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This study aims to analyze the effects of plant growth regulator on the chlorophyll fluorescence characteristics and yield of spring maize under different planting densities in Northeast China. ‘Dongnong 253’ was used as the material in this experiment and was planted at the densities of 5, 6, 7 and 8 plants m. The plants were sprayed at the jointing stage with the "Yuhuangjin" plant growth regulator. The results showed that increasing the planting density effectively increased the production of the maize populations, while it led to a decrease in the chlorophyll content, angle between the stem and leaf (ABSL) in the ear leaf, single plant dry weight and photosynthetic efficiency, as well as increases in the plant height, ear height and lodging risk. The application of "Yuhuangjin" decreased the plant height and ear height and increased the dry matter accumulation per plant and lodging resistance, increased the ABSL in the ear leaf, reduced the degree of overshadowing in the prophase, extended the duration of high leaf area index (LAI), delayed the senescence process of the leaf and improved the canopy aeration and transmittance capability. The application of "Yuhuangjin" improved the photosynthetic capacities and maintained higher stable photosynthesis by significantly improving the chlorophyll fluorescence parameters, such as Fv/Fm, Y(II), and qP and decreasing Y(NO) and qN. This study showed that the highest yield was 11428.18 kg ha after the "Yuhuangjin" treatment at the planting density of 7 plants m. This experiment provided theoretical and experimental evidence for the effect of increased production from the use of plant growth regulator and high-density planting cultivation on spring maize in Northeast China.

MAIZE YIELD AND LEAF PHOTOSYNTHETIC CHARACTERISTICS IN RESPONSE TO PLANTING DENSITIES AND APPLICATION OF YUHUANGJIN, AS A NEW PLANT GROWTH REGULATOR