适应甘蔗机械化收获的不同种植行距研究

设置3种不同的种植行距(1.0、1.2、1.4 m),对甘蔗新品种桂糖02-901和桂糖97-69在3种不同种植行距下的出苗率、分蘖率、株高、伸长特性、伸长期光合生理指标以及产量性状进行研究.结果显示:(1)1.4 m种植行距对桂糖02-901和桂糖97-69的出苗率、株高、伸长速度均有促进作用,但却显著降低了分蘖率；(2)在1.2和1.4 m种植行距下,桂糖02-901的叶绿素含量、净光合速率、有效茎数、产量等表现均不如对照(1.0 m行距)；(3)在1.4 m种植行距下,桂糖97-69的叶绿素含量、净光合速率、茎径、产量等表现均优于对照.表明桂糖02-901在宽行距种植下不具有优势,1.0 m行距更能发挥该品种的种性,不适宜作为大中型机械收获的品种使用；桂糖97-69在宽行距种植下具有良好的适应性,1.4 m行距是该品种适应大中型机械收获的适宜行距.

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.