局部化控对夏玉米冠层结构、光合速率及产量的影响

采用局部化控的方式,应用植物生长调节剂玉黄金塑造了玉米"波浪"型冠层结构,并分析玉黄金对冠层结构、光合速率和产量的影响。结果表明,局部化控处理后化控部分的植株变矮、穗下部节间变短(穗位下降)、穗上部节间变长、基部节间增粗,玉米群体形成"波式"冠层,群体叶面积指数(LAI)增大且持续时间较长,冠层中下部透光条件改善,冠层内叶片保持较高净光合速率,单位面积穗数和粒重增加,表现出比对照明显的增产效果。

Effects of Partial Spraying of Plant Growth Regulator on Canopy Structure, Photosynthetic Rate and Yield of Summer Maize

The effects of partial spraying of plant growth regulator(PGR,brand name: Yu Huangjin),which was sprayed at initial stage of stem elongation at intervals of three lines,were studied on canopy structure,photosynthetic rate and yield characters using a half-compact maize variety.The results showed that the plants sprayed PGR had lower plant heights,shorter lengths of internodes under ear,longer lengths of internodes above ear and thicker diameters of basal stems.Therefore,compared to the control plants,a ’waving’ canopy was shaped in the treatment sprayed PGR partially.It is found that the ’waving’ canopy could obviously improve light permeating conditions in the middle and lower layers,increase leaf area index and hold longer duration,keep higher photosynthetic rate,and result in an increase of the ear number per area,100-grain weight and yield.