Study on different planting row spacing adjust to sugarcane mechanization harvest

We setted up three different planting row spacing (1.0, 1.2, 1.4 m) to study the emergence rate, tillering ability, plant height, elongation characteristic, photosynthetic physiological indexes and yield traits of new sugarcane varieties GT02-901 and GT97-69.The results showed that: (1) 1.4 m planting row spacing treatment could promote the rate of emergence, plant height and the elongation speed of GT02-901 and GT97-69, but reduced the tillering rate significantly. (2) In the 1.4 and 1.2 m planting row spacing treatments,the chlorophyll content, photo, effective stems, yield of GT02-901 were lower than those of CK (1.0 m row spacing). (3) In the 1.4 m planting row spacing treatment, the chlorophyll content, photo, stem diameter, yield of GT97-69 were better than those of CK. GT02-901 didn't have the advantage when planted in wide-row spacing, it could develop its characteristics better in the 1.0 m planting row spacing,so it was not suitable for medium-large machine harvest as variety; GT97-69 was adapted to the wide-row planting. The 1.4 m planting row spacing could be used as the optimal row spacing for medium-large machine harvest.