Abstract: The length and spatial distribution of leaves of the compact-type maize on the stem forms the shape of a "spindle". In comparison with the spread-type maize, the compact-type has a smaller leaf angle, greater leaf orientation value, better light-reception posture, higher rate of CO2 assimilation, stronger root absorption intensity, and higher activity of the nitrate reductase. It also has the following advantages, vigorous nitrogen metabolism, no early senescence in the later growing stage, fast grain-filling rates, high grain weight, high productivity per plant, and suitability for intensive planting.Selection and extension of the compact-type maize hybrids possessing high photosynthetic efficiency will be the main approach to the higher production of maize.

Key words: Compact-type maize, Plant shape, Leaf orientation value, Productivity per plant