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以郑单958为供试品种,研究了不同施肥模式对春玉米生育后期冠层结构及光合特性的影响。结果表明:不同施肥模式春玉米穗位、茎粗、茎基第二节节长和各叶位叶绿素含量均为高量施肥模式大于减量施肥模式。减量施肥模式棒三叶上和棒三叶叶倾角均高于高量施肥模式,而棒三叶下叶倾角反之。叶向值则表现为棒三叶和棒三叶上高量施肥模式均大于减量施肥模式,而棒三叶下叶向值与其相反。吐丝期和乳熟期春玉米净光合速率均表现为高量施肥模式高于减量施肥模式。
Taking Zhengdan 958 as test variety, the effects of different fertilization modes on canopy structure and photosynthetic characteristics of spring maize were studied. The results showed that the spike position, the stem diameter, the second node length of the stem base and the chlorophyll content of the leaves were higher in different fertilization modes than in the decreasing fertilization mode. The decrement fertilization pattern was higher than that of the high-rate fertilization pattern on both the three trefoil leaves and the three trefoil leaves, whereas the dip angle of the lower clover leaf was the opposite. The leaf value showed that the high-yield fertilization modes of Clover and Clover were larger than the decrement fertilization mode, while the values of lower leaf of Cane trilobal were the opposite. The net photosynthetic rate of spring maize during silking stage and milky stage were all higher than that of decreasing fertilization mode.