content was found to correlate negatively with these characters. Multiple regression, using yield of regrowth as the dependent variable and plant yield, Brix, and N content as the independent variables, accounted for 92 % of the variation. Linear regression using only plant yield as the independent variable accounted for 90 % of the variation and explained the relation as well as the multiple regression equation.
