旱地全膜双垄沟播种植对玉米光合生理特性的影响

通过田间试验研究了半干旱区旱地全膜双垄沟播栽培技术对玉米光合生理特性的影响.结果表明,全生育期日平均净光合速率全膜双垄沟播(T4)最高,较其他处理光合能力强,有利于光合物质的形成.说明在干旱半干旱地区玉米全膜双垄沟播(T4)种植能够有效解决光合缺水的问题.全膜双垄沟播(T4)、全膜平作(T3)、全膜双垄沟播+休闲期免耕秸秆覆盖(T6)的光合午休现象较其他处理弱;在玉米抽雄期前全膜双垄沟播(T4)较平作和休闲期免耕处理SPAD高,能够增加玉米功能叶片叶绿素含量,为玉米前期的生长发育及后期的丰产奠定了基础.

Photosynthetic Physiology Characteristics of Rainfed Maize in the System of Completely Mulched Alternating Narrow and Wide Ridges with Furrow Planting

The effects of completely mulched alternating narrow and wide ridges with furrow planting on maize photosynthetic physiology characteristics in semi-arid area was studied using field experiments.The results showed that the average photosynthetic rate of maize in completely mulched alternating narrow and wide ridges with furrow planting treatment(T4) was the highest during the whole growth period,which indicated that the photosynthetic capability of maize in this treatment was higher than that in flat-planting treatment and no-tillage during fallow treatment,and indicated that this planting technology could effectively solve the problem of photosynthetic water in arid and semi-arid areas and was conducive to the formation of maize photosynthetic material.The midday depression of maize in completely mulched alternating narrow and wide ridges with furrow planting treatment(T4),complete mulching and flat-planting treatment(T3),and complete mulching and flat-planting treatment(T6) was weaker than that in other treatments.The SPAD value of maize before corn heading period in completely mulched alternating narrow and wide ridges with furrow planting treatment(T4) was higher than that in flat-planting treatment and no-tillage during fallow treatment,which indicated that this planting technology could increase the chlorophyll content of maize and could lay the foundation for maize early growth and later high yield.