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以4个超高产春玉米品种为试验材料,通过5个密度进行超高产春玉米品种光合生产特性的比较试验。结果表明,超高产春玉米品种不同密度下叶绿素含量在8月17日时最高,8月3日次之,9月30日的叶绿素含量最低;光合速率和蒸腾速率在7月30日前随着生育进程逐渐增加,8月21日之后随着生育期的推进呈逐渐下降趋势;生育后期随着种植密度加大,单株干物质积累量逐渐降低。
Four high-yielding spring maize varieties were used as tested materials to compare the photosynthetic characteristics of super-high-yielding spring maize varieties with five densities. The results showed that the chlorophyll content of super high yielding spring maize varieties at different densities was the highest on August 17, followed by August 3, and the lowest on September 30, while the photosynthetic rate and transpiration rate were the lowest before July 30 The process gradually increased, with the growth period after August 21 showed a gradual downward trend; late growth stage with growing density, plant dry matter accumulation decreased.