Abstract: Based on the data of the observed biomass of summer maize in 1994-2006 in Zhengzhou City, the accumulation and increment distribution of the dry matter from different organs of the single plant in different growth stages were analyzed. The results showed that the dry matter of leaves increased quickly before jointing stage. The ratio of the leaf dry matter took 68%- 88% of the total dry matter of the plant. The dry matter of leaf sheath increased quickly as well with the highest ratio of 20% of the total dry matter of the plant in the jointing stage. The dry matter of the stem reached at the peak in the heading stage with 41% of the total dry matter of the plant. After heading, the dry matter of the ear increased dramatically with 63% of the total dry matter of the plant.

Key words: Summer maize, Summer maize, Biomass, Accumulation, Increment distribution ratio