抄録
This study was undertaken to determine the influence of upright leaves, at various populations in two row widths (50 cm and 150 cm); on the light distribution, dry matter production and grain yield of field grown corn (variety Azumayellow). Upright leaves were obtained by mechanically supporting leaves above the first ear node in an elect position since 1 week later from silking time to date of maturity. The results are as follows. 1. At both row widths, the effect of upright leaves on light distribution was seen only at 900 plants/a. 2. In two row widths, upright leaves affected differently on dry matter production at 900 plants/a. The dry matter production was increased in 50 cm row, but decreased in 150 cm row. As a result, optimum population for dry matter production was heightened at 50 cm row and lowered at 150 cm row. 3. The dry matter production increased as LAI increased to 6-7, but no further increases above an LAI of 6-7. And it became advantageous to reduce light extinction coefficient to optimum value by upright leaves with narrow row. 4. Effects of upright leaves on grain yield were similar to that on dry matter production. When leaf angle were compared for best grain yield, upright leaves outyielded the normal by 27% (107 kg/a).
