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通过氮肥运筹对雨养条件下春玉米叶片光合速率(Pn)、比叶重(SLW)和SPAD值的变化研究表明,吐丝期追施氮肥有助于提高叶片光合速率,延缓后期光合速率的下降。玉米高密度群体比叶重降低。生育前期氮肥施用比例高的处理,后期SLW下降快;吐丝期氮肥施用比例高的处理,生育后期SLW较其他处理有一定优势,并且在高密度下优势更明显。
The results showed that topdressing nitrogen fertilizer at the silking stage could improve the photosynthetic rate of leaves and retard the photosynthetic rate of late maize through the nitrogen fertilizer application on the changes of photosynthetic rate (Pn), specific leaf weight (SLW) and SPAD value of spring maize decline. High density population of corn reduced leaf weight. In the early stage of fertilization, the treatment with high proportion of nitrogen fertilizer applied showed that the SLW decreased rapidly in the late stage. The treatment with high proportion of nitrogen fertilizer in the silking stage had some advantages over the other treatments at the later stage of growth and had more obvious advantages at high density.