氮肥施用量对超高产玉米光合性能及产量的影响

Effects of Nitrogen Application on Photosynthetic Characteristics and Yield in Super High-yield Maize

在田间栽培条件下,研究不同施氮量对玉米植株光合性能及产量的影响。结果表明,增施氮肥能够增加玉米叶片的叶绿素含量、叶面积指数,提高光合速率、蒸腾速率和气孔导度。施用过量的氮肥会造成植株贪青徒长,使生育后期的光合速率、蒸腾速率和气孔导度下降,影响产量。施氮量300 kg/hm2为试验区最适施氮量。

Field experiment was carried on effects of application levels of nitrogen fertilizer on photosynthetic characteristics and yield in maize.The results showed that increasing nitrogen application could increase leaf chlorophyll content,leaf area index,photosynthetic rate,transpiration rate and stomatal conductance.But excessive nitrogen fertilizer caused the plant unfavorable-spindling and decrease photosynthetic rate,transpiration rate and stomatal conductance.The yield reached the highest on condition of nitrogen application amount was 300kg/ha.